摘要
本文以水平微圆管内气液两相环状流气液界面为研究对象,通过分析重力、表面张力和界面剪切力对环状流液膜厚度的影响,重点考虑Rayleigh不稳定性对气液界面的依存关系,得到了不同管径和气核直径变化时不稳定性的变化规律,并分析拟合了最危险波长和气核直径的关联式,为后续建立高热流密度条件下微通道内强化传热理论模型奠定基础.
The behaviors of gas-liquid interface associate with two-phase annular flow regime in horizontal micro tubes are investigated with linear stability analysis. A model of gas-liquid interface is developed relied on Rayleigh instability, in which effects of gravity force, surface tension and interface shear on film thickness are considered. From numerical simulation results based on variable tube diameter and gas-core diameter of annular flow, a correlation of the most instable wave length related to gas-core diameter is proposed. This will be useful for understanding the mechanism of enhanced heat transfer of micro-channel under high heat flux.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2008年第4期625-627,共3页
Journal of Engineering Thermophysics
基金
国家自然科学基金项目资助(No．50676077，No．50521604，No．50536020)
关键词
微圆管
环状流
气液界面
不稳定性
micro-tube
annular flow
gas-liquid interface
instability
