Effect of baffle oientation on shell tube heat exchanger performance

Document Type: Full Lenght Research Article

Authors

1 Department of Mechanical Engineering.University of Kashan, Kashan, Iran

2 Department o Mechanical Engineering, University of Kashan, Kashan, Iran

3 kashan

Abstract

In this paper, fluid flow and heat transfer in the laboratory (small size) shell tube heat exchanger are analysed by computational fluid dynamic software. In this type of shell tube heat exchanger baffles with different angles of rotation: 00 (horizontal segmental baffle), 150 (from horizontal), 300, 450, 600, 750, 900 (vertical segmental baffle) is used. Effect of baffle orientation on shell tube heat exchanger performance is investigated. The flow domain is meshed by three-dimensional tetrahedral elements. The obtained result has a good agreement with the analytical method (Bell method) and experimental data in the literature. By comparing the pressure drop, heat transfer and heat transfer versus pressure drop (Q/ P) at same flow rate, the shell tube heat exchanger with orientation of (900) have better performance than other angles of baffle orientation. decrease pressure drop 26%, 4.1%, 17.6%, 24.42%, 14% rather than 150, 300, 450 ,600,750 ,00 angle of orientation respectively. That show have better performance than other angles of baffle orientation. So by reducing pressure drop with maintaining heat transfer rate, the operating cost reducing that can be best choice among other models.

Keywords

Main Subjects


References

[1].             Shah, R. K., & Secular, D. P. ‘‘Fundamentals of heat exchanger design’’, John Wiley &Soz, (2003).

[2].            Kakaç S, Liu HT. Heat exchangers: Selection, rating and thermal design, CRC Press, (1997).

[3].             J.-F. Zhang, B. Li, W.-J. Huang, Y.-G. Lei, Y.-L. He, W.-Q. Tao, ‘‘Experimental Performance Comparison of Shell-Side Heat Transfer for Shell-and-Tube Heat Exchangers with Middle-Overlapped Helical Baffles and Segmental Baffles’’, Chemical Engineering Science, 64, 1643-53, (2009).

[4].             M. Thirumarimurugan, T. Kannadasan, E. Ramasamy, “Performance analysis of shell and tube heat exchanger using miscible system,” American Journal of Applied Sciences, 5(5), 548-552, (2008).

[5].             K.S. Rao, ‘‘Analysis of flow maldistribution in tubular heat exchangers by fluent,” National Institute of Technology Rourkela, (2007).

[6].             B.I. Master, K.S. Chunangad, V. Pushpanathan, ‘‘Fouling mitigation using helixchanger heat exchangers’’, Engineering Conferences International, 366 (1Vol), (2003).

[7].             M. Salimpour, Heat transfer coefficients of shell and coiled tube heat exchangers, Experimental Thermal and Fluid Science, 33(2), 203-207, (2009)

[8].             Y.A. Kara, Ö. Güraras, ‘‘A computer program for designing of shell-and-tube heat exchangers’’, Applied Thermal Engineering, 24(13), 1797-1805, (2004).

[9].             U. Ur Rehman, ‘‘Heat transfer optimization of shell-and-tube heat exchanger through CFD Studies’’, Master thesis, Chalmers University of Technology, (2012).

[10].           J.-F. Zhang, Y.-L. He, W.-Q. Tao, ‘‘A design and rating method for shell-and-tube heat exchangers with helical baffles’’, Journal of Heat Transfer, 132(5), 051802-051802, (2010).

[11].           E. Ozden, I. Tari, ‘‘Shell side CFD analysis of a small shell-and-tube heat exchanger,’’ Energy Conversion and Management, 51(5), 1004-1014, 5//, (2010).

[12].           K.T.R. Raj, S. Ganne, ‘‘Shell side numerical analysis of a shell and tube heat exchanger considering the effects of baffle inclination angle on fluid flow using CFD’’, Thermal Science, 16(4), 1165-1174, (2012).

[13].           S. Ji, W.-j. Du, P. Wang et al., ‘‘Numerical Investigation on Double Shell-Pass Shell-and-Tube Heat Exchanger with Continuous Helical Baffles’’, Journal of Thermodynamics, 2011, 7, (2011).

[14].           Q. Wang, Q. Chen, G. Chen et al., ‘‘Numerical investigation on combined multiple shell-pass shell-and-tube heat exchanger with continuous helical baffles,’’ International Journal of Heat and Mass Transfer, 52(5), 1214-1222, (2009).

[15].           J.-F. Zhang, Y.-L. He, W.-Q. Tao, ‘‘3D numerical simulation on shell-and-tube heat exchangers with middle-overlapped helical baffles and continuous baffles – Part I: Numerical model and results of whole heat exchanger with middle-overlapped helical baffles,’’ International Journal of Heat and Mass Transfer, 52(23–24), 5371-5380, 11//, (2009).

[16].           J.-F. Zhang, Y.-L. He, and W.-Q. Tao, ‘‘3D numerical simulation on shell-and-tube heat exchangers with middle-overlapped helical baffles and continuous baffles–Part II: Simulation results of periodic model and comparison between continuous and noncontinuous helical baffles,’’ International Journal of Heat and Mass Transfer, 52(23), 5381-5389, (2009).

[17].           F. Nemati Taher, S. Zeyninejad Movassag, K. Razmi et al., ‘‘Baffle space impact on the performance of helical baffle shell and tube heat exchangers’’, Applied Thermal Engineering, 44, 143-149, 11//, (2012).

[18].           M. Zhang, F. Meng, Z. Geng, CFD simulation on shell-and-tube heat exchangers with small-angle helical baffles, Front. Chem. Sci. Eng., 9, 2, 183-193, 2015-07-14, (2015).

[19].           W. Jian, Y. Huizhu, S. Wang et al., “Numerical investigation on baffle configuration improvement of the heat exchanger with helical baffles,” Energy Conversion and Management, 89, 438-448, (2015).

 Fluent help 6.3.26 user’s guide, FLUENT Inc, 2006, section 25. 4. 3