Experimental Study on Thickness and Wetting Characteristics of Liquid Film on Aluminium Plate with Overflow Type Distributor

doi:10.7652/xjtuxb202004005

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Experimental Study on Thickness and Wetting Characteristics of Liquid Film on Aluminium Plate with Overflow Type Distributor

更新时间：2025-07-09

- Experimental Study on Thickness and Wetting Characteristics of Liquid Film on Aluminium Plate with Overflow Type Distributor
- Vol. 54, Issue 4, Pages: 35-43(2020)
- 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：
- DOI：10.7652/xjtuxb202004005
  CLC： TK124;TB657.5;TQ051.6
- Online First：10 April 2020，
  
  Published：2020
- 稿件说明：
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Experimental Study on Thickness and Wetting Characteristics of Liquid Film on Aluminium Plate with Overflow Type Distributor[J]. 2020, 54(4): 35-43.
DOI：

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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references

NUSSELT W. Die oberflachen kondensation des wasserdamfes [J]. Zeitsehrit des Vereines Deutscher Ingenieure, 1916, 60(5): 69-75.

阎维平, 叶学民, 李洪涛. 液体薄膜流的流动和传热特性 [J]. 华北电力大学学报(自然科学版), 2005, 32(1): 59-65.

YAN Weiping, YE Xuemin, LI Hongtao. Hydrodynamics and heat transfer of liquid thin film [J]. Journal of North China Electric Power University(Natural Science Edition), 2005, 32(1): 59-65.

LU Y, STEHMANN F, YUAN S, et al. Falling film on a vertical flat plate: influence of liquid distribution and fluid properties on wetting behavior [J]. Applied Thermal Engineering, 2017, 123: 1386-1395.

袁猛, 胡剑光, 陈剑佩, 等. 微结构壁面降膜波动的统计特性 [J]. 华东理工大学学报, 2012, 38(3): 293-300.

YUAN Meng, HU Jianguang, CHEN Jianpei, et al. Statistical characteristics of falling film fluctuation on the wall of [J]. Journal of East China University of Science and Technology, 2012, 38(3): 293-300.

暴凯, 胡珀, 黄兴冠. 可变角度大平板降膜流动特性的实验研究 [J]. 核科学与工程, 2015, 35(2): 379-384.

BAO Kai, HU Po, HUANG Xingguan. Experimental study of water film flow characteristics on the rotatable large flat plate [J]. Nuclear Science and Engineering, 2015, 35(2): 379-384.

YU Y Q, WEI S J, YANG Y H, et al. Experimental study of water film falling and spreading on a large vertical plate [J]. Progress in Nuclear Energy, 2012, 54(1): 22-28.

YU Y Q, CHENG X. Experimental study of water film flow on large vertical and inclined flat plate [J]. Progress in Nuclear Energy, 2014, 77(77): 176-186.

于意奇. 大尺度平板水膜流动行为的数值模拟和试验研究 [D]. 上海: 上海交通大学, 2012: 41-42.

HARTLEY D E, MURGATROYD W. Criteria for the break-up of thin liquid layers flowing isothermally over solid surfaces [J]. International Journal of Heat and Mass Transfer, 1964, 7(9): 1003-1015.

HOFFMANN A, AUSNER I, REPKE J U, et al. Fluid dynamics in multiphase distillation processes in packed towers [J]. Computers Chemical Engineering, 2005, 29(6): 1433-1437.

MORISON K R, WORTH Q A G, O’DEA N P. Minimum wetting and distribution rates in falling film evaporators [J]. Food and Bioproducts Processing, 2006, 84(4): 302-310.

GIANNETTI N, TRINURUK P, YAMAGUCHI S, et al. Film rupture and partial wetting over flat surfaces with variable distributor width [J]. Science and Technology for the Built Environment, 2019, 25(10): 1313-1324.

TAKAMASA T, HAZUKU T. Measuring interfacial waves on film flowing down a vertical plate wall in the entry region using laser focus displacement meters [J]. International Journal of Heat and Mass Transfer, 2000, 43(15): 2807-2819.

TAKAHAMA H, KATO S. Longitudinal flow characteristics of vertically falling liquid films without concurrent gas flow [J]. International Journal of Multiphase Flow, 1980, 6(3): 203-215.

LUO Y, WANG M, YANG H, et al. Experimental study of the film thickness in the dehumidifier of a liquid desiccant air conditioning system [J]. Energy, 2015, 84: 239-246.

ITO A, SASAKI M. Breakdown and formation of a liquid film flowing down an inclined plane: 1st report Measurement of contact angle and mechanism of film formation [J]. Transactions of the Japan Society of Mechanical Engineers: Part B, 1986, 52(475): 1261-1265.

AMBROSINI W, FORGIONE N, ORIOLO F. Statistical characteristics of a water film falling down a flat plate at different inclinations and temperatures [J]. International Journal of Multiphase Flow, 2002, 28(9): 1521-1540.

TAKAMASA T, KOBAYASHI K. Measuring interfacial waves on film flowing down tube inner wall using laser focus displacement meter [J]. International Journal of Multiphase Flow, 2000, 26(9): 1493-1507.

DROSOS E I P, PARAS S V, KARABELAS A J. Characteristics of developing free falling films at intermediate Reynolds and high Kapitza numbers [J]. International Journal of Multiphase Flow, 2004, 30(7): 853-876.

HENSTOCK W H, HANRATTY T J. The interfacial drag and the height of the wall layer in annular flows [J]. AIChE Journal, 1976, 22(6): 990-1000.

LUO Y, CHEN Y, ZHONG D, et al. Experimental study of the flow characteristics in a falling film liquid desiccant dehumidifier [J]. Science and Technology for the Built Environment, 2017, 23(1): 157-165.

张锋, 赵贤广, 耿皎, 等. Marangoni效应与降膜传递过程 [J]. 南京工业大学学报(自然科学版), 2006, 28(1): 93-99.

ZHANG Feng, ZHAO Xianguang, GENG Jiao, et al. Marangoni effects on the transfer process of the falling film liquid film [J]. Journal of Nanjing University of Technology(Natural Science Edition), 2006, 28(1): 93-99.

MIYASHITA T M K W K. Minimum wetting rate on wetted-wall column [J]. Journal of Chemical Engineering of Japan, 1975, 8(6): 440-444.

MORISON K R, TANDON G. Minimum wetting rates for falling films on stainless steel [J]. Developments in Chemical Engineering and Mineral Processing, 2006, 14(1/2): 153-162.

PARAMALINGAM S, WINCHESTER J, MARSH C. On the fouling of falling film evaporators due to film break-up [J]. Food Bioproducts Processing, 2000, 78(2): 79-84.

SIEBENECK K, POPOV W, STEFANAK T, et al. Pillow plate heat exchangers: investigation of flow characteristics and wetting behavior at single-flow conditions [J]. Chemie Ingenieur Technik, 2015, 87(3): 235-243.

HOFFMANN A, AUSNER I, REPKE J U, et al. Detailed investigation of multiphase(gas-liquid and gas-liquid-liquid)flow behaviour on inclined plates [J]. Transactions of the Institution of Chemical Engineers, 2006, 84(2): 147-154.

ISO Y, JIAN H, KATO M, et al. Numerical and experimental study on liquid film flows on packing elements in absorbers for post-combustion CO2 capture [J]. Energy Procedia, 2013, 37(3): 860-868.

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