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Experimental and multiphase analysis of nanofluids on the conjugate performance of micro-channel at low Reynolds numbers

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Abstract

The present study investigates the laminar forced convection flow of single walled carbon nanotube (SWCNT), gold (Au), aluminum oxide (Al2O3), silver (Ag) and hybrid (Al2O3 + Ag) nanofluids (HyNF) in a wide rectangular micro-channel at low Reynolds numbers. The heat transfer characteristics of de-ionized (DI) water and SWCNT nanofluid with different nanoparticle volume concentrations have been experimental studied. Furthermore, numerical study has also been carried out to investigate the flow and heat transfer characteristics of DI water, SWCNT, Au, Al2O3, Ag and HyNF at different Reynolds numbers with different nanoparticle volume concentrations and particle diameters. The numerical study consider the effects of both inertial and viscous forces by solving the full Navier-Stokes equations at low Reynolds numbers. A two dimensional conjugate heat transfer multiphase mixture model has been developed and used for numerical study. A significant enhancement in the average Nusselt number is observed both experimentally and numerically for nanofluids. The study presents four optimized combinations of nanofluids (1 vol% SWCNT and 1 vol% Au with \(d_p\) = 50 nm), (2 vol% SWCNT and 3 vol% Au with \(d_p\) = 70 nm), (3 vol% Al2O3 and 2 vol% Au with \(d_p\) = 70 nm) as well as (3 vol% HyNF (2.4% Al2O3 + 0.6% Ag) and 3 vol% Au with \(d_p\) = 50 nm) that provides a better switching option in choosing efficient working fluid with minimum cost based on cooling requirement. The conduction phenomenon of the solid region at bottom of the micro-channel is considered in the present investigation. This phenomenon shows that the interface temperature between solid and fluid region increases along the length of the channel. The present results has been validated with the experimental and numerical results available in the literature.

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Abbreviations

A :

Surface area of the particle (m\(^2\))

\(C_p\) :

Specific heat (J/kg K)

d :

Nanoparticle diameter (nm)

\(D_h\) :

Hydraulic diameter (m)

\(k_s\) :

Thermal conductivity of solid (W/m K)

\(k_f\) :

Thermal conductivity of fluid (W/m K)

\(K_B\) :

Boltzmann constant (J/K)

Nu :

Nusselt number

\(q_0\) :

Heat flux (W/m\(^2\))

Re :

Reynolds number

T :

Dimensional temperature (K)

\(\overrightarrow{U}\) :

Dimensional velocity vector (m/s)

U :

Dimensional axial velocity (m/s)

\(V_p\) :

Volume of the particle (m\(^3\))

\(\rho \) :

Density (kg /m\(^3\))

\(\mu \) :

Dynamic viscosity (kg/m s)

\(\phi \) :

Volume concentration

avg :

Average

bf :

Basefluid

c :

Continuous phase

f :

Fluid

m :

Mixture

nf :

Nanofluid

p :

Particle

\(*\) :

Non-dimensional or dimensionless quantity

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Authors and Affiliations

  1. Department of Mechanical and Aerospace Engineering, Indian Institute of Technology Hyderabad, Hyderabad, 502285, India

    Rajesh Nimmagadda & K. Venkatasubbaiah

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  1. Rajesh Nimmagadda
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  2. K. Venkatasubbaiah
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Correspondence to K. Venkatasubbaiah.

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Nimmagadda, R., Venkatasubbaiah, K. Experimental and multiphase analysis of nanofluids on the conjugate performance of micro-channel at low Reynolds numbers. Heat Mass Transfer 53, 2099–2115 (2017). https://doi.org/10.1007/s00231-017-1970-2

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  • DOI: https://doi.org/10.1007/s00231-017-1970-2

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