Method for measuring bubble size, bubble number and bubble movement velocity in gas-liquid two-phase flow

Abstract

The invention relates to a method for measuring the bubble size, the bubble number and the bubble movement velocity in a gas-liquid two-phase flow. During the ultrasonic propagation process in the fluid, no significant energy attenuation occurs during the propagation process. During the ultrasonic propagation process in the gas-liquid two-phase flow, the acoustic impedance of the gas is much smaller than that of the liquid, so that the energy loss is caused. Through detecting the attenuation degree and the attenuation time of ultrasonic waves, the particle size of gas bubbles and the movement velocity of gas bubbles can be determined. In this way, the number of gas bubbles in a measurement region within a certain period of time can be obtained. The measurement system is simple in structure and low in equipment cost, which can realize the on-line measurement. The method is applied to the scientific research in a laboratory, and is particularly applicable to applications at an industrial site. Compared with gas bubble measurement methods based on other principles, such as the capacitance method, the photoelectric method and the like, ultrasonic waves are stable in performance, free from being interfered by the circuit, strong in penetrating power and capable of being propagated in optically opaque media. The above method is fast in measurement speed, easy to measure and good in data automation, thus having significant advantages.

Description

technical field [0001] The invention relates to an ultrasonic detection technology, in particular to a method for measuring the size, number and moving speed of bubbles in a gas-liquid two-phase flow. Background technique [0002] Bubbles have a variety of formation mechanisms, and widely exist in various fields such as nature, medical treatment, and chemical industry. They generally exist in the form of gas-liquid two-phase flow, where the gas is the dispersed phase and the liquid is the dispersed medium. The existence of bubbles often has a great impact on medical, chemical and other fields. For example, in the process of infusion, if there are air bubbles in the infusion tube, the air bubbles will have adverse effects on the patient when they enter the patient's body, and even cause the death of the patient when the volume of the air bubbles is greater than 5mL. Therefore, it is necessary to detect bubbles in gas-liquid two-phase flow. [0003] Ultrasonic testing techno...

AI Technical Summary

Problems solved by technology

In addition, the ultrasonic bubble detection device only needs to install a pair of ultrasonic transducer probes on the pipe and container wall to be tested. It is easy to install and has no special requirements on whether the pipe and container wall are transparent or not. It is convenient for industrial On-line detection and application, while image method and light scattering method have strict requirements on light source, camera, medium to be measured and experimental installation conditions, so it is not convenient to realize the needs of online measurement and industrial field application

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