ORIGINAL_ARTICLE
Using the Lattice Boltzmann Method for the numerical study of non-fourier conduction with variable thermal conductivity
The lattice Boltzmann method (LBM) was used to analyze two-dimensional (2D) non-Fourier heat conduction with temperature-dependent thermal conductivity. To this end, the evolution of wave-like temperature distributions in a 2D plate was obtained. The temperature distributions along certain parts of the plate, which was subjected to heat generation and constant thermal conductivity conditions, were also derived and compared. The LBM results are in good agreement with those reported in other works. Additionally, the temperature contours at four different times in which steady state conditions can be achieved were analyzed. The results showed that thermal conductivity increased with rising temperature. Given the material’s considerable effectiveness in transferring heat energy under heat generation conditions, the temperature gradient of the plate decreased to a level lower than that observed under constant thermal conductivity.
Keywords: Non-Fourier conduction, lattice Boltzmann method, variable thermal conductivity, constant thermal conductivity, heat generation
https://jhmtr.semnan.ac.ir/article_2697_5ab2efdcc43aa2624dff9f28d262e2ec.pdf
2018-05-01T11:23:20
2021-05-12T11:23:20
1
9
10.22075/jhmtr.2017.1705.1118
Non-Fourier conduction
Lattice Boltzmann method
Variable thermal conductivity
Constant Thermal conductivity
Heat generation
AhmadReza
Rahmati
ar_rahmati@kashanu.ac.ir
true
1
University of Kashan
University of Kashan
University of Kashan
LEAD_AUTHOR
A.
Gheibi
aligheibi90@yahoo.com
true
2
University of Kashan
University of Kashan
University of Kashan
AUTHOR
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1
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[3] D.W. Tang, N. Araki, Non-Fourier heat conduction behavior in finite mediums under pulse surface heating, Mater. Sci. Eng, A 292, 173–178, (2000).
3
[4] J.R. Ho, C.P. Kuo, W.S. Jiaung, C.J. Twu, Lattice Boltzmann scheme for hyperbolic heat conduction, Numer. Heat Transfer, B 41, 591–607, (2002).
4
[5] S.C. Mishra, A. Lankadasu, K. Beronov, Application of the lattice Boltzmann method for solving the energy equation of a 2-D transient conduction radiation problem, Int. J. Heat Mass Transfer, 48, 3648–3659, (2005).
5
[6] S.C. Mishra, H.K. Roy, Solving transient conduction-radiation problems using the lattice Boltzmann method and the finite volume method, J. Compute. Phys. 233, 89–107, (2007).
6
[7] M. H. Rahimian, I. Rahbari, F. Mortazavi, High order numerical simulation of non-Fourier heat conduction: An application of numerical Laplace transform inversion, International Journal of Heat and Mass Transfer, vol. 51, 51–58, (2014).
7
[8] W. Dreyer, S. Qamar, Kinetic flux-vector splitting schemes for the hyperbolic heat conduction, J. Comput. Phys. 198 (2), (2004).
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[9] H. Chen, J. Lin, Numerical analysis for hyperbolic heat conduction, Int. J. Heat Mass Transfer 36 (11), 2891–2898, (1993).
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[10] J.I. Frankel, B. Vick, M.N. Özisik, General formulation and analysis of hyperbolic heat conduction in composite media, Int. J. Heat Mass Transfer 30, 1293–1305, (1987).
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[11] B. Abdel-Hamid, Modelling non-Fourier heat conduction with periodic thermal oscillation using the finite integral transform, Appl. Math, Model 23, 899–914, (1999).
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[12] T.M. Chen, C.C. Chen, Numerical solution for the hyperbolic heat conduction problems in the radial–spherical coordinate system using a hybrid Green’s function method, Int. J. Therm. Sci. 49, 1193–1196, (2010).
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[13] X. Lu, P. Tervola, M. Viljanen, Transient analytical solution to heat conduction in composite circular cylinder, Int. J. Heat Mass Transfer, 49, 341–348, (2006).
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[14] G.E. Cossali, Periodic heat conduction in a solid homogeneous finite cylinder, Int. J. Therm. Sci. 48, 722–732, (2009).
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[15] A. Moosaie, Axsymmetric non-Fourier temperature field in a hollow sphere, Arch. Appl. Mech. 79, 679–694, (2009).
15
[16] H. Ahmadikia and M. Rismanian, Analytical solution of non-Fourier heat conduction problem on a fin under periodic boundary conditions, Journal of Mechanical Science and Technology, vol. 25 (11) 2919-2926, (2011).
16
[17] R. Siegel, J. Howell, Thermal Radiation heat Transfer, Taylor & Francis: New York, (2002).
17
[18] C. Mishra, H. Sahai, Analyses of non-Fourier heat conduction in 1-D cylindrical ans spherical geometry- An application of the lattice Boltzmann method, International Journal of Heat and Mass Transfer, 55, 7015-7023, (2012).
18
[19] Q. Zou, S. Hou, G. D. Doolen, Analytical solutions of the lattice Boltzmann BGK model, Journal of Statistical Physics, vol(81), 319–334, (1995).
19
[20] P. Lallemand, L. S. Luo, heory of the lattice Boltzmann method-acoustic and thermal properties in two and three dimensions, Physical Review, E68, (036706), 1–25, (2003).
20
[21] T. M. Chen, C. C. Chen, Numerical solution for the hyperbolic heat conduction problems in the radial-spherical coordinate system using a hybrid Green’s function method, International Journal of Thermal Sciences, (2010).
21
[22] C. C. Wang, Direct and inverse solutions with non-Fourier effect on the irregular shape, International Journal of Heat and Mass Transfer, vol (53), (13-14), 2685–2693, (2010).
22
[23] C. Mishra, B. Mondal, T. Kush, B. Sima Rama Krishna, Solving transient heat conduction problems on uniform and non-uniform lattices using the lattice Boltzmann method, International Communications in Heat and Mass Transfer, vol(36), 322–328, (2009).
23
ORIGINAL_ARTICLE
A numerical investigation of heat transfer and pressure drop in a novel cylindrical heat sink with helical minichannels
This study numerically investigated heat transfer and fluid flow characteristics in a novel cylindrical heat sink with helical minichannels for the laminar flow of fluid with temperature-dependent properties. A finite volume method was employed to obtain the solution of governing equations. The effects of helical angle, channel aspect ratio, and Reynolds number, which were regarded as main parameters, were determined. The overall performance of the heat sink was also analyzed on the basis of the thermal performance factor and the augmentation entropy generation number. Results showed that a decrease in the channel helix angle and an increase in the channel aspect ratio and Reynolds number enhance the average heat transfer coefficient and pressure drop in the heat sink. The thermal performance factor and entropy generation minimization method revealed that an aspect ratio of 1.2 enables the best heat sink performance at all helix angles. When the helix angle decreases, performance increases, especially at low aspect ratios.
https://jhmtr.semnan.ac.ir/article_2580_08677c9f4be05c35ecea551e243b5ce0.pdf
2018-05-01T11:23:20
2021-05-12T11:23:20
11
26
10.22075/jhmtr.2017.11247.1159
Cylindrical helical minichannels heat sink
Thermal performance factor
Thermal resistance
Entropy Generation
Channel aspect ratio
Alireza
Falahat
a_r_falahat@yahoo.com
true
1
Department of Mechanical Engineering,Shahid Chamran University of Ahvaz,Ahvaz, Iran
Department of Mechanical Engineering,Shahid Chamran University of Ahvaz,Ahvaz, Iran
Department of Mechanical Engineering,Shahid Chamran University of Ahvaz,Ahvaz, Iran
AUTHOR
Reza
Bahoosh
reza.bahoosh@gmail.com
true
2
Department of Mechanical Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran
Department of Mechanical Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran
Department of Mechanical Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran
LEAD_AUTHOR
Aminreza
Noghrehabadi
noghrehabadi@scu.ac.ir
true
3
Department of Mechanical Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran
Department of Mechanical Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran
Department of Mechanical Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran
AUTHOR
[1]. Y. Fan, P. Seng Lee, B. Wah Chua, Investigation on the influence of edge effect on flow and temperature uniformities in cylindrical oblique-finned minichannel array, International Journal of Heat and Mass Transfer, 70, 651–663, (2014).
1
[2]. D.B. Tuckerman, R.F.W. Pease, High-performance heat sinking for VLSI, IEEE Electron Device Letters, 2 (5), 126-129, (1981).
2
[3]. W. Qu, I. Mudawar, Experimental and Numerical Study of Pressure Drop and Heat Transfer in a Single-Phase Microchannel Heat Sink, International Journal of Heat and Mass Transfer, 45(12) 2549–2565, (2002).
3
[4]. X.L. Xie, Z.J. Liu, Y.L. He, W.Q. Tao, Numerical study of laminar heat transfer and pressure drop characteristics in a water-cooled minichannel heat sink, Applied Thermal Engineering, 29 (1), 64–74, (2009).
4
[5]. Y. Sui, C.J. Teo, P.S. Lee, Y.T. Chew, C. Shu, Fluid flow and heat transfer in wavy microchannels, International Journal of Heat and Mass Transfer, 53 (13-14), 2760–2772, (2010).
5
[6]. H.A. Mohammed, P. Gunnasegaran, N.H. Shuaib, Influence of channel shape on the thermal and hydraulic performance of microchannel heat sink, International Communications in Heat and Mass Transfer, 38 (4), 474–480, (2011).
6
[7]. H.A. Mohammed, P. Gunnasegaran, N.H. Shuaib, Numerical simulation of heat transfer enhancement in wavy microchannel heat sink, International Communications in Heat and Mass Transfer, 38 (1) 63–68, (2011).
7
[8]. Y. J. Lee, P. S. Lee, S. K. Chou, Numerical Study of Fluid Flow and Heat Transfer in the Enhanced Microchannel With Oblique Fins, Journal of Heat Transfer, 135 (4), 041901-0419010, (2013).
8
[9]. L. Chai, G.D. Xia, H. S. Wang, Parametric study on thermal and hydraulic characteristics of laminar flow in microchannel heat sink with fan-shaped ribs on sidewalls– Part 1: Heat transfer, International Journal of Heat and Mass Transfer, 97, 1069–1080, (2016).
9
[10]. G. Xie, Y. Li, F. Zhang, B. Sunden, Analysis of micro-channel heat sinks with rectangular-shaped flow obstructions, NUMERICAL HEAT TRANSFER, 69 (4), 1–17, (2016).
10
[11]. X. W. Zhu, Y. H. Fu, J. Q. Zhao, L. Zhu, Three-dimensional numerical study of the laminar flow and heat transfer in a wavy-finned heat sink filled with AL2O3/ethylene glycol-water nanofluid, NUMERICAL HEAT TRANSFER, 69 (2), 1–14, (2015).
11
[12]. M. Bovand, S. Rashidi, J.A. Esfahani, Heat transfer enhancement and pressure drop penalty in porous solar heaters: Numerical simulations, Solar Energy, 123, 145–159, (2016).
12
[13]. M. Bashi, S. Rashidi, J.A. Esfahani, Exergy analysis for a plate-ﬁn triangular duct enhanced by a porous material, Applied Thermal Engineering, 110, 1448-1461, (2017).
13
[14]. S. Rashidi, N. Moghadas Zade, J. Abolfazli Esfahani, Thermo-fluid performance and entropy generation analysis for a new eccentric helical screw tape insert in a 3D tube, Chemical Engineering and Processing: Process Intensification, 117, 27-37, (2017).
14
[15]. S. Rashidi, M. Akbarzadeh, R. Masoodi, E.M. Languri, Thermal-hydraulic and entropy generation analysis for turbulent flow inside a corrugated channel, International Journal of Heat and Mass Transfer, 109, 812-823, (2017).
15
[16]. C.J. Ho, L.C. Wei, Z.W. Li, An experimental investigation of forced convective cooling performance of a microchannel heat sink with Al2O3/water nanofluid, Applied Thermal Engineering, 30 (2-3), 96–103, (2010).
16
[17]. Y. J. Lee, P. K. Singh, P. S. Lee, Fluid flow and heat transfer investigations on enhanced microchannel heat sink using oblique fins with parametric study, International Journal of Heat and Mass Transfer, 81, 325–336, (2015).
17
[18]. B. Rimbault , C. T. Nguyen , N. Galanis, Experimental investigation of CuO-water nanofluid flow and heat transfer inside a microchannel heat sink, International Journal of Thermal Sciences, 84, 275-292, (2014).
18
[19]. H. Zirakzadeh, A.R. Mashayekh,H. Noori Bidgoli, M. Ashjaee, Exprimental investigation of heat transfer in a novel heat sink by means of alumina nanofluids, Heat Transfer Research, 43(8), 709–720, (2012).
19
[20]. Y.J. Lee, P.S. Lee, S.K. Chou, Enhanced Thermal Transport in Microchannel Using Oblique Fins, Journal of Heat Transfer, 134 (10), 101901, (2012).
20
[21]. S.M. Peyghambarzadeh, S.H. Hashemabadi, A.R. Chabi, M. Salimi, Performance of water based CuO and Al2O3 nanofluids in a Cu–Be alloy heat sink with rectangular microchannels, Energy Conversion and Management, 86, 28–38, (2014).
21
[22]. M. Khoshvaght-Aliabadi, F. Nozan, Water cooled corrugated minichannel heat sink for electronic devices: Effect of corrugation shape, International Communications in Heat and Mass Transfer, 76, 188–196, (2016).
22
[23]. Y. Fan, P. S. Lee, L.W. Jin, B. W. Chua, A simulation and experimental study of fluid flow and heat transfer on cylindrical oblique-finned heat sink, International Journal of Heat and Mass Transfer, 61 (1), 62–72, (2013).
23
[24]. Y. Fan, P. S. Lee, L.W. Jin, B. W. Chua, Experimental investigation on heat transfer and pressure drop of a novel cylindrical oblique fin heat sink, International Journal of Thermal Sciences, 76, 1-10, (2014).
24
[25]. Z. Azizi, A. Alamdari, M.R. Malayeri, Convective heat transfer of Cu–water nanofluid in a cylindrical microchannel heat sink, Energy Conversion and Management, 101, 515–524, (2015).
25
[26]. Z. Azizi, A. Alamdari, M.R. Malayeri, Thermal performance and friction factor of a cylindrical microchannel heat sink cooled by Cu-water nanofluid, Applied Thermal Engineering 99, 970–978, (2016).
26
[27]. B. Xu., K. T, Ooi., C. Mavriplis., M. E. Zaghloul, Evaluation of viscous dissipation in liquid flow in microchannels, Journal of Micromechanics and Microengineering, 13(1), 53-57,(2002).
27
[28]. L. Chai, G. Xia, M. Zhou, J. Li, J. Qi, Optimum thermal design of interrupted microchannel heat sink with rectangular ribs in the transverse microchambers, Applied Thermal Engineering, 51, 880–889, (2013).
28
M. Adham, N. Mohd-Ghazali, R. Ahmad, Performance Optimization of a Microchannel Heat Sink Using the Improved Strength Pareto Evolutionary Algorithm (SPEA2), Journal of Engineering Thermophysics, 24 (1), 86–100, (2015).
29
[29]. Y.T. Yang, H.Sen Peng, Numerical Study of Thermal and Hydraulic Performance of Compound Heat Sink, Numerical Heat Transfer, 55 (5), 432–447, (2009).
30
[30]. G. Xie, Zh. Chen, B. Sunden,W. Zhang, Numerical Predictions of the Flow and Thermal Performance of Water-Cooled Single-Layer and Double-Layer Wavy Microchannel Heat Sinks, Numerical Heat Transfer, 63 (3), 201–225, (2013).
31
[31]. H. Wang, Zh. Chen, J. Gao, Influence of geometric parameters on flow and heat transfer performance of micro-channel heat sinks, Applied Thermal Engineering, 107, 870–879, (2016).
32
[32]. M. Khoshvaght-Aliabadi, A. Alizadeh, An experimental study of Cu–water nanofluid flow inside serpentine tubes with variable straight-section lengths, Experimental Thermal Fluid Science, 61, 1–11, (2015).
33
[33]. Y. Yue, Sh. K. Mohammadian, Y. Zhang, Analysis of performances of a manifold microchannel heat sink with nanofluids, International Journal of Thermal Sciences, 89, 305-313, (2015).
34
[34]. L. Chai, G.D. Xia, H.S. Wang, Parametric study on thermal and hydraulic characteristics of laminar flow in microchannel heat sink with fan-shaped ribs on sidewalls – Part 3: performance evaluation, International Journal of Heat and Mass Transfer, 97, 1091–1101, (2016).
35
Ebrahimi, F. Rikhtegar, A. Sabaghan, E. Roohi, Heat transfer and entropy generation in a microchannel with longitudinal vortex generators using nanofluids, Energy, 101, 190-201, (2016).
36
[35]. G. D. Xai, Y.L. Zhia, Z.Z. Cui, Characteristics of entropy generation and heat transfer in a microchannel with fan-shaped reentrant cavities and internal ribs, Science China Technological Sciences, 56 (7), 1629–1635, (2013).
37
[36]. D.D. Ma, G.D. Xia, Y.F. Li, Y.T. Jia, J. Wang, Effects of structural parameters on fluid flow and heat transfer characteristics in microchannel with offset zigzag grooves in sidewall, International Journal of Heat and Mass Transfer, 101, 427–435, (2016).
38
[37]. L. Chai, G. Xia, L. Wang, M. Zhou, Z. Cui, Heat transfer enhancement in microchannel heat sinks with periodic expansion–constriction cross-sections, International Journal of Heat and Mass Transfer, 62 (1), 741-751, (2013).
39
ORIGINAL_ARTICLE
Computational fluid dynamics simulation of the flow patterns and performance of conventional and dual-cone gas-particle cyclones
One of the main concerns of researchers is the separation of suspended particles in a fluid. Accordingly, the current study numerically investigated the effects of a conical section on the flow pattern of a Stairmand cyclone by simulating single-cone and dual-cone cyclones. A turbulence model was used to analyze incompressible gas-particle flow in the cyclone models, and the Eulerian–Lagrangian approach was employed to examine particle movement. Despite the simplicity of cyclone geometry, internal two-phase flow in such devices is very complicated and anisotropic. This flow was therefore analyzed using a Reynolds stress model. The numerical results were then compared with those of experimental studies. To track calcium carbonate particles, drag and gravity forces were considered in the Lagrangian model. The findings indicated that adding a second conical section at the bottom of the cyclones increases tangential velocity and expands the Rankine vortex region. Moreover, an increasing trend of descending flow occurs. Increasing the number of conical sections elevates pressure drop at all velocities. Finally, the dual-cone cyclone has higher efficiency than the typical cyclone because the smaller end of the former limits particle motion and increases collection performance.
https://jhmtr.semnan.ac.ir/article_2649_53aed4c73c914e61b6fbe405cd293946.pdf
2018-05-01T11:23:20
2021-05-12T11:23:20
27
38
10.22075/jhmtr.2017.11918.1170
Eulerian-Lagrangian
Reynolds Stress Model
turbulent flow
Gas-Particle flow
Seyed Masoud
Vahedi
m.vahedi@semnan.ac.ir
true
1
Faculty of Mechanical Engineering, Semnan University, Semnan, Iran
Faculty of Mechanical Engineering, Semnan University, Semnan, Iran
Faculty of Mechanical Engineering, Semnan University, Semnan, Iran
AUTHOR
Farzad
Parvaz
f.parvaz@semnan.ac.ir
true
2
Faculty of Mechanical Engineering, Semnan University, Semnan, Iran
Faculty of Mechanical Engineering, Semnan University, Semnan, Iran
Faculty of Mechanical Engineering, Semnan University, Semnan, Iran
LEAD_AUTHOR
Roohollah
Rafee
rafee@semnan.ac.ir
true
3
Faculty of Mechanical Engineering, Semnan University, Semnan, Iran
Faculty of Mechanical Engineering, Semnan University, Semnan, Iran
Faculty of Mechanical Engineering, Semnan University, Semnan, Iran
AUTHOR
Mohsen
Khandan Bakavoli
mkhandan@semnan.ac.ir
true
4
Faculty of Mechanical Engineering, Semnan University, Semnan, Iran
Faculty of Mechanical Engineering, Semnan University, Semnan, Iran
Faculty of Mechanical Engineering, Semnan University, Semnan, Iran
AUTHOR
[1] C.B. Shephered, C.E. Lapple, Flow pattern and pressure drop in cyclone dust collectors, Industrial & Engineering Chemistry, 31(8), 972-984, (1939).
1
[2] W. Barth, L. Leineweber, Evaluation of design of cyclone separators, Staub Reinhalt. Luft, 24, 41-55, (1964).
2
[3] H. Mothes, F. Löffler, Prediction of particle removal in cyclone separators, International Journal of Chemical Engineering, 28(2), 231-240, (1988).
3
[4] D.L. Iozia, D. Leith, The logistic function and cyclone fractional efficiency, Aerosol Science and Technology, 12(3), 598-606, (1990).
4
[5] A. Avci, I. Karagoz, Effects of flow and geometrical parameters on the collection efficiency in cyclone separators, Journal of Aerosol Science, 34(7), 937-955, (2003).
5
[6] W. Barth, Berechnung und auslegung von zyklonabscheidern auf grund neuerer untersuchungen, Brennstoff-Wärme-Kraft, 8(1), 1-9, (1956).
6
[7] E. Muschelknautz, W. Krambrock, Aerodynamische Beiwerte des Zyklonabscheiders aufgrund neuer und verbesserter Messungen, Chemie Ingenieur Technik, 42(5), 247-255, (1970).
7
[8] P. Meißner, F. Löffler, Zur berechnung des strömungsfeldes im zyklonabscheider, Chemie Ingenieur Technik, 50(6), 451-471, (1978).
8
[9] I. Karagoz, A. Avci, Modelling of the pressure drop in tangential inlet cyclone separators. Aerosol Science and Technology, 39(9), 857-865, (2005).
9
[10] A.C. Hoffmann, M. De Groot, W. Peng, H.W.A. Dries, J. Kater, Advantages and risks in increasing cyclone separator length, AIChE journal, 47(11), 2452-2460, (2001).
10
[11] Y. Zhu, K.W. Lee, Experimental study on small cyclones operating at high flowrates. Journal of Aerosol Science, 30(10), 1303-1315, (1999).
11
[12] F. Kaya, I. Karagoz, A. Avci, Effects of surface roughness on the performance of tangential inlet cyclone separators. Aerosol science and technology, 45(8), 988-995, (2011).
12
[13] B. Wang, D.L. Xu, K.W. Chu, A.B. Yu, Numerical study of gas–solid flow in a cyclone separator. Applied Mathematical Modelling, 30(11), 1326-1342, (2006).
13
[14] L. Shi, D.J. Bayless, Comparison of boundary conditions for predicting the collection efficiency of cyclones. Powder Technology, 173(1), 29-37, (2007).
14
[15] A. Raoufi, M. Shams, M. Farzaneh, R. Ebrahimi, Numerical simulation and optimization of fluid flow in cyclone vortex finder. Chemical Engineering and Processing: Process Intensification, 47(1), 128-137, (2008).
15
[16] A. Kępa, Division of outlet flow in a cyclone vortex finder—The CFD calculations. Separation and Purification Technology, 75(2), 127-131, (2010).
16
[17] K. Elsayed, C. Lacor, The effect of cyclone inlet dimensions on the flow pattern and performance, Applied Mathematical Modelling, 35(4), 1952–1968, (2011).
17
[18] B. Zhao, Y. Su, J. Zhang, Simulation of Gas Flow Pattern and Separation Efficiency in Cyclone with Conventional Single and Spiral Double Inlet Configuration, Chemical Engineering Research and Design, 84(12), 1158–1165, (2006).
18
[19] T. G. Chuah, J. Gimbun, T. S. Y. Choong, A CFD study of the effect of cone dimensions on sampling aerocyclones performance and hydrodynamics, Powder Technology, 162, 126–132, (2006).
19
[20] R. Xiang, S. H. Park, K. W. Lee, Effects of cone dimension on cyclone performance, Journal of Aerosol Science, 32(4), 549–561, (2001). [21] F. Kaya, I. Karagoz, Numerical investigation of performance characteristics of a cyclone prolonged with a dipleg, Chemical Engineering Journal, 151(1), 39–45, (2009).
20
[22] F. Qian, J. Zhang, M. Zhang, Effects of the prolonged vertical tube on the separation performance of a cyclone, Journal of hazardous materials, 136, 822–829, (2006).
21
[23] H. Yoshida, Y. Nishimura, K. Fukui, T. Yamamoto, Effect of apex cone shape on fine particle classification of gas-cyclone, Powder Technology, 204(1), 54–62, (2010).
22
[24] A.J. Hoekstra, Gas flow field and collection efficiency of cyclone separators, Ph.D. thesis, Technical University Delft, Netherland, (2000).
23
[25] F. Parvaz, S.H. Hosseini, G. Ahmadi, Kh. Elsayed, Impacts of the Vortex Finder Eccentricity on the Flow Pattern and Performance of a Gas Cyclone, Separation and Purification Technology, 187, 1-13, (2017).
24
[26] B. Zhao, Development of a new method for evaluating cyclone efficiency, Chemical Engineering and Processing: Process Intensification, 44, 447–451 (2005).
25
[27] J. Gimbun, CFD simulation of aerocyclone hydrodynamics and performance at extreme temperature, Engineering Applications of Computational Fluid Mechanics, 2(1), 22-29 (2008).
26
[28] Y. Su, A.Zheng, B. Zhao, Numerical simulation of effect of inlet configuration on square cyclone separator performance, Powder technology, 210(3), 293-303 (2011).
27
[29] N. Fathizadeh, A. Mohebbi, S. Soltaninejad, M. Iranmanesh, Design and simulation of high pressure cyclones for a gas city gate station using semi-empirical models, genetic algorithm and computational fluid dynamics. Journal of Natural Gas Science and Engineering, 26, 313-329 (2015).
28
[30] L.S. Brar, R.P. Sharma, K. Elsayed, The effect of the cyclone length on the performance of Stairmand high-efficiency cyclone, Powder Technology, 286, 668-677 (2015).
29
[31] X. Gao, J. Chen, J. Feng, X. Peng, Numerical investigation of the effects of the central channel on the flow field in an oil–gas cyclone separator, Computers & Fluids, 92, 45-55 (2014).
30
[32] Ansys FLUENT 16 user guide. , Fluent Inc., 2006.
31
[33] A. C. Hoffmann and L. E. Stein. Gas cyclones and swirl tubes: Principle, Design and Operation. Springer, 2nd edition, 2008.
32
ORIGINAL_ARTICLE
Numerical study of a combined convection flow in a cavity filled with nanofluid considering effects of diameter of nanoparticles and cavity inclination angles
The present paper focuses on problem of mixed convection fluid flow and heat transfer of Al2O3-water nanofluid with temperature and nanoparticles concentration dependent thermal conductivity and effective viscosity inside Lid-driven cavity having a hot rectangular obstacle. The governing equations are discretized using the finite volume method while the SIMPLER algorithm is employed to couple velocity and pressure fields. Using the developed code, the effects of cavity inclination angle, diameter and solid volume fraction of the Al2O3 nanoparticles on the flow and thermal fields and heat transfer inside the cavity are studied. The results show that at all solid volume fraction the average Nusselt number has inverse relationship with nanoparticles diameter. Also the results have clearly indicated that with increasing slope of the cavity to 90 degree, heat transfer continuously decreases at all studied Richardson numbers© 2017 Published by Semnan University Press. All rights reserved.
https://jhmtr.semnan.ac.ir/article_428_c92e2216d95dfb6b85e101985caa02e5.pdf
2018-05-01T11:23:20
2021-05-12T11:23:20
39
49
10.22075/jhmtr.2016.428
Nanofluid
Variable properties
Solid volume fraction
lid-driven cavity
Diameter of nanoparticles
Mohammad
Hemmat Esfe
m.hemmatesfe@gmail.com
true
1
Semnan University
Semnan University
Semnan University
LEAD_AUTHOR
Seyfolah
Saedodin
true
2
Semnan University
Semnan University
Semnan University
AUTHOR
[1]. Choi, S.U.S.(1995) Enhancing thermal conductivity of fluids with nanoparticles, developments and applications of non-Newtonian flows, in: D.A. Siginer, H.P. Wang (Eds.), FEDvol. 231/MDvol. 66, The American Society of Mechanical Engineers, New York, 99-105.
1
[2]. Xuan, Y., Li, Q., (2003). Investigation on convective heat transfer and flow features of nanofluids. Journal of Heat Transfer, 125, 151–155.
2
[3]. Lee, S., Choi, S.U.S., Li, S., & Eastman, J.A. Measuring Thermal Conductivity of Fluids Containing Oxide Nanoparticles". International Journal of Heat and Mass Transfer,.121, 280-289.
3
[4]. Xie, H.Q., Wang, J.C., Xi, T.G., Li, Y., & Ai, F., (2002). Dependence of the thermal conductivity of nanoparticle–fluid mixture on the base fluid. J. Mat. Sci. Let., 21, 1469–1471.
4
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33
ORIGINAL_ARTICLE
Characterization of unsteady double-diffusive mixed convection flow with soret and dufour effects in a square enclosure with top moving lid
The present study considers the numerical examination of an unsteady thermo-solutal mixed convection when the extra mass and heat diffusions, called as Soret and Dufour effects, were not neglected. The numerical simulations were performed in a lid-driven cavity, where the horizontal walls were kept in constant temperatures and concentrations. The vertical walls were well insulated. A finite volume method based on SIMPLE algorithm was utilized to solve the coupled governing equations. Numerical simulations are performed for wide combinations of Soret and Duofour coefficients and are given by streamlines, isotherms, isoconcentrations, fluid velocities, average Nusselt and Sherwood numbers. The influences of pertinent parameters on the various heat transfer modes, i.e. convective and conductive modes, as well as the total kinematic energy of the studied thermo-solutal system are also analyzed.
Results demonstrate that Soret and Dufour effects insignificantly influence the fluid flow and transport phenomena when flow is affected to some extent by the forced convection. It is also achieved that the extra heat diffusion, Dufour effect, affects heat transfer by creating thermal eddies especially when flow is dominated by the natural convection. Besides, the conductive mode of heat transfer is attenuated by Dufour coefficient.
https://jhmtr.semnan.ac.ir/article_2261_70dd2e6303b41b2dfc96f3773a3ed419.pdf
2018-05-01T11:23:20
2021-05-12T11:23:20
51
68
10.22075/jhmtr.2017.880.1062
Double-diffusive convection
Soret and Dufour effects
Heat and mass transfer
Conduction
Omid
Ghaffarpasand
o.ghaffarpasand@gmail.com
true
1
University of Isfahan, Iran
University of Isfahan, Iran
University of Isfahan, Iran
LEAD_AUTHOR
[1]. R.W. Schmit, “Double diffusion in oceanography,” Annual Review of Fluid Mech, 26, 255–265, (1994).
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2
[3]. P.K. Bose, D. Sen, R. Panua, A.K. Das, “Numerical analysis of laminar natural convection in a quadrantal cavity with a solid adiabatic fin attached to the hot vertical wall. Journal of. Applied Fluid Mechanica, 6, 501-510, (2013).
3
[4]. A.A. Abbasian Arani, M. Mahmoodi, S. Mazrouei Sebdani, “On the cooling process of nanofluid in a square enclosure with linear temperature distribution on left wall,” Journal of. Applied Fluid Mechanica, 7, 591-601, (2014).
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[5]. J.Serrano-Arellano, J. Xama`n, G. A`lvarez, “Optimum ventilation based on the ventilation effectiveness for temperature and distribution in ventilated cavities,” International Journal of Heat and Mass Transfer, 62, 9–21, (2013).
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[6]. S. Bettaibi, F., Kuznik, E. Sediki, “Hybrid LBM-MRT model coupled with finite difference method for double-diffusive mixed convection in rectangular enclosure with insulated moving lid,” Physica A: Statistical Mechanics and its Applications, 444, 311-326, (2016).
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[7]. A.M. Aly, “Double-diffusive natural convection in an enclosure including/excluding sloshing rod using a stabilized ISPH method,” International Communications in Heat and Mass Transfer, 73, 84-99, (2016).
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[18]. M. Bhuvaneswari, S. Sivasankaran, Y.J. Kim, “Numerical study on double-diffusive mixed convection with a Soret effect in a two-sided lid-driven cavity,” Numerical Heat Transfer A, 59, 543–560, (2011).
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[21]. Gh.R. Kefayati, “Simulation of double diffusive natural convection and entropy generation of power-law fluids in an inclined porous cavity with Soret and Dufour effects (Part I: Study of fluid flow, heat and mass transfer),” International Journal of Heat and Mass Transfer, 94, 539–581, (2016).
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32
ORIGINAL_ARTICLE
Three-dimensional numerical simulation of temperature and flow fields in a Czochralski growth of germanium
For a Czochralski growth of Ge crystal, thermal fields have been analysed numerically using the three-dimensional finite volume method (FLUENT package). The arrangement used in a real Czochralski crystal growth lab included a graphite crucible, heat shield, heating device, thermal insulation and chamber including two gas outlets. We have considered two cases for calculations, which are configuration containing (a) only gas and (b) melt and gas, related to initial stages of the growth process (seeding process). It has been assumed that the growth system is in steady state, fluids are incompressible Newtonian fluids and the flow is laminar. It was shown that the thermal field in the growth setup is completely three-dimensional. Especially, the temperature field at the melt free surface has not a uniform radial distribution due to the three-dimensional orientation of Argon flow above it.
https://jhmtr.semnan.ac.ir/article_2751_fbb14d42b433ae14cd24f269b06a8af6.pdf
2018-05-01T11:23:20
2021-05-12T11:23:20
69
77
10.22075/jhmtr.2017.1208.1087
Computer simulation
Fluid flow
Heat transfer
Czochralski method
M.H.
Tavakoli
mhtvkl@gmail.com
true
1
Physics Department, Bu-Ali Sina University
Physics Department, Bu-Ali Sina University
Physics Department, Bu-Ali Sina University
LEAD_AUTHOR
Zahra
Taheri Ghahfarokhi
z.ttaheri@yahoo.com
true
2
Physics Department, Bu-Ali Sina University
Physics Department, Bu-Ali Sina University
Physics Department, Bu-Ali Sina University
AUTHOR
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ORIGINAL_ARTICLE
Two-dimensional Simulation of Mass Transfer and Nano-Particle Deposition of Cigarette Smoke in a Human Airway
The chance of developing lung cancer is increased through being exposed to cigarette smoke illustrated by studies. It is vital to understand the development of particular histologic-type cancers regarding the deposition of carcinogenic particles, which are present in human airway. In this paper, the mass transfer and deposition of cigarette smoke, inside the human airway, are investigated applying the finite element method. The mass transfer and depositions of four types of critical cigarette smoke, namely 1, 3-butadiene, acrolein, acetaldehyde and carbon monoxide (CO), in a complete human-airway model (from mouth to B3 generation), under inhalation conditions, have been simulated. In this study, concentration distribution in inhalation is evaluated. The vapour deposition was modelled with 30 and 80 L.min-1 volumetric flow rates. Therefore, a two-dimensional model of human airway from the mouth to generation B3 was reconstructed. Then, for simulating the mass transfers and deposition fraction, the low-Reynolds-number (LRN) k–ω turbulence equation was used.
https://jhmtr.semnan.ac.ir/article_2710_a9c0f194c7c7ae18a0e533cd84ff9cc1.pdf
2018-05-01T11:23:20
2021-05-12T11:23:20
79
85
10.22075/jhmtr.2017.1751.1128
Lung airway
Cigarette smoke
Nano-particle
Mass transfers
Deposition
masoud
khajenoori
masoud.khajenoori@semnan.ac.ir
true
1
semnan university
semnan university
semnan university
AUTHOR
Ali
Haghighi Asl
ahaghighi@semnan.ac.ir
true
2
Semnan University
Semnan University
Semnan University
LEAD_AUTHOR
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