The heat transfer characteristics of axisymmetric flow past a rotating torus in viscous incompressible fluid have been investigated numerically. The torus surface rotates about its centerline with constant velocity. The governing equations in a toroidal coordinate system are solved by using a finite difference method for ranges of parameters: Reynolds number 20 ≤ Re ≤ 40 ; Prandtl number 0.7 ≤ Pr ≤ 100 ; rotational speed 0 ≤ α ≤ 1.9 ; and fixed aspect ratio Ar = 2. The heat transfer characteristics are presented in terms of the isotherm patterns, local Nusselt numbers, and average Nusselt numbers. Variation of the local Nusselt number on the torus surface shows the effect of the Prandtl number and rotational speed on heat transfer from a torus in the flow regime. Torus rotation is an efficient Nusselt number reduction or torus surface temperature enhancement technique.
