溢流式布膜铝板液膜厚度和润湿特性实验研究

万智华 1; 2; 厉彦忠 1; 苏长满 2

doi:10.7652/xjtuxb202004005

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溢流式布膜铝板液膜厚度和润湿特性实验研究

更新时间：2025-07-09

- 溢流式布膜铝板液膜厚度和润湿特性实验研究
- Experimental Study on Thickness and Wetting Characteristics of Liquid Film on Aluminium Plate with Overflow Type Distributor
- 西安交通大学学报 2020年54卷第4期页码：35-43
- 作者机构：
  
  1. 西安交通大学能源与动力工程学院,西安,710049
  2. 江苏建筑职业技术学院建筑智能学院,江苏,徐州,221116
- 作者简介：
- 基金信息：
  
  : 2019-09-04。作者简介: 万智华(1990-),男,博士生;厉彦忠(通信作者),男,教授,博士生导师。基金项目: 江苏省住房和城乡建设厅科技计划资助项目(2016ZD56)
- DOI：10.7652/xjtuxb202004005
  中图分类号： TK124;TB657.5;TQ051.6
- 网络首发：2020-04-10，
  
  纸质出版：2020
- 稿件说明：
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万智华 1, 2, 厉彦忠 1, 等. 溢流式布膜铝板液膜厚度和润湿特性实验研究[J]. 西安交通大学学报, 2020,54(4):35-43.

Experimental Study on Thickness and Wetting Characteristics of Liquid Film on Aluminium Plate with Overflow Type Distributor[J]. 2020, 54(4): 35-43.
万智华 1, 2, 厉彦忠 1, 等. 溢流式布膜铝板液膜厚度和润湿特性实验研究[J]. 西安交通大学学报, 2020,54(4):35-43. DOI： 10.7652/xjtuxb202004005.

Experimental Study on Thickness and Wetting Characteristics of Liquid Film on Aluminium Plate with Overflow Type Distributor[J]. 2020, 54(4): 35-43. DOI： 10.7652/xjtuxb202004005.

摘要

为了探索高雷诺数(Re>700)时平板降膜厚度规律和溢流式布膜方式下的润湿特性

设计并搭建了垂直铝板降膜实验台

采用电容测厚技术测量了Re为660～1 390时冷态水膜瞬时厚度的变化情况。利用文献数据着重分析了流动长度和Re对平均液膜厚度的影响

并通过图像处理法计算了加湿过程的润湿面积。实验结果表明:在研究工况范围内

随着Re的增大

液膜厚度的最大值、最小值、平均值、标准偏差、波动振幅均存在上升趋势; 不同流动长度处液膜厚度存在较大差异

拟合出流动长度L为0.43 m处的平均液膜厚度的经验关联式

计算值和实验值的相对误差控制在±6%范围内; 层流向紊流转换的临界Re约为500

临界Re之后的平均液膜厚度随Re的增长速率要高于之前的; 在Re为15～200时

润湿比随着Re增加呈现波动增大的趋势

预测平板最小润湿流量约为0.27。

Abstract

A test rig based on falling film on the vertical aluminium plate is designed and built to obtain the film thickness characteristics under high Reynolds number(Re>700)on the plate and the wetting properties with overflow type distributor. The instantaneous film thickness of cold water without heating is measured by the capacitance probe technology under Re ranging from 660 to 1 390. Effects of flow length and Re on the average film thickness are emphatically analy-ed by comparing with literature data. The wetted area in wetting process is measured by the image processing technology. Experimental results show that the maximum value

minimum value

mean value

standard deviation and fluctuation amplitude of liquid film thickness all show an upward trend with the increase of Re within the studied Re conditions. The thickness of liquid film varies greatly at different flow lengths. An empirical correlation of average liquid film thickness at flow length 0.43 m is obtained by fitting

and

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