Vortex shape and gas-liquid hydrodynamics in unbaffled stirred tank

被引：10

作者：

Prakash, Baranivignesh ^{[1
]}

Bhatelia, Tejas ^{[1
]}

Wadnerkar, Divyamaan ^{[2
]}

Shah, Milinkumar T. ^{[1
]}

Pareek, Vishnu K. ^{[1
]}

Utikar, Ranjeet P. ^{[1
]}

机构：

[1] Curtin Univ, Western Australia Sch Mines Minerals Energy & Che, Perth, WA 6845, Australia

[2] Reliance Ind Ltd, Maker Chambers 4, Mumbai 400021, Maharashtra, India

来源：

CANADIAN JOURNAL OF CHEMICAL ENGINEERING | 2019年 / 97卷 / 06期

关键词：

unbaffled stirred tank; vortex shape; optical probe; CFD; BUBBLE-SIZE; FLOW; SURFACE; HOLDUP; VESSEL; COLUMN;

D O I：

10.1002/cjce.23433

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The present study investigated the effect of impeller speed and vortex ingestion on vortex shape, gas holdup, and bubble size distribution in an unbaffled stirred tank using optical probe measurements. Further, the ability of the volume of the fluid model to predict vortex shape was examined. Without vortex ingestion, an increase in impeller speed resulted in a significant variation in vortex shape, whereas it had a negligible effect on vortex shape with ingestion. This suggests that when vortex ingestion occurred, most of the energy was consumed for the dispersion of gas rather than the deformation of the gas-liquid interface. It was observed that a large number of gas bubbles were entrained into the vortex core around the impeller region, which led to a lower gas holdup at the top axial locations. An increase in the impeller speed also resulted in the formation of larger bubbles. The absence of baffles limits shear for bubble break up, resulting in larger bubbles above the impeller plane.

引用

页码：1913 / 1920

页数：8

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