Journal
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
Volume 138, Issue 2, Pages 1461-1476Publisher
SPRINGER
DOI: 10.1007/s10973-019-08168-x
Keywords
Porous medium; Metal foam; Local thermal non-equilibrium; Nanofluid; Double-layered channel; Sinusoidal channel; Heat sink
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The present study aims to enhance the hydrothermal performance of a porous sinusoidal double-layered heat sink using nanofluid. The optimum thickness of metal foam (nickel) for different Reynolds numbers ranging from 10 to 100 for the laminar regime and Darcy numbers ranging from 10(-4) to 10(-2) is obtained. At the optimum porous thicknesses, nanofluid (silver-water) with three volume fractions of nanoparticles equal to 2, 3, and 4% is employed to enhance the heat sink thermal performance. Darcy-Brinkman-Forchheimer model and the local thermal non-equilibrium model or two equations method are employed to model the momentum equation and energy equations in the porous region, respectively. It was found that in the cases of Darcy numbers 10(-4), 10(-3), and 10(-2) the dimensionless optimum porous thicknesses are 0.8, 0.8, and 0.2, respectively. It was also obtained that the maximum PEC number is 2.12 and it corresponds to the case with Darcy number 10(-2), Reynolds number 40, and volume fraction of nanoparticles 0.04. The validity of local thermal equilibrium (LTE) assumption was investigated, and it was found that increasing the Darcy number which results in an enhancement in porous particle diameter leads to some errors in results, under LTE condition.
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