【摘要】 分析研究了在底部封闭矩形通道内逆流汽液两相流条件下的临界热流密度的发生机理。研究表明,临界热流密度与流入矩形通道内的最大下降液体流量相对应,并且临界热流密度可通过求解动量方程、包络线和能量方程得到。通过与日本数土幸夫建立的模型、经验关联式和实验数据比较,该模型可在精度±30 %范围内预测底部封闭矩形通道条件下的临界热流密度。更多还原

【Abstract】 An analytical study has been done on the critical heat flux (CHF) in the rectangular channel with a closed bottom, in which a liquid film and a vapor flow exist in a countercurrent annular flow. It is proved that the CHF point corresponds to a maximum falling liquid rate fed into the rectangular channel with a closed bottom, which can be determined from momentum, its partial derivation with void fraction and energy balance equations. Comparing with Sudos model the empirical correlation and the existing experimental data, the CHF in this model can be predicted with an accuracy of ±30 % in the rectangular channel with a closed bottom.更多还原