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Performance of liquidsolid twophase flow in jet pump by LES |
ZHOU Ling-Jiu, YUAN Ling-Li |
(College of Water Conservancy and Civil Engineering, China Agriculture University, Beijing 100083, China) |
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Abstract To find out the flow characteristic of 3D liquidsolid twophase flow in a jet pump, the large eddy simulation (LES) was used to calculate the flow field in the jet pump. The mixture model was adopted to treat the liquidsolid twophase interaction. Influences of solidphase initial volume fraction and granular diameter as well as flow ratio on the jet pump characteristics were analyzed. The results show that the pressure ratio and efficiency of pumping solidliquid two phase fluids have a minor difference with those of delivering water at a small flow rate ratio. With increasing flow rate ratio, however, the pressure ratio and efficiency for solidliquid two phase fluids are decreased a lot compared with those for water when the granule density is increased. For a constant initial solid volume fraction and granular diameter, the solid volume fraction is increased with the flow ratio after a fully mixing takes place. The larger the granular diameter, the more easily the solid volume fraction distribution becomes concentrated. The results of the study lay a foundation for particular applications of engineering.
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Received: 13 November 2011
Published: 30 September 2012
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