Horizontal laminar flow of coarse nearly-neutrally buoyant particles in non-Newtonian conveying fluids: CFD and PEPT experiments compared
Horizontal laminar flow of coarse nearly-neutrally buoyant particles in non-Newtonian conveying fluids: CFD and PEPT experiments compared
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DOI：
10.1016/j.ijmultiphaseflow.2008.06.003
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发表时间：
2008-11-01
影响因子：
3.8
通讯作者：
Barigou, M.
中科院分区：
文献类型：
--
作者：
Eesa, M.;Barigou, M.
采用欧拉-欧拉CFD模型对粗颗粒悬浮液在非牛顿载体流体中的水平流动进行了数值模拟。本文研究了管内浓度高达41%v/v的Ellis流变学流体在层流中输送的直径为5 mm和10 mm的近中性浮力颗粒，并将CFD预测的固相速度分布和通过时间与正电子发射颗粒跟踪(PEPT)技术和霍尔效应传感器获得的实验数据进行了比较，考虑到所研究的流动的复杂性，得到了非常好的一致性。CFD对固-液压降的预测与从文献中收集的一些相关关联式进行了比较。其中只有一人在所研究的所有条件下都表现出了良好的一致性。其他关联式普遍显示出与CFD的较大偏差，它们在预测固体浓度和颗粒大小的影响方面存在局限性。总体而言，对于所研究的流动，CFD能够给出比文献中的关联式更好、更可靠的压降预测。(C)2008爱思唯尔有限公司。保留所有权利。
The horizontal flow of coarse particle suspensions in non-Newtonian carrier fluids was numerically simulated using an Eulerian-Eulerian CFD model. This study was concerned with nearly-neutrally buoyant particles of 5 and 10 mm diameter conveyed by fluids of Ellis rheology in laminar flow, in a 45 mm diameter pipe at concentrations up to 41% v/v. CFD predictions of solid phase velocity profiles and passage times were compared to experimental data obtained by a Positron Emission Particle Tracking (PEPT) technique and Hall effect sensors, and a very good agreement was obtained considering the complexity of the flows studied. CFD predictions of solid-liquid pressure drop were compared to a number of relevant correlations gleaned from the literature. Only one of them showed a good agreement over the whole range of conditions studied. Other correlations generally showed large deviations from CFD, and their limitations in predicting the influence of solids concentration and particle size have been demonstrated. Overall, it emerged that for the flows studied, CFD was capable of giving predictions of pressure drop which were probably better and more reliable than the correlations available in the literature. (C) 2008 Elsevier Ltd. All rights reserved.