化工学报 ›› 2018, Vol. 69 ›› Issue (7): 2972-2978.DOI: 10.11949/j.issn.0438-1157.20171251

• 流体力学与传递现象 • 上一篇    下一篇

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

苏明旭, Muhammad Abdul Ahad, 蒋永, 吴威, 杨荟楠   

  1. 上海理工大学能源与动力工程学院, 上海 200093
  • 收稿日期:2017-09-12 修回日期:2018-03-30 出版日期:2018-07-05 发布日期:2018-07-05
  • 通讯作者: 杨荟楠
  • 基金资助:

    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)。

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   

  1. School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
  • Received:2017-09-12 Revised:2018-03-30 Online:2018-07-05 Published:2018-07-05
  • Supported by:

    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).

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

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

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