Search

Airlift pump has a several flow pattern in lifting mixtures liquids and solid through a vertical pipe. The flow pattern in airlift pump have been investigated in previous studies, the study focus on two-phase flow and performance of air lift pump. For this reason, the purpose of experiment was to known the flow pattern of gas-solid-liquid three-phase flow in airlift pump during the solid particles lifting in the upriser. In the present experimental study, we have modified the conventional airlift pump system by used swirl injector in the system. Here, experimental study on the flow pattern of gas- solid-liquid three-phase flow in upriser airlift pump to lift the solid particles with the vertical pipe as the transporting medium was conducted. The upriser pipe was an acrylic pipe with an inner diameter at 56 mm, and the total height of 340 cm. The type of gas injector in the system was swirl with 2 injectors in suction head of air lift pump. The solid particle of the present experiment was sand with particle diameters 0.774 mm and 1.43 mm, and the supplied air flow rate ranged from (60-80 LPM). The solid lifting particles were capture by using a high speed camera of the frame speed of 3000 fps. As a result, it was obtained that (1) the optimum of solid lifting particle was found in the slug flow pattern, (2) the particle diameters and volumetric flow rate of the lifted particles affect the ability of the air lift pump. [ABSTRACT FROM AUTHOR]

Airlift pump can be used as an alternative to lift the sediment from the the water. The airlift pump employed in this study was a conventional type that used a compressor on the injector system. This study aimed to determine the characteristics of the airlift pump in a three-phase flow. In the experiments, the sludge used was solid spherical particles with 1.43 mm as the particle average diameters. The experiment operated upriser pipe with an inner diameter 56 mm and 3.4 m height. The submergence ratio of the upriser in water was: 0.5, 0.62, and 0.74, while the supplied air flow rate was 60 l/min, 70 l/min, and 80 l/min under atmospheric conditions. The research matrix was obtained by combined two variables, which were the submergence ratio and the airflow rate. Further, it was used to determine the effect on the flow rate of discharge solid particles, the flow rate of discharge water, and the pressure gradient. Visual observation was utilized to determine the behavior of the three-phase liquid-gas-solid flow in the pipe. The results were acquired from visual observations that depicted the flow regime occurrence, slug, churn, and annular. Moreover, the measurement results of the flow rate and pressure gradient discovered that in the submergence ratio and the injected air flow rate had a significant influence on the flow characteristics. [ABSTRACT FROM AUTHOR]

Microbubble generator is a device that produces micro-sized bubbles that are useful to increase the dissolved oxygen in the water. This present work investigates the effect of the swirl flow created by the cyclone of a 12 mm orifice type microbubble generator using a 300 mm stainless steel wire mesh porous tube. To review the performance of the microbubble generator, three parameters were considered. Those are the hydraulic power (Lw), pressure drop, and bubble diameter distribution. The hydraulic power and pressure drop values were acquired by using the pressure sensor of Validyne P55D, while the bubble diameter distribution was obtained using a high-speed camera. The results indicate that the bubble diameters appear with the highest probability in the diameter range of 300 - 450 µm. The increase of water and airflow rates cause the rise of the hydraulic power and pressure drop. [ABSTRACT FROM AUTHOR]