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Numerical investigation of the thermo‐hydraulic performance of water‐based nanofluids in a dimpled channel flow using Al 2 O 3 , CuO, and hybrid Al 2 O 3 –CuO as nanoparticles
Author(s) -
Ahmed Farid,
Abir Md Atrehar,
Fuad Muhtasim,
Akter Farhana,
Bhowmik Palash K.,
Alam Syed Bahauddin,
Kumar Dinesh
Publication year - 2021
Publication title -
heat transfer
Language(s) - English
Resource type - Journals
eISSN - 2688-4542
pISSN - 2688-4534
DOI - 10.1002/htj.22116
Subject(s) - nanofluid , pressure drop , materials science , nusselt number , reynolds number , heat transfer , heat transfer coefficient , dimple , thermodynamics , heat transfer enhancement , volume fraction , heat flux , mechanics , composite material , turbulence , physics
In this study, the authors study the impact of spherical dimple surfaces and nanofluid coolants on heat transfer and pressure drop. The main objective of this paper is to evaluate the thermal performance of nanofluids with respect to different Reynolds numbers ( Re ) and nanoparticle compositions in dimpled channel flow. Water‐based nanofluids with Al 2 O 3 , CuO, and Al 2 O 3 –CuO nanoparticles are considered for this investigation with 1%, 2%, and 4% volume fraction for each nanofluid. The simulations are conducted at low Reynolds numbers varying from 500 to 1250, assuming constant and uniform heat flux. The effective properties of nanofluids are estimated using models proposed in the literature and are combined with the computational fluid dynamics solver ANSYS Fluent for the analysis. The results are discussed in terms of heat transfer coefficient, temperature distributions, pressure drop, Nusselt number, friction factors, and performance criterion for all the cases. For all cases of different nanoparticle compositions, the heat transfer coefficient was seen as 35%–46% higher for the dimpled channel in comparison with the smooth channel. Besides, it was observed that with increasing volume fraction, the values of heat transfer and pressure drop were increased. With a maximum of 25.18% increase in the thermal performance, the 1% Al 2 O 3 /water was found to be the best performing nanofluid at Re = 500 in the dimpled channel flow.