SONGKLANAKARIN JOURNAL OF SCIENCE & TECHNOLOGY

Volume 41, No. 04, Month JULY, Year 2019, Pages 915 - 923

Numerical simulation of heat transfer over a torus rotating about its centerline

Jakgrit Sompong and Pairin Suwannasri

Abstract Download PDF

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 40 Re   ; Prandtl number 0 7 100 . Pr   ; rotational speed 0 1 9 .    ; and fixed aspect ratio 2Ar . 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.

Keywords

heat transfer, rotating torus, viscous incompressible fluid, axisymmetric flow

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