十字形管路内の流れおよび熱伝達 : 第2報,乱流場の数値解析

概要

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Calculations were carried out for fully-developed turbulent flows within ducts of a cross-shaped cross-section, using the numerical method previously proposed for laminar flow predictions. The Reynolds stress driven secondary flows were simulated successfully by the Launder-Ying algebraic stress model coupled to the k-ε turbulence model. A parametric study was made on the friction and heat transfer characteristics in terms of the parameter α associated with the dercease in the cross-sectional area (namely, α=0 for a square duct, and α→1 for parallel plates). Through performance evaluations, it has been found that when increasing α (i. e. decreasing the cross-sectional area), both the Reynolds analogy factor and the heat transfer coefficient under equal pumping power decrease slightly, while the heat transfer coefficient obtained with the equal mass flow rate increases appreciably, indicationg a possible heat transfer enhancement.
一般社団法人日本機械学会の論文
1986-05-25