Numerical simulation on field characteristics of multiphase flow in side-entering stirred tank
- Received Date: 30/03/2012
- Accepted Date: 22/02/2012
- Available Online: 09/04/2013
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Key words:
- side-entering stirred tank /
- numerical simulation /
- multiphase flow field /
- solid-liquid suspension
Abstract: Single phase and multiphase flow fields in side-entering agitation reactor with different installation angles of agitators were simulated numerically by CFD technology. The results showed that, with the typical installation angle of agitator, the flow field was a big circular flow combined with two parts, which were the internal upwelling flow with high speed and the external downwelling flow. The horizontal dip angle of agitator increased the average speed of the whole flow field, which favored the suspension situation of solid particles. It also enlarged the area of the high speed flow at the tank bottom, which improved the aggradation situation of solid phase. Meanwhile the vertical dip angle enlarged the area of the high speed flow at the tank bottom too, and flushed the tank bottom, therefore further reduced the possibility of aggradation. While there was no dip angle, the area of highest solid ratio mainly laid under the agitators. When the horizontal dip angle was 10°and vertical dip angle was 5°,the solid ratio of most areas at the tank bottom was homogeneous distribution, except some areas at the right side of the agitators near the tank wall, where the solid ratio was higher. And with this installation angle, the quality of solid-liquid suspension and the ability to avoid the aggradation of solid at the bottom could be the best.