CONVECTION HEAT TRANSFER AND MAGNETOHYDRODYNAMICS STABILITYOF SWIRLING FLOWS IN CYLINDRICAL CONTAINER
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Date
2014
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جامعة الوادي - university of el oued
Abstract
In the present work, a study of the mixed convection flow of low Prandtl number fluid (
Pr 0.015 ) confined in a cylindrical container having an aspect ratio equal to 2, with and
without magnetic fields, has been considered. The finite volumes method has been used to resolve
the equations of continuity, momentum (or Navier-Stokes), energy and electric potential. In the
absence of magnetic field, the numerical results obtained show the appearance of
oscillatory instabilities for the values of the critical Reynolds number
Re 2575,924,802, cr and606 , corresponding respectively to the values of the Richardson
number Ri 0, 0.5, 1.0 and 2.0. However, in the presence of the vertical magnetic field, the fluid
continues its stable flow until the values of Reynolds number greater than those predictable
to have oscillatory instabilities. Stability diagrams have been established according to the numerical
results of this investigation. These diagrams put in evidence the dependence of the critical Reynolds
number and critical frequency of oscillations with the increase of the Hartmann number for various
values of the Richardson number. In conclusion, the stabilizing technique of the mixed
convection flows of fluids having low Prandtl number (semiconductors) by the application of an
external magnetic field is practically reliable.
Description
Article
Keywords
mixed convection, magnetic field, instabilities, heat transfer
Citation
Boukhari, A. Khechekhouche,A. Bessaih, R. CONVECTION HEAT TRANSFER AND MAGNETOHYDRODYNAMICS STABILITYOF SWIRLING FLOWS IN CYLINDRICAL CONTAINER. International Journal of Chemical and Petroleum Sciences. Vol 031. No 02.00/00/2014.faculty of technology. university of el oued. [visited in ../../….]. available from [copy the link here]