【摘要】 <正> 一、前言实验表明,由于存在管间的汽液两相运动,水平管束沸腾换热的机理与水平单管有明显的差别。为了解释管束与单管沸腾特征的差异,人们已提出了循环模型和液膜蒸发模型。对于强化管组成的管束,实验结果还存在着较大的分岐。本文把管束与单管沸腾特性的差别,归结为存在一个管束效应。文中对管束效应的物理机制进行了系统的分析和实验研究。更多还原

【Abstract】 The mechanism of the bundle effect of a horizontal tube bundle in nucleate pool boiling heat transfer was investigated theoritically and experimentally. It is shown that the liquid film effect, impinging effect and vapor covering effect caused by rising bubbles and two-phase circulation in the bundle are the main mechanisma of the boiling enhancement in the tube bundle. The experimental investigation with a 9-tube bundle made by plan or finned tubes were conducted.更多还原