IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 35th IAHR Congress - Chengdu (2013) : THEME 4 - HYDRO-ENVIRONMENT : CFD and PBM Coupled Model of Bubble Jet in Stagnant Water
CFD and PBM Coupled Model of Bubble Jet in Stagnant Water
Author : Zegao Yin and Qiang Zhao
Bubble jet is a usual method for improving the artificial aeration, circulation and mixing in liquids. In this paper, a 3-D mathematical model was established to simulate the air-water bubble jets in a stagnant water tank. The Renormalization Group (RNG) k-e model was used to express the turbulence characteristics between bubbles and water. The population balance model (PBM) was used to describe the coalescence and breakup action between bubbles. Then, the mathematical model was validated with the experimental data of Lima Neto et al. (2008b), and they agree with each other approximately. Furthermore, the mathematical model previous mentioned was used to compute the gas volume fraction and bubble diameter under different conditions. The results show that gas volume fraction and the bubble diameter decrease with the increasing axis distance from the nozzle center. Given the same volumetric flow rate of air at the nozzle, they don?t vary much with the variation of water flow rate. Given the same volumetric flow rate of water at the nozzle, they increase respectively with the increasing volumetric flow rate of air. Volumetric flow rate of air plays a significant role in gas volume fraction and bubble diameter distribution.
File Size : 151,687 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 35th IAHR Congress - Chengdu (2013)
Date Published : 18/07/2016
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