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Research Papers: Micro/Nanoscale Heat Transfer

Investigation of Nanofluid Heat Transfer in a Microchannel Under Magnetic Field Via Lattice Boltzmann Method: Effects of Surface Hydrophobicity, Viscous Dissipation, and Joule Heating

[+] Author and Article Information
Ali Alipour Lalami

Faculty of Mechanical Engineering,
University of Guilan,
Rasht, Iran
e-mail: AliAlipourlalami@gmail.com

Hamid Hassanzadeh Afrouzi

Faculty of Mechanical Engineering,
Babol Noshirvani University of Technology,
P.O. Box 484,
Babol 47148-71167, Iran
e-mail: Hamidhasanzade@yahoo.com

Abouzar Moshfegh

Faculty of Medicine and Health Sciences,
Macquarie University,
Sydney NSW 2109, Australia;
ANZAC Research Institute,
The University of Sydney, Sydney,
NSW 2139, Australia
e-mail: abouzar.moshfegh@mq.edu.au

Mohammad Omidi

Faculty of Mechanical Engineering,
Babol Noshirvani University of Technology, Babol, Iran
e-mail: omidi_m10@yahoo.com

Ashkan Javadzadegan

ANZAC Research Institute,
The University of Sydney,
Sydney NSW 2139, Australia;
Faculty of Medicine and Health Sciences,
Macquarie University,
Sydney NSW 2109, Australia
e-mail: ashkan.javadzadegan@mq.edu.au

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received January 11, 2018; final manuscript received February 26, 2019; published online April 16, 2019. Assoc. Editor: Ali Khounsary.

J. Heat Transfer 141(6), 062403 (Apr 16, 2019) (10 pages) Paper No: HT-18-1021; doi: 10.1115/1.4043163 History: Received January 11, 2018; Revised February 26, 2019

In this paper, effect of Joule heating (JH), viscous dissipations (VD), and super hydrophobic surfaces on heat transfer of water–Al2O3 and water–CuO nanofluids in a microchannel has been investigated using lattice Boltzmann method (LBM). The microchannel is under a uniform and transverse magnetic field. The lower wall of the microchannel is insulated and a uniform heat flux has been applied to the upper wall. Results are generated at constant Reynolds number of 150, volume fraction of 2%, and a diameter of 25 nm with variable Hartmann numbers ranging from 0 to 20 and nondimensional slip coefficients from 0 to 0.05. The results of the developed code are in good agreement with other analytical, numerical, and experimental reports. Moreover, the results show that in such case, ignoring the JH and VD leads to a significant error in the prediction of Nusselt number up to 62% and 56%, respectively, for water–Al2O3 and water–CuO nanofluids. It has also been shown that using a super hydrophobic surface with a slip coefficient of 0.05 leads to a significant reduction in VD; however, it increases the effect of JH. On the other hand, it is found that, despite JH and viscous dissipation effects, using super hydrophobic surfaces (up to a slip coefficient of 0.05) leads to an increase in Nusselt number and decrease in shear stress for all the studied Hartmann numbers. Finally, it has been concluded that super hydrophobic surfaces can be used as a passive tool to enhance the heat transfer rate and simultaneously decrease the pumping power demand.

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Figures

Grahic Jump Location
Fig. 1

(a) Geometry of the problem and the boundary conditions and (b) lattice links between nodes in D2Q9 lattice model

Grahic Jump Location
Fig. 2

(a) Comparison of the developed velocity in various Hartmann numbers in present work with the analytical solution in Refs. [14] and [32] and (b) comparison of the developed temperature profile in the present work with the analytical solution for various slip coefficients [43]

Grahic Jump Location
Fig. 3

The dimensionless temperature profiles at three different cross sections in the Hartmann numbers of 0 and 10 and in slip coefficients of 0 and 0.05 for water–Al2O3 nanofluid

Grahic Jump Location
Fig. 4

The average Nusselt number for water–Al2O3 and water–CuO nanofluids versus Hartmann number studied in slip coefficients of 0 and 0.05 and heat fluxes of 100 and 250 kW/m2 for three different cases of: considering JH and VD, just considering the VD, and ignoring both the JH and viscous dissipation

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