Abstract
The effect of temperature dependent viscosity on the onset of Marangoni-Bénard ferroconvection under microgravity conditions in a horizontal ferrofluid layer in the presence of a uniform vertical magnetic field has been studied. The viscosity is considered to be varying exponentially with temperature. The lower rigid and the upper horizontal free boundaries are considered to be perfectly insulated to temperature perturbations. The resulting eigenvalue problem is solved numerically using the Galerkin technique as well as analytically by regular perturbation technique with wave number a as a perturbation parameter. It is observed that the analytical results agree well with those obtained numerically. The characteristics of stability of the system are strongly dependent on the viscosity parameter B. It is found that increase in the viscosity parameter B has a stabilizing effect on the onset of Marangoni-Bénard ferroconvection. Moreover, the nonlinearity of fluid magnetization M 3 is observed to have no consequence on the onset of convection in the case of fixed heat flux boundary conditions.
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Nanjundappa, C.E., Shivakumara, I.S. & Arunkumar, R. Onset of Marangoni-Bénard Ferroconvection with Temperature Dependent Viscosity. Microgravity Sci. Technol. 25, 103–112 (2013). https://doi.org/10.1007/s12217-012-9330-9
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DOI: https://doi.org/10.1007/s12217-012-9330-9