Fluidisation and packed bed behaviour in capillary tubes

被引：43

作者：

Doroodchi, Elham ^{[1
]}

Peng, Zhengbiao ^{[1
]}

Sathe, Mayur ^{[1
]}

Abbasi-Shavazi, Ehsan ^{[1
]}

Evans, Geoffrey M. ^{[1
]}

机构：

[1] Univ Newcastle, Sch Engn, Callaghan, NSW 2308, Australia

来源：

POWDER TECHNOLOGY | 2012年 / 223卷

基金：

澳大利亚研究理事会;

关键词：

Micro-fluidised beds; Wall effects; Pressure drop; Capillary tubes; PRESSURE-DROP; WALL; FLOW;

D O I：

10.1016/j.powtec.2011.08.011

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Packed and fluidised beds in microfluidic devices offer the potential of enhanced heat and mass transfer capability at a scale where the process can be closely controlled. The knowledge of hydrodynamics of packed and fluidised beds in capillary tubes is essential for the design and optimization of such devices. This study experimentally examines the hydrodynamics of packed and fluidised beds in terms of pressure drop, bed expansion and minimum fluidisation velocity in tube sizes with inner diameters of 0.8, 1.2 and 17.1 mm. Specifically the influence of the wall on the hydrodynamic characteristics of the beds was examined by changing the tube-to-particle diameter ratio. It was found that as the tube diameter reduces the bed voidage sharply increases leading to a reduction in the pressure drop across the bed. Also a pressure drop overshoot was observed at lower tube-to-particle diameter ratios which found to be associated with contact stresses due to wall friction. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：131 / 136

页数：6