Gas-liquid two-phase flow and its flow measurement

Gas-liquid two-phase flow and its flow measurement The gas-liquid two-phase flow and its flow structure The phenomenon that liquid and its vapor or gases and liquids with different components flow together is called gas-liquid two-phase flow. The former is called single-component gas-liquid two-phase flow, and the latter is called multi-component gas-liquid two-phase flow. Gas-liquid two-phase flow is common in industrial equipment such as power, chemical industry, petroleum, and metallurgy. There is a flow velocity difference between the gas phase and the liquid phase during flow. The gas-liquid two-phase flow varies according to the flow direction, and there are various flow structures. . Figure 3.89 shows the flow structure of gas-liquid two-phase flow in a vertical riser; Figure 3.90 shows the flow structure of gas-liquid two-phase flow in a vertical downtube; Figure 3.91 shows the flow structure of gas-liquid two-phase flow in a horizontal tube Flow structure of phase flow. 1. Flow structure of gas-liquid two-phase flow in a vertical riser. Experimental studies have proved that there are five basic structures: fine bubble flow structure, elastic flow structure, massive flow structure, annular flow structure with fibers and annular flow structure. These five flow structures have the following characteristics respectively. Fine bubble flow structure. Bubbly flow is one of the most common flow structures and is characterized by fine air bubbles dispersed in the liquid phase. Bubbles with a diameter smaller than 1^111 are spherical, and bubbles with a diameter larger than this value have various shapes. 2. Elastic flow structure. The elastic flow structure is composed of a series of air bombs. The end of the air bomb is hemispherical, while the tail is flat. There are small air bubbles between the two air bombs, and the liquid film between the air bomb and the tube wall flows downward. of. blocky flow structure. The block flow structure is formed by the gas bomb rupture, at this time, the gas block flows in a chaotic state in the liquid flow.