Study of Rotation Effect on Nanofluid Natural Convection and Heat Transfer by the Immersed Boundary-Lattice Boltzmann Method

Aiming to investigate the rotation effect on the natural convection and heat transfer of nanofluid, which has an important application in the control of heat transfer, the velocity field and temperature distribution inside the square cylinder with the rotating heat source in the center were numerica...

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Bibliographic Details
Published inEnergies (Basel) Vol. 15; no. 23; p. 9019
Main Authors Lai, Tianwang, Xu, Jimin, Liu, Xiangyang, He, Maogang
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.12.2022
Subjects
Boundary conditions
Computer applications
Computing time
Convection
Fluid flow
Free convection
Gravitational effects
Gravity effects
Heat conductivity
Heat transfer
IB-LBM
Magnetic fields
nanofluid
Nanofluids
Ratios
Reynolds number
Rotating cylinders
Rotation
rotation effect
Rotational motion
Temperature distribution
Transport theory
Velocity
Velocity distribution
Viscosity
China
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Summary:Aiming to investigate the rotation effect on the natural convection and heat transfer of nanofluid, which has an important application in the control of heat transfer, the velocity field and temperature distribution inside the square cylinder with the rotating heat source in the center were numerically studied and presented in detail at different Hartman numbers and aspect ratios using the immersed boundary-lattice Boltzmann method. Then, the average Nusselt number on the surface of the heat source was calculated to compare the heat transfer rate in different cases. The results showed that the rotation would reduce the effect of gravity on the flow and suppress the heat transfer between the rotating heat source and nanofluid, while the external magnetic field would reduce the rotation effect on the flow and suppress or promote the heat transfer depending on the rotational speed and aspect ratio. Moreover, the smaller aspect ratio of the heat source to the square cylinder would enhance the heat transfer rate and make the retarding effect of magnetic field on rotation more apparent. In addition, the dimensionless rotational speed was proposed in this work, by which much computational time could be saved during the calculation of the immersed-boundary lattice Boltzmann method for the problem of rotation.
ISSN:1996-1073
1996-1073
DOI:10.3390/en15239019