微结构壁面降膜波动的统计特性  

Statistical Characteristics of Wavy Falling Films over Micro Textured Surfaces

作　　者：袁猛[1] 胡剑光[1] 陈剑佩[1] 戴干策[1] 

机构地区：[1]华东理工大学化学工程联合国家重点实验室,上海200237

出　　处：《华东理工大学学报（自然科学版）》2012年第3期293-300,共8页Journal of East China University of Science and Technology

摘　　要：采用非接触测量法,考察了以水为实验体系,中等雷诺数Re为30～200,卡比萨数K_a=6.23×10^(10),刻有竖条纹和菱形条纹微结构壁面上液膜的波动统计特性,如平均液膜厚度、标准方差、波动振幅量纲一液膜衬底厚度、波动频率等,并与光滑不锈钢板上液膜特性进行比较,结果表明:即使在微结构壁面,液膜波动同样存在光滑进口区,微结构壁面上液膜的平均液膜厚度、波动振幅和波动频率均大于光滑不锈钢板,微结构壁面和光滑不锈钢板上液膜波动性的演变趋势沿流动方向及随Re变化均基本一致。The statistical characteristics of falling films over surfaces with two different textures of vertical and diamond-shaped grooves on aluminum plate were studied at intermediate Reynolds numbers （30〈Re〈200） and high Kapitza numbers （Ka=6. 23× 10^10） in water system by non-contact measurement. The average film thickness, standard deviation, average amplitude, and fluctuation frequency were experimentally determined and compared with those of smooth stainless steel plate. The results show that there exists a smooth entrance region on falling films even if over textured surface and the average film thickness, the average amplitude and wave frequency are larger than those over smooth stainless steel plate. Along the falling film flow direction, the falling film over texture surface exhibits roughly the same evolution tendency with the change of Re in contrast to the smooth stainless steel plate.

关 键 词：微结构 统计特性 光滑进口区 波动 

分 类 号：TQ021.1[化学工程]