Improvement of Energy, Exergy Efficiency and PEC Index in a Heat Exchanger Equipped with Turbulators under the Effect of a Magnetic Field

Document Type : Full Length Research Article

Authors

Faculty of Mechanical Engineering, University of Kashan, Kashan, Iran

Abstract

A double-tube heat exchanger equipped with vortex generators is simulated under the influence of a magnetic field. The internal tube of this heat exchanger is equipped with blade-type vortex generators with various geometrical shapes. A magnetic field is employed to enhance thermal efficiency in the double-tube heat exchanger, with Hartmann numbers ranging from 35 to 155. The applied hybrid nanofluid is composed of Syltherm 800, iron oxide, and graphene oxide at volume fractions (φ) of 0, 1.75, and 3.75%. The study is conducted under steady-state conditions using a two-phase model with Reynolds number ranging from 25,000 to 55,000, utilizing the k-epsilon turbulence model. The results indicate that as the Re increases, the convective heat transfer coefficient rises. The maximum increase in the Nusselt number is observed in the heat exchanger equipped with vortex generators of Sample 3, whereas the minimum value occurs in the bare heat exchanger. Additionally, as the Hartmann number increases from 35 to 155, the exergy efficiency also rises. Exergy efficiency increases with Reynolds number up to 35,000 and then decreases. It is also found that the application of a magnetic field maximizes the exergy efficiency at a Re of 35,000 and Hartmann number of 155 for the heat exchanger equipped with Sample 3 vortex generators.

Keywords

Main Subjects

References

[1]   Bayat, J. Nikseresht, A.H., 2012. Thermal performance and pressure drop analysis of nanofluids in turbulent forced convective flows. International Journal of Thermal Sciences, 60, pp. 236-243.
[2]   Bhuiya, M.M.K., Chowdhury, M.S.U., Shahabuddin, M., Saha, M., Memon, L.A., 2013. Thermal characteristics in a heat exchanger tube fitted with triple twisted tape inserts. International Communications in Heat and Mass Transfer, 48, pp.  124-132.
[3]   Dnyaneshwar, R, Waghole., R.M., Warkhedkar., V.S., Kulkarni., R.K., Shrivastva., 2014. Experimental Investigations on Heat Transfer and Friction Factor of Silver Nanofliud in Absorber/Receiver of Parabolic Trough Collector with Twisted Tape Inserts. Energy Procedia, 45, pp. 558-567.
[4]   Smith, E.A., Chayut, N., Pongjet, P., 2013. Effect of Twin Delta-Winged Twisted-Tape on Thermal Performance of Heat Exchanger Tube. Heat Transfer Engineering, 34(15).
[5]   Kim, S.K., Ha, M.Y., Son, C. et al, 2014. An experimental study on the pressure drop and heat transfer through straight and curved small diameter tubes. J. Mech. Sci. Technol., 28, pp. 797–809.
[6]   Hamdi, E.A., Ahmed, M.I., Yusoff, M.Z., 2015. Heat transfer enhancement in a triangular duct using compound nanofluids and turbulators. Applied Thermal Engineering, 91, pp. 191-201.
[7]   Zhang, J., Diao, Y., Zhao, Y., Zhang, Y., 2017. An experimental investigation of heat transfer enhancement in minichannel: Combination of nanofluid and micro fin structure techniques. Experimental Thermal and Fluid Science, 81, pp. 21-32.
[8]   Mashoofi, N., Pesteei, S.M., Moosavi, A., Sadighi Dizaji, H., 2017. Fabrication method and thermal-frictional behavior of a tube-in-tube helically coiled heat exchanger which contains turbulator. Applied Thermal Engineering, 111, pp. 1008-1015.
[9]   Sheikholeslami, M., Ganji, D.D., Gorji-Bandpy, M., 2016. Experimental and numerical analysis for effects of using conical ring on turbulent flow and heat transfer in a double pipe air to water heat exchanger. Applied Thermal Engineering, 100, pp. 805-819.
[10] Shirvan, K.M., Mamourian, M., Mirzakhanlari, S., Ellahi, R., 2017. Numerical investigation of heat exchanger effectiveness in a double pipe heat exchanger filled with nanofluid: A sensitivity analysis by response surface methodology. Powder Technology, 313, pp. 99-111.
[11] Panahi, D., Zamzamian, K., 2017. Heat transfer enhancement of shell-and-coiled tube heat exchanger utilizing helical wire turbulator. Applied Thermal Engineering, 115, pp. 607-615
[12] Bezaatpour, M., Goharkhah, M., 2019. Convective heat transfer enhancement in a double pipe mini heat exchanger by magnetic field induced swirling flow. Applied Thermal Engineering, 110, pp. 380-410.
[13] Sheikholeslami, M., Haq, R.U., Shafee, A., Li, Z., 2019. Heat transfer behavior of nanoparticle enhanced PCM solidification through an enclosure with V shaped fins. International Journal of Heat and Mass Transfer, 130, pp.1322–1342.
[14] Qi, C., Tang, J., Ding, Z., Yan, Y., Guo, L., Ma, Y., 2019. Effects of rotation angle and metal foam on natural convection of nanofluids in a cavity under an adjustable magnetic field. International Communications in Heat and Mass Transfer, 109, 104349.
[15] Abdelrazek, A.H., Kazi, S.N., Alawi, O.A., Yusoff, N., Oon, C.S., Muhammad Ali, H., 2019. Heat transfer and pressure drop investigation through pipe with different shapes using different types of nanofluids. Journal of Thermal Analysis and Calorimetry.
[16] Berberovi´c, E., and Biki´c, S., 2019. Computational Study of Flow and Heat Transfer Characteristics of EG-Si3N4 Nanofluid in Laminar Flow in a Pipe in Forced Convection Regime. In the 1st International Conference on Nanofluids (ICNf) and 2nd European Symposium on Nanofluids (ESNf), 26–28 June 2019, Castelló, Spain. Conference Proceedings. pp. 226–230.
[17] Bahiraei, M., Mazaheri, N., Sheykh Mohammadi, M., Moayedi, H., 2019. Thermal performance of a new nanofluid containing biologically functionalized graphene nanoplatelets inside tubes equipped with rotating coaxial double-twisted tapes. International Communications in Heat and Mass Transfer, 108, 104305.
[18] Hajialigol, N., Daghigh, R., 2020. The evaluation of the first and second laws of thermodynamics for the pulsating MHD nanofluid flow using CFD and machine learning approach. Journal of the Taiwan Institute of Chemical Engineers, 150, pp. 84-93.
[19] Zhou, J., Alizadeh, A., Ashraf Ali, M., Sharma, K., 2023. The use of machine learning in optimizing the height of triangular obstacles in the mixed convection flow of two-phase MHD nanofluids inside a rectangular cavity. Engineering Analysis with Boundary Elements, 150, pp. 84-93.
[20] Bhaskar, K., Sharma, K. & Bhaskar, K. 2023. Cross-diffusion and chemical reaction effects of a MHD nanofluid flow inside a divergent/convergent channel with heat source/sink. J. Therm. Anal. Calorim., 148, pp. 573–588.
[21] Tavakoli, M., Soufivand, MR., 2023. Investigation of entropy generation, PEC, and efficiency of parabolic solar collector containing water/Al2O3− MWCNT hybrid nanofluid in the presence of finned and perforated twisted tape turbulators using a two-phase flow scheme. Engineering Analysis with Boundary Elements, 148, pp. 324-335.
[22] El-Shafay, AS., Mohamed, AM., Ağbulut Ü, 2023. Gad MS. Investigation of the effect of magnetic field on the PEC and exergy of heat exchanger filled with two-phase hybrid nanofluid, equipped with an edged twisted tape. Engineering Analysis with Boundary Elements, 148, pp. 153-164.
[23] Mohadjer, A., Nobakhti, M.H., Nezamabadi, A., Ajarostaghi, SS., 2024. Thermohydraulic analysis of nanofluid flow in tubular heat exchangers with multi-blade turbulators: The adverse effects. Heliyon, 10(9), 72, pp. 436-461
[24] Wang, L., Wang, J., Tang, J., Zho, X., 2024. Enhancing heat exchanger efficiency with novel perforated cone-shaped turbulators and nanofluids: a computational study. Chemical Product and Process Modeling, 19(1), pp. 147-158.
[25] Sheikholeslami, M., Abd Ali, F.A., 2024. Influence of vortex generator on performance of concentrated solar photovoltaic module in existence of heat sink. Applied Thermal Engineering, 253, 123758.
[26] Hejazian, M., Moraveji, M.K., Beheshti, A., 2014. Comparative study of Euler and mixture models for turbulent flow of Al2O3 nanofluid inside a horizontal tube. International Communications in Heat and Mass Transfer, 52, pp. 152-158.
[27] Aminfar, H., Mohammadpourfard, M., Mohseni, F., 2012. Two-phase mixture model simulation of the hydro-thermal behavior of an electrically conductive ferrofluid in the presence of magnetic fields. Journal of Magnetism and Magnetic Materials, 324, pp. 830-842.
[28] Xiong, Q., Jafaryar, M., Divsalar, A., Sheikholeslami, M., Shafee, A., Dat, D., Vo, M. Khan, H., Tlili, I., Lijk, Z., 2019. Macroscopic simulation of nanofluid turbulent flow due to compound turbulator in a pipe. Chemical Physics, 527, pp. 110-475.
[29] Amer Qureshi, M., Hussain, S., Adil Sadiq, M., 2021. Numerical simulations of MHD mixed convection of hybrid nanofluid flow in a horizontal channel with cavity: Impact on heat transfer and hydrodynamic forces. Case Studies in Thermal Engineering, 27, p. 101323.
[30] Typical Properties of SYLTHERM 800 Fluid 1. n.d.
[31] Nasirzadehroshenin, F., Maddah, H., Sakhaeinia, H., Pourmozafari, A., 2019. Investigation of exergy of double-pipe heat exchanger using synthesized hybrid nanofluid developed by modeling. International Journal of Thermophysics, 40, pp. 1-24.
[32] Sundar L.S., K.Singh, M., Antonio M.C.F., Sousa, C.M., 2017. Experimental investigation of the thermal transport properties of graphene oxide/Co3O4 hybrid nanofluids. International Communications in Heat and Mass Transfer, 84, pp. 1-10.
[33] Sheikholeslami, M., Shehzad, S.A., 2018. Numerical analysis of Fe3O4–H2O nanofluid flow in permeable media under the effect of external magnetic source. International Journal of Heat and Mass Transfer, 118, pp. 182-192.
[34] Ma, Y., Mohebbi, R., Rashidi, M.M., Yang, Z., 2019. MHD convective heat transfer of Ag-MgO/water hybrid nanofluid in a channel with active heaters and coolers. International Journal of Heat and Mass Transfer, 137, pp. 714-726.
[35] Al-Asadi, M.T., Alkasmoul, F.S., Wilson, M.C., 2016. Heat transfer enhancement in a micro-channel cooling system using cylindrical vortex generators. International Communications in Heat and Mass Transfer, 74, pp.40-47.
[36] Bellos, E., Tzivanidis, C., Tsimpoukis, D., 2018. Optimum number of internal fins in parabolic trough collectors. Applied Thermal Engineering, 137, pp. 669-677.
[37] Yang, J., Feng, Z., 2024. Assessing the use of PEC and jf methods for strengthening the evaluation of new heat exchangers. Heliyon, 10(10), pp. 142-169.
[38] Gürdal, M., Pazarlıoğlu, H.K., Tekir, M., Arslan, K., Gedik, E., 2022. Numerical investigation on turbulent flow and heat transfer characteristics of ferro-nanofluid flowing in dimpled tube under magnetic field effect. Applied Thermal Engineering, 200, 117655.

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History

  • Receive Date: 04 January 2025
  • Revise Date: 05 April 2025
  • Accept Date: 21 July 2025

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