Marangoni凝结液珠脱离半径分析  

Droplet Departure Radii for Marangoni Condensation

作　　者：胡申华[1] 严俊杰[2] 王进仕[2] 

机构地区：[1]新疆大学电气工程学院 [2]西安交通大学能源与动力工程学院,陕西省西安市710049

出　　处：《中国电机工程学报》2011年第32期88-93,共6页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50966003);新疆大学博士启动基金(BS090147)~~

摘　　要：为研究宏观温度梯度对Marangoni凝结的影响,设计了一个截面为梯形的试验块。在大范围的酒精气相浓度条件下(0%～50%),用实验的方法研究了宏观温度梯度对Marangoni凝结的影响。对于每个浓度都在不同蒸汽流速和压力下进行了实验并拍摄凝结图片。以凝结实验中所拍摄的实验图片为分析对象,分析不同质量分数、过冷度和流速下的凝结液珠脱离半径。凝结液珠的脱离半径与表面过冷度、凝结表面的横向温差、酒精质量分数、蒸汽流速等因素有关。以纯水的脱离半径公式为基础,考虑温差带来的Marangoni效应和蒸气流速后,拟合出Marangoni凝结凝结液珠的最大脱离半径公式,在大部分过冷度的情况下,计算值与实验数据一致性较好,最大误差为23%。An oblique copper block,which created surface temperature gradient,was designed to experimentally study the effect of macroscopic temperature gradient on Marangoni condensation of ethanol–water vapor mixtures.The experiment was carried out under a wide range of concentrations（0%-50%）.For each concentration,the experiment was performed at different velocities and pressures.During the experiment condensation photographs were shot.Dropwise condensation departure radii was studied based on these photographs under the condition of different concentration,vapor-to-surface temperature difference and vapor velocity.The departure radii of dropwise condensation closely depended on the above factors.The correlation for the maximum departure radii of condensate drops was obtained on the basis of the formula for pure water vapor with velocity and Marangoni effect caused by condensation surface temperature difference.The calculation results are in good agreement with the experimental measurement over large vapor-to-surface temperature difference,and its maximum error is 23%.

关 键 词：水–酒精混合蒸气 MARANGONI凝结 脱离半径 珠状凝结 

分 类 号：TK121[动力工程及工程热物理—工程热物理]