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RESEARCH PAPERS: Forced Convection

Numerical Prediction of Transitional Features of Turbulent Forced Gas Flows in Circular Tubes With Strong Heating

[+] Author and Article Information
K. Ezato

Kyushu University, Fukuoka, and Japan Atomic Energy Research Institute, Ibaraki, Japan

A. M. Shehata

Xerox Corporation, Webster, NY

T. Kunugi

Kyoto University, Kyoto, and Japan Atomic Energy Research Institute, Ibaraki, Japan

D. M. McEligot

Idaho National Engineering and Environmental Laboratory/LMITCo, Idaho Falls, ID, and University of Arizona, Tucson, AZ

J. Heat Transfer 121(3), 546-555 (Aug 01, 1999) (10 pages) doi:10.1115/1.2826015 History: Online December 05, 2007

Abstract

In order to treat strongly heated, forced gas flows at low Reynolds numbers in vertical circular tubes, the k-ε turbulence model of Abe, Kondoh, and Nagano (1994), developed for forced turbulent flow between parallel plates with the constant property idealization, has been successfully applied. For thermal energy transport, the turbulent Prandtl number model of Kays and Crawford (1993) was adopted. The capability to handle these flows was assessed via calculations at the conditions of experiments by Shehata (1984), ranging from essentially turbulent to laminarizing due to the heating. Predictions forecast the development of turbulent transport quantities, Reynolds stress, and turbulent heat flux, as well as turbulent viscosity and turbulent kinetic energy. Overall agreement between the calculations and the measured velocity and temperature distributions is good, establishing confidence in the values of the forecast turbulence quantities—and the model which produced them. Most importantly, the model yields predictions which compare well with the measured wall heat transfer parameters and the pressure drop.

Copyright © 1999 by The American Society of Mechanical Engineers
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