Parametric Analysis of Entropy Generation in Turbulent Convective Forced Flow in Spiral Channels at Constant Wall Temperature

Faraj El Sagier*
Department of Mechanical Engineering, University of Tripoli, Libya.
Periodicity:February - April'2022
DOI : https://doi.org/10.26634/jme.12.2.18387

Abstract

This paper discuses parametric analysis of entropy generation in a forced convective turbulent flow of an incompressible fluid at a constant wall temperature through spiral channel of rectangular cross section of flow path has been carried out in terms of mass flow rates, temperature differences between fluid flow and temperature of the wall of the passage surface, width of the spiral passages and the shape geometry, as well as the types of fluids. Air is used as the working fluid, and in addition, water and oil are used in the parametric study. The competition between heat transfer enhancement and entropy generation has been addressed. Comparison between entropy generation profiles for different passage widths and shapes have been reported. It is found that mass flow rate and inlet fluid temperature have a considerable impact on entropy generation and hence on heat transfer enhancement. The findings show that the narrowing passage consumes more pump power to overcome viscous dissipation. Regarding the channel shape, it was found that the rectangular channel has the highest Bejan number (Be), while the circular spiral channel requires more pump power than the others. The data obtained indicate that the selection of the most suitable configuration and the best flow conditions becomes a critical task. Also, secondary flow due to centrifugal force and curvature has a significant effect on increasing heat transfer and entropy generation.

Keywords

Entropy Generation, Turbulent Convective, Spiral Passage, Secondary Flow.

How to Cite this Article?

El-Sagier, F. (2022). Parametric Analysis of Entropy Generation in Turbulent Convective Forced Flow in Spiral Channels at Constant Wall Temperature. i-manager’s Journal on Mechanical Engineering, 12(2), 22-32. https://doi.org/10.26634/jme.12.2.18387

References

[1]. Bejan, A. (1979). A study of entropy generation in fundamental convective heat transfer. Journal of Heat Transfer, 101(4), 718-725. https://doi.org/10.1115/1.3451063
[2]. Bejan, A. (1980). Second law analysis in heat transfer. Energy, 5(8-9), 720-732. https://doi.org/10.1016/0360-5442(80)90091-2
[3]. Bejan, A. (1982). Entropy Generation through Heat and Fluid Flow. Wiley, New York.
[4]. Bejan, A. (1988). Advanced Engineering Thermodynamics. Wiley & Sons, New York.
[5]. Bejan, A. (1995). Entropy Generation Minimization. CRC Press, Boca Raton, (pp. 400). https://doi.org/10.1201/9781482239171
[6]. El-Sagier, F. E. M. (1998). Experimental and Numerical Study of Solid-Liquid Phase Change Transition in a Spiral Energy Storage Unit (Doctoral dissertation), The Institute of Heat Engineering, Warsaw University of Technology, Poland.
[7]. Jarungthammachote, S. (2010). Entropy generation analysis for fully developed laminar convection in hexagonal duct subjected to constant heat flux. Energy, 35(12), 5374-5379. https://doi.org/10.1016/j.energy.2010.07.020
[8]. Kakaç, S., Shah, R. K., & Aung, W. (1987). Handbook of Single-Phase Convective Heat Transfer. John Wiley &Sons.
[9]. Ko, T. H. (2006). Thermodynamic analysis of optimal mass flow rate for fully developed laminar forced convection in a helical coiled tube based on minimal entropy generation principle. Energy Conversion and Management, 47(18-19), 3094-3104. https://doi.org/10.1016/j.enconman.2006.03.006
[10]. Mahmud, S., & Fraser, R. A. (2002). Second law analysis of heat transfer and fluid flow inside a cylindrical annular space. Exergy, an International Journal, 2(4), 322-329. https://doi.org/10.1016/S1164-0235(02)00078-X
[11]. Morimoto, E., & Hotta, K. (1988). Study of the geometric structure and heat transfer characteristics of a spiral plate heat exchanger. Heat transfer. Japanese research, 17(1), 53-71.
[12]. Öztop, H. F., Şahin, A. Z., & Dağtekin, İ. (2004). Entropy generation through hexagonal cross sectional duct for constant wall temperature in laminar flow. International Journal of Energy Research, 28(8), 725-737. https://doi.org/10.1002/er.994
[13]. Rohsenow, W M, Hartnett, J P, & Ganic, E N. (1985). Handbook of Heat Transfer Fundamentals (2nd edn.). NY: McGraw-Hill.
[14]. Şahin, A. Z. (1998a). A second law comparison for optimum shape of duct subjected to constant wall temperature and laminar flow. Heat and Mass Transfer, 33(5), 425-430. https://doi.org/10.1007/s002310050210
[15]. Şahin, A. Z. (1998b). Irreversibilities in various duct geometries with constant wall heat flux and laminar flow. Energy, 23(6), 465-473. https://doi.org/10.1016/S0360-5442(98)00010-3
[16]. Şahin, A. Z. (1998c). Second law analysis of laminar viscous flow through a duct subjected to constant wall temperature. Journal of Heat Transfer, 120(1), 76-83. https://doi.org/10.1115/1.2830068
[17]. Şahin, A. Z. (2000). Entropy generation in turbulent liquid flow through a smooth duct subjected to constant wall temperature. International Journal of Heat and Mass Transfer, 43(8), 1469-1478. https://doi.org/10.1016/S0017-9310(99)00216-1
[18]. Şahin, A. Z. (2002). Entropy generation and pumping power in a turbulent fluid flow through a smooth pipe subjected to constant heat flux. Exergy, an International Journal, 2(4), 314-321. https://doi.org/10.1016/S1164-0235(02)00082-1
[19]. Şahin, A. Z., & Ben-Mansour, R. (2003). Entropy generation in laminar fluid flow through a circular pipe. Entropy, 5(5), 404-416. https://doi.org/10.3390/e5050404
[20]. Sekulic, D. P., Campo, A., & Morales, J. C. (1997). Irreversibility phenomena associated with heat transfer and fluid friction in laminar flows through singly connected ducts. International Journal of Heat and Mass Transfer, 40(4), 905-914. https://doi.org/10.1016/0017-9310(96)00123-8
[21]. Shah, R. K., & Sekulic, D. P. (2003). Fundamentals of Heat Exchanger Design. John Wiley & Sons.
[22]. Taherian, H., & Mirgolbaba, H. (2009). Irreversibilities in duct geometries of rhombic and circular with constant wall heat flux and laminar flow. Journal of Applied Sciences, 9(2), 327-333. https://doi.org/10.3923/jas.2009.327.333
[23]. Talebi, M. (2010). Entropy generation analysis of a variable property fluid convection in a helical tube. World Applied Science Journal, 10(4), 406-415.
[24]. Yilmaz, M., Sara, O. N., & Karsli, S. (2001). Performance evaluation criteria for heat exchangers based on second law analysis. Exergy, an International Journal, 1(4), 278-294. https://doi.org/10.1016/S1164-0235(01)00034-6
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