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MHD effect on the critical temperature differences
of oscillatory thermocapillary convection in two-layer fluid system |
| Hulin HUANG,Xiaoming ZHOU, |
| Academy of Frontier
Science, Nanjing University of Aeronautics and Astronautics, Nanjing
210016, China; |
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Abstract The effect of different directional magnetic fields on critical temperature differences of oscillatory thermocapillary convection in a rectangular cavity with differentially heated side walls filled with two viscous, immiscible, incompressible fluids is simulated in the absence of gravity. In this two-layer fluid system, the upper layer fluid is the electrically non-conducting encapsulant boron oxide (B2O3), while the lower one is the electrically conducting molten indium phosphide (InP). The interface between the two fluids is assumed to be flat and non-deformable. The computational results show that all the magnetic fields along the x, y and z directions can delay the transition from steady convection to oscillatory convection, and critical temperature differences increase with an increasing Hartmann number. Furthermore, the effect of a magnetic field along the z direction is strongest, followed by that along the y direction, and that along the x direction is the weakest for the same intensity of the magnetic field.
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| Keywords
magnetohydrodynamic
magnetic fields
thermocapillary convection
critical temperature difference
oscillatory convection
two-layer fluid system
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Issue Date: 05 June 2010
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