摘要
在低质量流速和高热流密度下,对深度为30μm的微通道内的流动沸腾进行了实验研究,发现了毫秒级周期性喷射流型、液膜的波动及液丝的断裂现象。分析表明,喷射周期的长短与沸腾数(Bo)有关,界面非平衡蒸发导致液丝失稳及液膜波动;微通道宽度方向上的Marangoni效应引起液膜和液丝的收缩、波动及断裂。
The transient flow patterns of flow boiling in a microchannel with the depth down to thirty microns were studied at low mass fluxes and high heat fluxes. The periodic jet flow in the timescale of milliseconds, the wavy flow of liquid film and the rupture of liquid thread were identified. It is analyzed that the boiling numbers are responsible for the different durations of cycle period of the jet flow. The non-equilibrium interfacial evaporation is the reason for the instability of liquid thread and the waviness of liquid film. The Marangoni effect in the width direction of the microchannel leads to the thinning and waviness of the liquid film, the rupture of the liquid thread.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2009年第2期291-294,共4页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No．50776089)
