Investigation of heat transfer and pressure drop in microchannel heat sink using AI2O3 and ZrO2 nanofluids

Khan, Muhammad Zia Ullah and Uddin, Emad and Akbar, Bilal and Akram, Naveed and Naqvi, Ali Ammar and Sajid, Muhammad and Ali, Zaib and Younis, Md Yamin and Garcia Marquez, Fausto Pedro (2020) Investigation of heat transfer and pressure drop in microchannel heat sink using AI2O3 and ZrO2 nanofluids. Nanomaterials, 10 (9). ISSN 2079-4991, DOI

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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 mu m 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 mu m 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.

Item Type: Article
Funders: European Commission [Grant No: 01110G0137], Universidad de Castilla-La Mancha, Plan Propio de Investigacion
Uncontrolled Keywords: Laminar flow; Conjugate heat transfer; Dean vortices; Nusselt number; Friction factor
Subjects: Q Science > QC Physics
Q Science > QD Chemistry
T Technology > T Technology (General)
Divisions: Faculty of Engineering
Depositing User: Mrs. Siti Mawarni Salim
Date Deposited: 19 Sep 2022 07:04
Last Modified: 19 Sep 2022 07:04

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