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• W2313441073 abstract "One of the important objectives in thermal systems engineering is to analyze utilization of thermal energy in an efficient manner. Analysis based on second law of thermodynamics may give an insight about efficient usage of thermal energy in various industrial systems. In this regard, entropy generation analysis during conjugate natural convection within a differentially heated square cavity enclosed by vertical conducting walls of different thicknesses (t1 and t2) has been carried out for various thermal systems. Finite element based numerical simulations are carried out for various location of vertical wall thicknesses (cases 1, 2, and 3) in the range of parameters, Ra (103 ≤ Ra ≤ 105), Pr (Pr = 0.015–1000), wall thicknesses (t = 0.2 and 0.8), and conductivity ratios (K = 0.1,1 10 and ∞). Maximum entropy generation due to heat transfer (Sθ,max) occurs near the solid–fluid interface region due to high temperature gradient whereas maximum magnitude of the entropy generation due to fluid friction (Sψ,max) occurs near the cavity walls due to friction between the circulation cells and cavity walls. Larger heat transfer and high intensity fluid flow lead to larger Sθ,max and Sψ,max for K = 10 compared to that of K = 0.1 and K = 1 irrespective of Pr and location of solid wall thickness. Qualitative features of θ, ψ, Sθ and Sψ for t1 + t2 = 0.8 are identical with t1 + t2 = 0.2. However, the magnitude of Sθ,max and Sψ,max is less for t1 + t2 = 0.8 compared to t1 + t2 = 0.2. Based on detailed discussion of average Nusselt number (Nul), average Bejan number (Beavg) and total entropy generation (Stotal) vs various governing parameters (Ra, Pr and t), it may be concluded that thermal processing is invariant of K in conduction dominant region (103 ≤ Ra ≤ 104) irrespective of Pr and t. On the other hand, K ≤ 1 with t1 + t2 ≈ 0.8 may be optimal for thermal processing within the convection dominant region (104 ≤ Ra ≤ 105) due to less entropy generation and reasonable heat transfer rate, irrespective of Pr." @default.
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• W2313441073 date "2014-02-24" @default.
• W2313441073 modified "2023-10-03" @default.
• W2313441073 title "Analysis of Entropy Generation during Conjugate Natural Convection within a Square Cavity with Various Location of Wall Thickness" @default.
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• W2313441073 doi "https://doi.org/10.1021/ie403033f" @default.
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