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饱和水喷流沸腾临界热流密度的理论模拟

发表时间:2010-07-31  浏览量:1098  下载量:565
全部作者: 刘振华,秋雨豪,李元阳
作者单位: 上海交通大学机械与动力工程学院
摘 要: 基于宏观微层结构中汽柱下的微层失稳导致临界热负荷产生的机理,建立一个物理模型用于预示滞止区内饱和水喷流沸腾的临界热流密度。根据长波稳定性理论,得到了高温平板上不同固液接触角条件下的气泡底部最大的液膜底层厚度。结合普通铜表面上滞止区内喷流沸腾的实验数据,建立一个预示沸腾临界热流密度(critical heat flux,CHF)的半经验半理论关系式,重点研究固液接触角对CHF的影响。得到的关系式揭示了固液接触角、喷流冲击速度和喷流直径对CHF的综合影响。
关 键 词: 传热学;喷流;沸腾;临界热流密度;固液接触角
Title: The theoretical simulation on critical heat flux of saturated water jet impingement boiling on stagnation zone
Author: LIU Zhenhua, QIU Yuhao, LI Yuanyang
Organization: School of Mechanical Engineering, Shanghai Jiaotong University
Abstract: A theoretical simulation was carried out for predicting the critical heat flux (CHF) of convective boiling for a round saturated water jet impingement on the stagnation zone of a hot surface. The study was focused on the effect of the solid�liquid contact angle on the CHF. A theoretical model based on the long wave stability was applied to calculate the maximum liquid sub�film thickness under boiling bubbles and finally a semi�empirical and semi�theoretical correlation was proposed by combining the simulated calculation and the experimental data from the common metal heating surface. The correlation revealed the comprehensive effects of solid�liquid contact angles, jet velocity and jet diameter on the CHF and agreed well with the experimental data proposed by authors in the previous study.
Key words: heat transfer; jet impingement; boiling; critical heat flux; solid�liquid contact angle
发表期数: 2010年7月第14期
引用格式: 刘振华,秋雨豪,李元阳. 饱和水喷流沸腾临界热流密度的理论模拟[J]. 中国科技论文在线精品论文,2010,3(14):1423-1429.
 
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