A parametric study is implemented to study the impact of inflow conditions, rheology, and thermo-physical properties on the flow and heat transfer behavior of suddenly expanding, recirculating, and non-recirculating, viscoplastic non-Newtonian flows. The governing mass and fully-elliptic partial differential equations of motion and energy along with the Bingham constitutive equations are numerically solved to provide accurate predictions of the velocity and temperature fields. The expansion ratio was fixed at 2. Inflow conditions, yield stress presence, and transitioning from a non-recirculating to a recirculating viscoplastic flow regime are found to have a strong influence on the overall heat transfer characteristics downstream the expansion plane.

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