短脉冲激光作用下爆发沸腾的温度及汽泡行为研究  

Temperature and vapor bubble behavior while explosiveboiling under effect of short-pulse laser heating

作　　者：金仁喜[1] 淮秀兰[2] 刘登瀛[2] 

机构地区：[1]海军潜艇学院,山东青岛266071 [2]中国科学院工程热物理研究所,北京100080

出　　处：《海军工程大学学报》2003年第2期6-10,共5页Journal of Naval University of Engineering

基　　金：国家重点基础研究发展规划项目(G2000026305)

摘　　要：采用短脉冲激光加热浸没在丙酮液池的铂薄膜电阻的方法,以及高压电火花单次放电高速照相技术,在国内首次建立了超急速爆发实验台,达到了微秒级的温度频响和2×106帧/s的高速照相.研究发现,随着激光热流密度增加,试件表面温度快速升高到一饱和值,与过热液体的动力学理论极限温度非常接近.拍摄到了与常规沸腾很不相同的蘑菇云式爆发沸腾照片.试件表面及临近表面的微薄液层内瞬间爆发生成大量大小相当的细小汽泡,汽泡脱离直径远低于经典Fritz公式计算值,上浮速度先快后慢.The extremely transient explosive boiling experimental system is established firstly in China by applying film\|heating method with 1 μs temperature response and high\|speed photography of 2×106 f/s. With the increase of laser heat flux, the temperature of heater increases rapidly to the saturated value which is very close to theoretical kinetic limit of superheat. Phtograph of the mushroom\|like explosive boiling far different from normal boiling is taken. A great number of tiny vapor bubbles is generated concurrently on the surface of heater and the thin liquid layer adjacent to heater. The departure diameter of vapor bubble is far less than the calculated value which is predicted by the classical Fritz equation. Vapor bubbles float up from fast to slow.

关 键 词：短脉冲激光 爆发沸腾 温度 汽泡行为 过热极限 实验 

分 类 号：O552.422[理学—热学与物质分子运动论]