Two-phase analysis on the conjugate heat transfer performance of microchannel with Cu, Al, SWCNT and hybrid nanofluids

N, Rajesh and K, Venkatasubbaiah (2017) Two-phase analysis on the conjugate heat transfer performance of microchannel with Cu, Al, SWCNT and hybrid nanofluids. Journal of Thermal Science and Engineering Applications, 9 (4). 041011-041021. ISSN 1948-5085

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Abstract

The present numerical study has been carried out by developing two phase mixture model with conjugate heat transfer. Pure and hybrid nanofluids (HyNF) with particle as well as base fluid hybridization are used in analyzing the performance of micro-channel under forced convection laminar flow. The flow as well as heat transfer characteristics of pure water, copper (Cu), Aluminum (Al), single walled carbon nanotube (SWCNT) and hybrid (Cu+Al, water+methanol) nanofluids with various nanoparticle volume concentrations at different Reynolds numbers are reported. Pure nanofluids such as Al, Cu and SWCNT with 3 vol.\% nanoparticle concentration enhanced the average Nusselt number by 21.09\%, 32.46\% and 71.25\% in comparison with pure water at Re = 600. Where as, in the case of hybrid nanofluids such as 3 vol.\% HyNF (0.6\% Cu + 2.4\% Al) and 3 vol.\% SWCNT (20\% Me + 80\% PW), the enhancement in average Nusselt number is observed to be 23.38\% and 46.43\% in comparison with pure water at Re = 600. The study presents three equivalent combinations of nanofluids [1 vol.\% Cu and 0.5 vol.\% SWCNT], [2 vol.\% Cu, 1 vol.\% SWCNT and 3 vol.\% HyNF (0.6\% Cu + 2.4\% Al)] as well as [2 vol.\% SWCNT and 3 vol.\% SWCNT (20\% Me + 80\% PW)]. The study also shows that by dispersing SWCNT nanoparticles one can enhance heat transfer characteristics of base fluid containing methanol as antifreeze. The developed numerical model is validated with the numerical and experimental results available in literature.

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