【作者】 毛峰； 田瑞峰； 陈怡炫；

【Author】 MAO Feng;TIAN Rui-feng;CHEN Yi-xuan;Fundamental Science on Nuclear Safety and Simulation Technology Laboratory,Harbin Engineering University;

【机构】 哈尔滨工程大学核安全与仿真技术国防重点学科实验室；

【摘要】 对波形板干燥器发生二次携带现象的临界条件进行了实验研究,实验中,先结合可视化试验台和平面激光诱导荧光剂法,对波形板通道内壁面上自由下降液膜厚度进行测量,在此基础上研究了发生二次携带的临界条件。研究表明横截面上下降液膜厚度不均匀,随着液膜流量的增大,横截面液膜高度的极大值从边缘两侧逐渐向中心区域移动,且下降液膜横截面平均厚度在不同的高度位置上逐渐增大,在液膜厚度与雷诺数的所呈的幂函数关系中增加了一个高度修正因子,使之与实验结果较好符合。在实验中的液膜厚度变化范围内,得出了液膜破裂的临界速度与厚度为负相关的关系。更多还原

【Abstract】 The mechanism of the re-entrainment phenomenon of the corrugated plate dryer was studied experimentally in this article.The thickness of the falling film on corrugated plate was measured on a visualization test bench with the Planar Laser Induce Fluorescent method.On this basis,the film critical rupture conditions was study.The results show that the thickness of the falling liquid film at the cross-section is not uniform,as the flow rate of the liquid film increases,the place of maximum value of the cross-section film gradually moves from edge area toward the central area.Furthermore,there is a power function relationship between the average thickness of the film and the Reynolds number,a modifying factor is added to make this power function more fit with experimental result.After measured the thickness of falling liquid film,the critical air velocity of re-entrainment in the corrugated plate dryer also was studied.In the variation range of the film thickness in this experiment,the critical velocity of the liquid film rupture was negatively correlated with the film thickness.更多还原