超声脉冲反射法和激光吸收光谱法同步测量流动液膜厚度

CIESC Journal, 2018, 69(7): 2972-2978 ·2972·

化工学报 2018年第69卷第7期 | https://www.360docs.net/doc/776032630.html,

DOI ：10.11949/j.issn.0438-1157.20171251

苏明旭，Muhammad Abdul Ahad ，蒋永，吴威，杨荟楠

（上海理工大学能源与动力工程学院，上海 200093）

摘要：液膜流动现象在工业过程中广泛存在，对流动液膜厚度测量方法的测量研究至关重要。首先利用已知液膜

厚度的标准具（100～1000 μm ）对超声脉冲反射法和激光吸收光谱法精度进行验证；结果表明，超声脉冲反射法

测量液膜厚度的平均测量误差为1.07%，激光吸收光谱法测量液膜厚度的平均测量误差为1.29%。同时结合两种

方法对流动液膜进行研究，结果表明，当液膜在低速/中速/高速流动时，两种方法测量流动液膜的平均厚度吻合良

好，平均厚度差值分别为16.59、16.26、13.36 μm ，流动液膜厚度的标准方差的相对偏差分别为0.29%、7.71%、

25.37%，且在三种不同速度下两种方法测得在1s 的周期内液膜波动次数一致。

关键词：膜；测量；实验验证；超声脉冲反射法；激光吸收光谱法

中图分类号：TK 31 文献标志码：A 文章编号：0438—1157（2018）07—2972—07

Synchronous thickness measurements of flowing liquid film on horizontal

surface by ultrasonic pulse-echo and laser absorption spectroscopy methods

SU Mingxu, MUHAMMAD Abdul Ahad, JIANG Yong, WU Wei, YANG Huinan

(School of Energy and Power Engineering , University of Shanghai for Science and Technology , Shanghai 200093, China )

Abstract: Because of common existence of liquid film flow in industrial processes, it’s crucial to study methods for measuring thickness of moving liquid film. Measurement accuracy of both ultrasonic pulse-echo and laser absorption spectroscopy methods was validated by calibration standards of known film thicknesses (100－1000 μm). The coefficient of variation was 1.07% for ultrasonic pulse-echo method and 1.29% for laser absorption spectroscopy method. Then, thickness of flowing liquid film was measured by these two methods. The average film thicknesses were in good agreement for two methods when liquid film flow was at low/medium/high velocity. At three corresponding velocities, the difference of average film thicknesses between these two methods were 16.59, 16.26 and 13.36 μm, and the relative standard deviation of film thickness was 0.29%, 7.71% and 25.37%, respectively. Furthermore, both methods detected same number of fluctuations of liquid film within 1 s cycle at three different velocities.

Key words: film; measurement; experiment validation; ultrasonic pulse-echo method; laser absorption spectroscopy method

引

言液膜流动现象广泛地存在于各种工业过程

中[1-5]，例如在降膜蒸发器中料液从降膜蒸发器加热室的上管箱加入，经液体分布集成装置，均匀分配

到各换热管内，在重力和真空诱导及气流作用下， 2017-09-12收到初稿，2018-03-30收到修改稿。联系人：杨荟楠。第一作者：苏明旭（1973--），男，教授。基金项目：国家自然科学基金项目（51676130，51776129，51306123）；博士点基金联合资助课题新教师类项目（20133120120008）。

Received date: 2017-09-12.

Corresponding author: YANG Huinan, yanghuinan@https://www.360docs.net/doc/776032630.html,

Foundation item: supported by the National Natural Science Foundation

of China (51676130, 51776129, 51306123) and the Joint Specialized Research

Foundation for the Doctoral Program of Higher Education (20133120120008). 万方数据