Study of drag reduction by gas injection for power-law fluid flow in horizontal stratified and slug flow regimes

被引：0
|
作者：
Xu, Jing-yu [1 ]
Wu, Ying-xiang [1 ]
Li, Hua [1 ]
Guo, Jun [1 ]
Chang, Ying [1 ]
机构：
[1] Institute of Mechanics, Chinese Academy of Sciences, No. 15 Beisihuanxi Road, Haidian Dist., Beijing, 100190, China
来源：
Chemical Engineering Journal | 2009年 / 147卷 / 2-3期
关键词：
In this work; the drag reduction by gas injection for power-law fluid flow in stratified and slug flow regimes has been studied. Experiments were conducted to measure the pressure gradient within air/CMC solutions in a horizontal Plexiglas pipe that had a diameter of 50 mm and a length of 30 m. The drag reduction ratio in stratified flow regime was predicted using the two-fluid model. The results showed that the drag reduction should occur over the large range of the liquid holdup when the flow behaviour index remained at the low value. Furthermore; for turbulent gas-laminar liquid stratified flow; the drag reduction by gas injection for Newtonian fluid was more effective than that for shear-shinning fluid; when the dimensionless liquid height remained in the area of high value. The pressure gradient model for a gas/Newtonian liquid slug flow was extended to liquids possessing the Ostwald-de Waele power law model. The proposed model was validated against 340 experimental data point over a wide range of operating conditions; fluid characteristics and pipe diameters. The dimensionless pressure drop predicted was well inside the 20% deviation region for most of the experimental data. These results substantiated the general validity of the model presented for gas/non-Newtonian two-phase slug flows. © 2008 Elsevier B.V. All rights reserved;
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页码：235 / 244
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