华南理工大学学报(自然科学版) ›› 2003, Vol. 31 ›› Issue (7): 42-47.

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场协同理论对充分发展湍流传热性能的数值分析(英文)

陈颖 邓先和 丁小江 王杨君   

  • 出版日期:2003-07-20 发布日期:2022-09-26
  • 基金资助:
    国家重点基础研究项目(G2000026301)

A Numerical Analysis of Thermal Characteristics of Fully- developed Turbulent Flow with the Field Synergy Theory

  • Online:2003-07-20 Published:2022-09-26

摘要: 在充分发展的湍流流动中,时均温度梯度和时均速度矢量间的夹角θ是控制其对流换热强度的重要因素之一。本文通过对两种异型管——横纹管和缩放管的数值模拟,得出:雷诺数Re恒定时,流向方向上T·cosθ的变化规律与局部Nu数的分布规律相似.改变几何参数,如肋高或收缩段的长度,可改变θ角的分布。

关键词: 传热, 充分发展湍流, 场协同理论, 异形管

Abstract: The angle θbetween dimensionless time-averaged temperature gradient and velocity vector is one of the main factors to dominate the heat transfer ability of fully-turbulent flow. Numerical investigations are carried out to examine the angle in a 2-D flow passage of two kinds of tubes, transversely corrugated and convergent-divergent tube. The calculated results indicate that the variations of T / cos θ are similar to the local Nusselt number along the stream-wise direction while Reynolds number is constant. The geometrical parameters, for example, rib height or converging length can change the angleθ

Key words: heat transfer, fully-turbulent, field-synergy theory, hetero-shaped tube