Abstract:
In this study, the e ects of temperature dependent viscosity on magnetohydrodynamic
natural convection
ow past an isothermal sphere are determined. The uniformly heated
sphere is immersed in a viscous and incompressible
uid where viscosity of the
uid is taken
as a non-linear function of temperature. The Partial Di erential Equations governing the
ow are nonlinear in nature, thus,they are transformed into non dimensional form and
solved using the Direct Numerical Scheme and implemented in matrix Laboratory. The
numerical results obtained are presented graphically and in a table and are discussed. In
this study, it has been observed that increasing the Magnetic parameter leads to a de-
crease in velocity, temperature, skin friction and the rate of heat transfer. It has also been
noted that increase in the Grashof number leads to an increase in velocity and tempera-
ture whereas increase in the values of viscous variation parameter leads to an increase in temperature but there is a decrease in velocity. These results are useful in engineering,technology and biomedical fields.
