Abstract:
In this work the steady flow of power law fluids across a pair of circular tandem cylinder has been
studied numerically. The governing equations has been solved by FVM based solver FLUENT. In
this work the effects of Power Law Index (0.2 to 1.8), Reynolds Number (1 To 40), Prandtl Number
(1 to 100), Gap Ratio (2 to 10) and Richardson number (0 to -3) and their effect on local ang global
characteristics such as streamlines, vorticity profile, isotherm velocity between two cylinder and
pressure coefficient has been studied numerically. With increase in the shear thinning effect that is
increasing the n the separation of flow took a longer time whereas the early flow separation
occurred in case of power law index equal to 1 or less than 1.the pressure coefficient on the surface
of cylinder showed a close relation with power law index, Reynolds Number and gap ratio but the
effect of Richardson Number did not alter it significantly. The nusselt Number showed a close
correlation with the Reynolds Number and Prandtl Number. The changes in Prandtl Number
affected Nusselt Number significantly but it’s effect on other coefficient such as Drag Coefficient
and pressure coefficient were not significant precisely it did not alter these values a little bit but
when Richardson Number Became negative it showed a little change. The drag coefficient values of
individual cylinders came out to be smaller than the values of single Cylinder. The downstream
cylinder was critically afeected by the changes in Gap Ratio. As the gap ratio was kept smaller i. e.
2 or four the effects of upstream cylinder was high on downstream cylinder but for higher values of
gap ratio the downstream cylinder started behaving like individual circular cylinder. The effect of
change of Richardson number can be easily seen in the streamline, vorticity and isotherm profiles.
