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

Abstract

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.

Numerical investigation of the thermo‐hydraulic performance of water‐based nanofluids in a dimpled channel flow using Al2O3, CuO, and hybrid Al2O3–CuO as nanoparticles

“…Difference of the mean temperature between present study and the study of 71,83 (A) Re = 750 and (B) Re = 1250 [Color figure can be viewed at wileyonlinelibrary.com]…”

“…Table 1 represents the properties of nanoparticles at 298K. Tables 2–4 71 represent the thermo‐physical properties at 298K for three different nanofluids considered in this study.…”

Slip flow of Carreau fluid over a slendering stretching sheet with viscous dissipation and Joule heating

“…They found that the shear stress decreases with the intensification of Lorentz forces. Recently, several researchers [42][43][44] contributed to the work on different flows accompanied with Ohmic (Joule) heating and viscous dissipation.…”

Numerical hybrid thermal MRT-LBM for condensation and boiling phenomena on horizontal walls of different wettability

“…This is a new area of study for the LBM community and it is used in various applications such as boilers for motor power generation, condensers in power plants and applications in petrochemical processes, etc. The small dimensional requirements associated with the cooling of electronic equipment have produced new challenges at the micro and mesoscale levels in boiling and condensation phenomena as well (Rohsenow 1951, Moore and Mesler 1961, Nukiyama 1966, Collier and Thome 1994, Chaabane et al 2017, Huo and Rao 2018, Alipour Lalami et al 2019, Pawar et al 2019, Mondal and Bhattacharya 2021, Xu and Zhou 2021. Different models are adopted to study these problems (Bhardwaj and Dalal 2017, Qian et al 1992, Hou et al 1997, Zou and He 1997, Quan et al 2011, Gong and Cheng 2012, Jung et al 2014, Kim et al 2016, Chaabane et al 2017, Cheng et al 2017, Huo and Rao 2018, Rao et al 2018, Pawar et al 2019, Zhao et al 2020.…”