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RESEARCH PAPERS: Forced Convection

Swirling Effects on Laminarization of Gas Flow in a Strongly Heated Tube

[+] Author and Article Information
S. Torii

Department of Mechanical Engineering, Kogoshima University, 1-21-40 Korimoto, Kagoshima 890, Japan

W.-J. Yang

Department of Mechanical Engineering and Applied Mechanics, University of Michigan, Ann Arbor, MI 48109

J. Heat Transfer 121(2), 307-313 (May 01, 1999) (7 pages) doi:10.1115/1.2825981 History: Received May 20, 1998; Revised November 06, 1998; Online December 05, 2007

Abstract

A numerical study is performed to investigate thermal transport phenomena in a process of laminarization from a turbulent flow in a strongly heated circular tube in coaxial rotation. The k-ε turbulence and t2 -εt , heat transfer models are employed to determine the turbulent viscosity and eddy diffusivity for heat, respectively. The governing boundary layer equations are discretized by means of a control-volume finite difference technique and numerically solved using a marching procedure. When the tube is at rest, it is disclosed that: (i) when laminarization occurs, the streamwise velocity gradient at the wall is diminished along the flow, resulting in a substantial reduction in the turbulent kinetic energy over the whole tube cross section, (ii) the attenuation causes a deterioration in heat transfer performance, and (iii) simultaneously, both the turbulent heat flux and temperature variance diminish over the whole tube cross section in the flow direction. However, the presence of tube rotation contributes to the promotion of laminarization of gas flow. The mechanism is that a reduction in the velocity gradient induced by tube rotation suppresses the production of turbulent kinetic energy, resulting in an amplification in laminarizing the flow process.

Copyright © 1999 by The American Society of Mechanical Engineers
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