Journal
POWDER TECHNOLOGY
Volume 355, Issue -, Pages 552-563Publisher
ELSEVIER
DOI: 10.1016/j.powtec.2019.07.087
Keywords
Hybrid nanofluid; Fin configuration; Micro pin-fin heat sink; Heat transfer; Fluid flow
Categories
Funding
- National Research Foundation of Korea - Korean government (MSIP) [2017R1A2B2005515]
- National Research Foundation of Korea [2017R1A2B2005515] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This manuscript is aimed at investigating the thermohydraulic characteristics of Al2O3 - Cu/water hybrid nanofluid in a micro pin-fin heat sink by implementing a multiphase Lagrangian-Eulerian approach. In modelling the nanofluid the influence of slip mechanisms i.e. Saffman lift and drag force, Brownian motion, gravity, virtual mass, thermophoresis and pressure gradient-induced force is included. In addition, the fin efficiency of the nanofluid cooled sharp and streamlined fin configurations is probed by analysing diamond, circular and elliptical fins arranged in the staggered assembly. Spherical shaped hybrid nanoparticles of 15 nm are studied for the particle volume fraction of 1%. The performance of heat sinks is evaluated by analysing the quantitative parameters including log mean temperature difference, average (Nu(avg)) and surface (Nu(s)) Nusselt number. Besides, the flow streamlines, thermal and vorticity contours represent the qualitative depiction of flow and thermal distributions. Results demonstrate that utilising nanofluid optimises Nu(avg) enhancement to maximum values of 25.14%, 19.65% and 24% for diamond, circular and elliptical fins, respectively. The thermal efficiency of nanofluid is highest across the upstream fins and it diminishes towards the downstream fins. At the highest pressure drop, the fin efficiency of the studied fin configurations is in the order of circular, elliptical and diamond fins. (C) 2019 Elsevier B.V. All rights reserved.
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