Device and method for measuring dryness of gas-liquid two-phase fluid

Abstract

The invention discloses a device and a method for measuring dryness of gas-liquid two-phase fluid. The device comprises a cyclone, a measuring tube, a tracing bubble unit, an image acquisition unit, a differential pressure transmitter and an industrial personal computer, wherein the cyclone is mounted in the measuring tube and used for enabling the gas-liquid two-phase fluid to generate separating force between gas and liquid, the liquid phase flows along the inner wall of the measuring tube to form a liquid film, and the gas phase flows in the center of the measuring tube to form a gas core; the tracing bubble unit is used for planting a plurality of tracing bubbles into the liquid film; the differential pressure transmitter is used for measuring the pressure difference between the two ends of the cyclone; the image acquisition unit is used for acquiring images of a liquid film and a gas core in the measuring tube and an image of a motion trail of tracing bubbles, and the industrial personal computer is used for analyzing the images to obtain the flow velocity and the flow area of the liquid film and the flow of the liquid film, calculating the gas phase flow according to the flow of the liquid film and a pressure difference value, and finally determining a dryness value. The measurement process has the characteristics of visualization and good real-time performance.

Description

technical field [0001] The invention belongs to the technical field of thermal control, and in particular relates to a gas-liquid two-phase fluid dryness measurement device and method. Background technique [0002] In 1965, Gordon Moore proposed the famous "Moore's Law", that is, the number of transistors that can be accommodated on an integrated circuit will double every 18 months. The subsequent rapid development of large-scale integrated circuits confirmed this law. With the continuous improvement of circuit integration, the cooling problem of electronic chips is becoming more and more prominent. Since entering the 21st century, the heat flux density of integrated circuit chips has risen to 100-1000W / cm2. The effective heat dissipation method of electronic chips has become one of the core issues restricting the large-scale use of high-power devices, and plays a key role in energy power, machinery manufacturing, material chemical industry, electrical telecommunications, ...

AI Technical Summary

Problems solved by technology

The disadvantage of this invention is that it only uses the tiny bubbles naturally formed in the phase separation process of the two-phase flow as tracer particles to complete the measurement, and lacks a means that can effectively control and adjust the size and quantity of the bubbles, especially For the gas-liquid two-phase flow formed by a single-component fluid, the gas phase and the liquid phase are in a saturated state, and the two phases are prone to phase transitions. The size of the bubble has a great influence on the phase transition and phase balance. The smaller the radius, the bubble more likely to condense and disappear into the liquid phase

Therefore, the tiny bubbles formed by gas-liquid mixing are difficult to survive in the saturated liquid phase, and cannot form reliable tracer bubbles in the liquid film, which affects normal measurement

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