Apparatus and method for measuring microtubule gas-liquid diphasic flow rate

Abstract

The invention discloses a device for measuring gas phase and liquid phase flow velocity in miniature tube based on capacitor and cross correlation method and a method thereof. The device comprises an insulating mini-measuring tube, two capacitive sensors, a capacitance-voltage switching circuit, a data acquisition circuit and a computer. The method comprises obtaining two sets of capacitance signals reflecting gas-liquid two phase flow distribution information by the two capacitive sensors, performing capacitance-voltage switching, transmitting to the computer via the data acquisition circuit, calculating the cross correlation function of two sets of capacitance measurement signals with the principle of cross-correlation velocity measurement, determining the transition time of the signals according to the peak position of the cross correlation function, and further obtaining the flow velocity information of the gas phase and liquid phase in the miniature tube. The invention provides an effective way to solve the problem of flow velocity measurement of non-conducting gas phase and liquid phase in the miniature tube, and the device has the advantages of simple structure, low cost with no influence on the flowing of gas phase and liquid phase in the tube by non-invasion manner. The invention is suitable for continuous online flow velocity measurement of non-conducting gas phase and liquid phase in the millimeter-scale miniature tube.

Description

technical field [0001] The invention relates to the field of metering technology, in particular to a microtube gas-liquid two-phase flow velocity measurement device and method based on capacitance and cross-correlation methods. Background technique [0002] Two-phase flow exists widely in petrochemical industry and other fields. As a typical two-phase flow phenomenon, gas-liquid two-phase flow is very common in production practice. In-depth research on gas-liquid two-phase flow often requires measurement of parameters such as flow velocity and void fraction. Continuous on-line monitoring of these parameters is often difficult due to the complexity of two-phase flow systems. [0003] The phenomenon of two-phase flow in micro-systems is a research hotspot nowadays, and has received more and more attention and attention. For example, micro-pipe reactors have been widely researched and applied in many industrial fields. Detection has also become a new direction in the field of...

AI Technical Summary

Problems solved by technology

The combination of capacitance method and cross-correlation velocity measurement principle can realize the non-invasive online measurement of gas-liquid two-phase fluid velocity, which has not been used in the measurement of gas-liquid two-phase flow velocity in micro-pipelines at present.

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