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Research Papers

Two-Phase Analysis on the Conjugate Heat Transfer Performance of Microchannel With Cu, Al, SWCNT, and Hybrid Nanofluids

[+] Author and Article Information
Rajesh Nimmagadda

Department of Mechanical
& Aerospace Engineering,
Indian Institute of Technology Hyderabad,
Hyderabad 502285, Telangana, India
e-mail: me12p1006@iith.ac.in

K. Venkatasubbaiah

Department of Mechanical
& Aerospace Engineering,
Indian Institute of Technology Hyderabad,
Hyderabad 502285, Telangana, India
e-mail: kvenkat@iith.ac.in

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received November 19, 2016; final manuscript received March 23, 2017; published online June 13, 2017. Assoc. Editor: Ranganathan Kumar.

J. Thermal Sci. Eng. Appl 9(4), 041011 (Jun 13, 2017) (10 pages) Paper No: TSEA-16-1335; doi: 10.1115/1.4036804 History: Received November 19, 2016; Revised March 23, 2017

This 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 microchannel 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. Sphericity-based effective thermal conductivity evaluation is considered in the case of SWCNT nanofluids by using volume and surface area of nanotubes. A significant enhancement in the average Nusselt number is observed numerically for both pure and hybrid nanofluids. 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. Whereas, 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)) that provides a better switching option in choosing efficient working fluid with minimum cost based on cooling requirement. The study also shows that by dispersing SWCNT nanoparticles, one can enhance the heat transfer characteristics of base fluid containing methanol as antifreeze. The conduction phenomena of solid region cause the interface temperature between solid as well as fluid regions to increase along the length of the microchannel. The developed numerical model is validated with the numerical and experimental results available in the literature.

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Figures

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Fig. 1

Schematic diagram of microchannel

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Fig. 2

Grid independence study at Re = 600: ((a) and (c)) velocity and ((b) and (d)) temperature

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Fig. 3

Pure water (solid lines) and 3 vol % SWCNT nanofluid (dashed lines) for Re = 600: (a) velocity contours and (b) temperature contours

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Fig. 4

Effect of Re and volume concentration: (a) interface temperature along the channel length and ((b) and (c)) local Nusselt number along the channel length

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Fig. 5

Validation with experimental and numerical results in terms of average Nusselt number

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Fig. 6

Dimensional profiles of 3 vol % SWCNT nanofluid for different Re: (a) velocity at exit and (b) temperature at exit

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Fig. 7

Dimensional profiles of velocity at exit of the microchannel for pure water and different nanofluids at Re = 600

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Fig. 8

Dimensional profiles of temperature at exit of the microchannel for pure water and different nanofluids at Re = 600

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Fig. 9

Average Nusselt numbers of pure water and different nanofluids at different Re

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