Experimental study on gas-liquid flow characteristics of submerged air jets

[摘要] The gas-liquid flow structure and interfacial behavior of submerged air jets were investigated experimentally using high speed digital video camera and image processing techniques. The jet pressure ratio varied from 1.8 to 4.8 in the experiment. And results from different jet nozzles were processed and compared. Statistical characteristics of the jet diameters along the axial distance were obtained and analyzed. Time series analysis was implemented to study the interface unsteadiness by calculating the gas-liquid interface deviation. The results showed that the jet diameters increase first linearly then nonlinearly and its growth rate decreases along the axial distance. The reason for the divergence between the result of this experiment and those done by other researchers was analyzed. Comparing the results of different pressure ratios and nozzle diameters, we found that larger jet pressure ratios have larger jet diameters and nozzle diameters nearly have no bearing on the distribution of dimensionless jet diameters. The interface unsteadiness in low and high pressure ratios exhibited totally distinct properties. And a minimum unsteady value was found along the axis of the air jets.

[发布机构] Institute of Process Equipment, College of Chemical and Biological Engineering, Zhejiang University, Zheda Road 38#, Hangzhou, Zhejiang; 310027, China^1

[效力级别] 工业技术 [学科分类] 工业工程学

[关键词] Different pressures;Gas liquid flows;Gas-liquid interface;High pressure ratio;High-speed digital video cameras;Image processing technique;Interfacial behaviors;Statistical characteristics