CHF Phenomena by Photographic Study of Boiling Behavior due to Transient Heat Inputs
CHF Phenomena by Photographic Study of Boiling Behavior due to Transient Heat Inputs
复制标题
通过摄影研究瞬态热输入引起的沸腾行为来观察 CHF 现象
DOI：
10.1155/2012/248923
复制
发表时间：
2012
影响因子：
1.1
通讯作者：
Qiusheng Liu
中科院分区：
文献类型：
--
作者：
Jongdoc Park;Katsuya Fukuda;Qiusheng Liu
采用直径为1.0 mm的水平圆柱形实验加热器，研究了在宽压力和过冷度范围内，水和高润湿性液体（如乙醇和FC-72）在不同速率下以指数方式增加热输入时的瞬态沸腾传热特性。临界热通量（CHF）值的趋势与周期被分为三组。CHF属于第一组，具有较长的周期发生与充分发展的核沸腾（FDNB）传热过程。对于周期较短的第二组，从非沸腾到膜沸腾的直接转变以爆发沸腾的形式发生。在CHF下，从非沸腾状态到膜沸腾的直接沸腾转变在没有热通量增加的情况下发生。实验结果表明，液体的性质和润湿性对初始沸腾行为有重要影响。使用高速摄像系统对过渡到薄膜沸腾期间的汽泡行为进行了摄影观察。
The transient boiling heat transfer characteristics in a pool of water and highly wetting liquids such as ethanol and FC‐72 due to an exponentially increasing heat input of various rates were investigated using the 1.0 mm diameter experimental heater shaped in a horizontal cylinder for wide ranges of pressure and subcooling. The trend of critical heat flux (CHF) values in relation to the periods was divided into three groups. The CHF belonging to the 1st group with a longer period occurs with a fully developed nucleate boiling (FDNB) heat transfer process. For the 2nd group with shorter periods, the direct transition to film boiling from non boiling occurs as an explosive boiling. The direct boiling transition at the CHF from non‐boiling regime to film boiling occurred without a heat flux increase. It was confirmed that the initial boiling behavior is significantly affected by the property and the wettability of the liquid. The photographic observations on the vapor bubble behavior during transitions to film boiling were performed using a high‐speed video camera system.