Publication: Analysis of thermal management on processing of fluids within rhombic cavities: Heatlines vs. entropy generation
Date
01-11-2016
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Abstract
The present work involves the detailed heat flow visualization with the distribution of the entropy generation in order to estimate the energy efficiency of rhombic cavities with various angles of inclination (φ=45∘,60∘ and 75°) for different areas (A=0.5,1 and 1.5) with Ra=103−105 for Pr=0.015 and 1000. The cavities involve isothermally hot bottom wall in the presence of cold side and top walls. Results have been presented in the form of isotherms (θ), streamlines (ψ), heatlines (Π), entropy generation due to heat transfer (Sθ) and fluid friction (Sψ). Results have also been compared with the square cavity (φ=90∘) in terms of the total entropy generation (Stotal), average Bejan number (Beav) and average heat transfer rate (Nub¯ and Nul¯). The numerical studies clearly demonstrate that, the square enclosure may not be the optimal choice based on the lesser heat transfer rate and higher entropy generation. Overall, the rhombic cavities with φ=45∘ at A=0.5 may be concluded as the optimal design for the efficient thermal processing based on the higher heat transfer rate and lower entropy generation.
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Keywords
Entropy generation, Heatlines, Natural convection, Nusselt number, Rhombic enclosures, Thermal management