To transport the energy efficiently without much dissipation, first and second law analyses of mixed convection heat transport from an array of nonisothermal rectangular vertical plate-finned heat sink are made using purely computational fluid dynamics (CFD) analysis on the governing equations. Report provides the dependence of Nusselt number, entropy production, pumping power ratio (PPR), and flow bypass factor (BF) on the inlet velocity, fin conductance parameter, thermal Grashof number (Gr), dimensionless clearance (C*), and dimensionless fin spacing (S*). Total nondimensional entropy production is found to decrease continuously with clearances for all fin spacings, except at the lowest fin spacing involving lowest Gr (= 1.8 × 105). On the other hand, at higher inlet velocities, Nusselt number indicates an optimum value with clearances. Optimum Nusselt number is found to observe in a range of S* = 0.2–0.3 for all Gr. For smaller fin spacing, PPR is noticeably higher, but at the optimum value of fin spacing, PPR reduces roughly by an order of magnitude. Interestingly, flow bypass is remarkably lower at the optimum clearance. Finally, correlation of friction factor, PPR, and entropy generation is presented.
Combined Energy and Exergy Analysis of a Nonisothermal Fin Array With Non-Boussinésq Variable Property Fluid
North Eastern Regional Institute of Science
Nirjuli, Arunachal Pradesh 791109, India
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received November 5, 2015; final manuscript received February 19, 2016; published online April 26, 2016. Assoc. Editor: Hongbin Ma.
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Das, B., and Giri, A. (April 26, 2016). "Combined Energy and Exergy Analysis of a Nonisothermal Fin Array With Non-Boussinésq Variable Property Fluid." ASME. J. Thermal Sci. Eng. Appl. September 2016; 8(3): 031010. https://doi.org/10.1115/1.4033012
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