Abstract:
Mixed convection flow and heat transfer characteristics of non-Newtonian fluid flowing
around a long square cylinder under the influence of aiding buoyancy are investigated in the
vertical unconfined configuration for the Reynolds number (Re) = 75 - 150, power-law index (n)
= 0.2 - 1 and Richardson number (Ri) = 0 - 1 for a constant Prandtl number (Pr) = 50. The values
of both Drag coefficient and Nusselt number increase with Richardson number. Drag coefficient
is observed to decrease with increase in Reynolds number but Nusselt number shows an opposite
behavior i.e. it increases with Reynolds number. In the present range of conditions, the flow of
shear-thinning fluids is truly pseudo-periodic in nature at high Reynolds numbers and/or at small
values of power-law index (highly shear-thinning fluids).
