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research-article

Investigations on convective heat transfer enhancement in circular tube radiator using Al2O3 and CuO nanofluids

[+] Author and Article Information
Sobin Alosious

Research Scholar, Department of Applied Mechanics, Indian Institute of Technology, Madras
sobinalosious@gmail.com

Sarath S R

Department of Mechanical Engineering, College of Engineering, Trivandrum
otoorkalamsarath@gmail.com

Anjan R Nair

Department of Mechanical Engineering, College of Engineering, Trivandrum
anjanrn@gmail.com

K. Krishnakumar

Department of Mechanical Engineering, College of Engineering, Trivandrum
kkk@cet.ac.in

1Corresponding author.

ASME doi:10.1115/1.4039924 History: Received July 21, 2017; Revised March 06, 2018

Abstract

In this study, forced convective heat transfer inside a circular tube automobile radiator is experimentally and numerically investigated. The investigation is carried out using Al2O3 and CuO nanofluids with water as their base fluid. A single radiator circular tube with the same dimensions is numerically modeled. Numerical model is validated using the experimental study results. In the experimental study, Al2O3 and CuO nanofluids of 0.05% volume concentrations (f) were recirculated through the radiator for the Reynolds number (Re) between 260 to 1560. The numerical investigation is conducted for the nanoparticle volume concentration from 0 to 6.0% and 260 < Re < 1560. The investigation shows an enhancement of convective heat transfer coefficient (h) with the increase in nanoparticle volume concentration and with the Reynolds number. A maximum enhancement of 38% and 33% were found for Al2O3 and CuO nanofluids of f = 1% and Re = 1560. For the same cooling load of the radiator, the pumping power can be reduced by 8% and 10%, when Al2O3 and CuO nanofluids (f = 0.8%) were used. However, the addition of nanofluid results in an enhancement of density and viscosity along with a reduction in specific heat capacity. Hence the selection of nanoparticle volume concentration should consider its effect on the thermophysical properties. It is found that the preferred concentration is between 0.4% to 0.8% for both Al2O3 and CuO nanofluids. In our investigations, it is observed that the convective heat transfer performance of Al2O3 nanofluid is better than the CuO nanofluid.

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