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Article

Investigation of Heat Transfer and Pressure Drop in Microchannel Heat Sink Using Al2O3 and ZrO2 Nanofluids

1
Department of Mechanical Engineering, School of Mechanical and Manufacturing Engineering (SMME), National University of Science and Technology, Islamabad 44000, Pakistan
2
Department of Mechanical Engineering, Mirpur University of Science and Technology (MUST), Mirpur-10250 (AJK), Pakistan
3
Department of Mechanical Engineering, Faculty of Mechanical Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia
4
Ingenium Research Group, University of Castilla-La Mancha, 13071 Ciudad Real, Spain
*
Authors to whom correspondence should be addressed.
Nanomaterials 2020, 10(9), 1796; https://doi.org/10.3390/nano10091796
Received: 20 August 2020 / Revised: 4 September 2020 / Accepted: 7 September 2020 / Published: 9 September 2020
(This article belongs to the Special Issue Applications of Nanofluids)
A new micro heat exchanger was analyzed using numerical formulation of conjugate heat transfer for single-phase fluid flow across copper microchannels. The flow across bent channels harnesses asymmetric laminar flow and dean vortices phenomena for heat transfer enhancement. The single-channel analysis was performed to select the bent channel aspect ratio by varying width and height between 35–300 μm for Reynolds number and base temperature magnitude range of 100–1000 and 320–370 K, respectively. The bent channel results demonstrate dean vortices phenomenon at the bend for Reynolds number of 500 and above. Thermal performance factor analysis shows an increase of 18% in comparison to straight channels of 200 μm width and height. Alumina nanoparticles at 1% and 3% concentration enhance the Nusselt number by an average of 10.4% and 23.7%, respectively, whereas zirconia enhances Nusselt number by 16% and 33.9% for same concentrations. On the other hand, thermal performance factor analysis shows a significant increase in pressure drop at high Reynolds number with 3% particle concentration. Using zirconia for nanofluid, Nusselt number of the bent multi-channel model is improved by an average of 18% for a 3% particle concentration as compared to bent channel with deionized water. View Full-Text
Keywords: laminar flow; conjugate heat transfer; dean vortices; Nusselt number; friction factor laminar flow; conjugate heat transfer; dean vortices; Nusselt number; friction factor
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MDPI and ACS Style

Khan, M.Z.U.; Uddin, E.; Akbar, B.; Akram, N.; Naqvi, A.A.; Sajid, M.; Ali, Z.; Younis, M.Y.; García Márquez, F.P. Investigation of Heat Transfer and Pressure Drop in Microchannel Heat Sink Using Al2O3 and ZrO2 Nanofluids. Nanomaterials 2020, 10, 1796. https://doi.org/10.3390/nano10091796

AMA Style

Khan MZU, Uddin E, Akbar B, Akram N, Naqvi AA, Sajid M, Ali Z, Younis MY, García Márquez FP. Investigation of Heat Transfer and Pressure Drop in Microchannel Heat Sink Using Al2O3 and ZrO2 Nanofluids. Nanomaterials. 2020; 10(9):1796. https://doi.org/10.3390/nano10091796

Chicago/Turabian Style

Khan, Muhammad Z.U., Emad Uddin, Bilal Akbar, Naveed Akram, Ali A. Naqvi, Muhammad Sajid, Zaib Ali, Md. Y. Younis, and Fausto P. García Márquez 2020. "Investigation of Heat Transfer and Pressure Drop in Microchannel Heat Sink Using Al2O3 and ZrO2 Nanofluids" Nanomaterials 10, no. 9: 1796. https://doi.org/10.3390/nano10091796

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