Optical measurement of mass transfer between gas and liquid phases in hydraulic circuits

Hao TIAN

doi:10.3788/OPE.20182612.2902

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Optical measurement of mass transfer between gas and liquid phases in hydraulic circuits

Modern Applied Optics | 更新时间：2020-07-05

- Optical measurement of mass transfer between gas and liquid phases in hydraulic circuits
- Optics and Precision Engineering Vol. 26, Issue 12, Pages: 2902-2908(2018)
- 作者机构：
  
  大连海事大学船舶与海洋工程学院，辽宁大连 116026
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20182612.2902
  CLC： TH741
- Received：15 May 2018，
  
  Accepted：29 May 2018，
  
  Published：25 December 2018
- 稿件说明：
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Hao TIAN. Optical measurement of mass transfer between gas and liquid phases in hydraulic circuits[J]. Optics and precision engineering, 2018, 26(12): 2902-2908.
DOI：

Hao TIAN. Optical measurement of mass transfer between gas and liquid phases in hydraulic circuits[J]. Optics and precision engineering, 2018, 26(12): 2902-2908. DOI： 10.3788/OPE.20182612.2902.

摘要

为研究液压系统工作压力下管路中自由气体的气液传质过程，解决油液中气泡质量变化的光学测量问题，推导了高压油液环境下气泡直径测量的恒温及零温度梯度条件，设计了高压气液传质光学测量系统，并对该系统的气泡识别与跟踪的关键算法进行研究。根据毕渥数及牛顿冷却定律推导了测量气泡的极限尺寸，提出以气泡圆度为判定阈值的气泡图元识别算法。最后，利用相邻帧间气泡中心最小向量的方法实现对气泡圆心的跟踪。实验结果表明：该系统实现了14 MPa下气液传质的光学测量，气泡半径测量误差小于4%，提供了高压油气传质的试验手段，基本满足液压油路气液两相传质的光学测量要求。

Abstract

In order to study the mass transfer between the free gas and oil in a fluid power system and realize bubble mass measurement in oil

the radius limit of the bubble during measurement was derived from steady state and zero temperature gradient conditions. A high-pressure gas-oil mass transfer optical measurement system was designed

and the key algorithms for bubble identification and tracking were studied. First

the radius limit of a bubble during measurement was derived from the Biot number and Newton's Law of Cooling

and a high-pressure gas-oil mass transfer optical measurement system was designed. Then

a method to identify bubble elements from a video was demonstrated

based on the roundness of a circle and a set threshold. Finally

a minimum vector length method was used to track the center of a bubble between frames. Experimental results indicate that the system can achieve optical measurements under a pressure of 14 MPa

and the error for measuring the radius of the bubble is within 4%. The experimental method for gas-oil mass transport study can satisfy the system requirements of optical measurement of gas-oil mass transfer in a fluid power system.

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