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8th Thermal and Fluids Engineering Conference (TFEC)
March, 26-29, 2023, College Park, MD, USA

EFFECT OF MANIFOLD CONFIGURATIONS ON THE ENTROPY GENERATION IN RECHARGING MICROCHANNEL HEAT SINK

Get access (open in a dialog) pages 1581-1589
DOI: 10.1615/TFEC2023.mpf.046044

Abstract

A three-dimensional computational study is presented in this work to explore the effects of inlet/outlet manifold configurations on the entropy generation in a recharging microchannel heat sink (RMCHS). For this purpose, four types of inlet/outlet manifold configurations are considered: branched, rectangular, trapezoidal, and triangular. The numerical simulation is conducted for flow Re in the range of 50 to 300 for water flowing through the microchannel which is subjected to a constant heat flux of q" = 10 W/cm2 on the substrate bottom surface of RMCHS. Total entropy generation (SG) (which is the sum of thermal entropy generation (SG,T) and frictional entropy generation (SG,F)), and Bejan number (Be) are evaluated. It is observed that thermal entropy generation, total entropy generation, and Bejan number decrease while frictional entropy generation increases with increasing channel Reynolds number. It is also observed that the RMCHS with branched manifold configuration shows the lowest entropy generation and that with triangular manifold configuration shows the highest entropy generation among all the considered manifold configurations. Further, to know the advantages of branched, trapezoidal, and triangular manifolds over rectangular manifolds, the augmentation entropy generation number (NS,a) is evaluated, and from which it is observed that the branched manifold shows the lowest NS,a. This indicates that RMCHS with branched manifold configuration shows lowest thermodynamic irreversibility compared to rectangular manifold configuration. Overall, the RMCHS with branched manifold configuration reduced the entropy generation by a maximum of 7.3%, 7.4%, and 8.6% compared to rectangular, trapezoidal, and triangular manifold configurations, respectively.