Numerical simulation of solid liquid two phase flow mechanism in disc pump with radial straight blade

Key words:  computational fluid dynamics  disc pump with radial straight blade  bladeless zone of impeller  blade zone of impeller  solid liquid two phase turbulent flow  flow mechanism  numerical simulation

Abstract:

To study the solid liquid two phase flow mechanism in disc pump, impeller was divided into bladeless zone and blade zone. The multiple reference frames (MRFs) approach was used to simulate impeller rotation in pump casing.Three dimensional simulation was performed for the solid liquid two phase turbulent flow in disc pump by using Fluent software with Eulerian model, extended SIMPLEC algorithm and RNG(renormalization group) k ε turbulence model.On the basis of experimental verification of hydraulic performance,the internal velocity and pressure distribution and volume fraction distribution for solid phasin in bladeless zone of the disc impeller was achieved.The results show that rotational flow is main flow in bladeless zone of impeller, pressure is low in most bladeless zone of impeller, high energy fluid in blade zone of impeller flow into bladeless zone of impeller and transfers angular momentum to fluid in bladeless zone of impeller. Solid particles mainly accumulate in bladeless zone of impeller,and in blade zone of impeller,maximal volume fraction of solid particles is on pressure surface of blade near the exit of impeller close to bladeless zone of impeller.Good ability to throughflow and smaller impeller wear in disc pump are attributed to most solid particles discharges from bladeless zone of impeller not from blade zone of impeller.