Evaluation of particle migration models based on laser Doppler velocimetry measurements in concentrated suspensions
Evaluation of particle migration models based on laser Doppler velocimetry measurements in concentrated suspensions
复制标题
DOI：
10.1122/1.1647560
复制
发表时间：
2004-03-01
影响因子：
3.3
通讯作者：
Armstrong, RC
中科院分区：
文献类型：
--
作者：
Shapley, NC;Brown, RA;Armstrong, RC
这项研究比较了几种粒子迁移的“悬浮温度”模型与激光多普勒测速测量在非胶体球体的浓缩悬浮中的预测。我们比较了窄间隙Couette流中的剪切速率、浓度和悬浮温度分布。在中等浓度下，模型能很好地预测观测到的宏观剪切速率和浓度分布，但在浓度较高时，模型之间以及与数据之间存在偏差。此外，模型的预测值与悬浮液温度测量结果相比也较差。大多数模型大大低估了标量温度的大小，只捕捉到温度张量中较小的两个对角分量的大小。此外，该模型不能预测悬浮液温度随颗粒浓度的变化。我们的研究表明，忽略悬浮温度各向异性和模型系数的定性选择都会导致模型预测与数据之间的偏差，其中忽略各向异性更为重要。(C)2004年流变学学会。
This study compares the predictions of several "suspension temperature" models of particle migration to laser Doppler velocimetry measurements in a concentrated suspension of noncolloidal spheres. We compare the shear rate, concentration, and suspension temperature profiles in narrow-gap Couette flow. The models predict the observed macroscopic shear rate and concentration profiles well at moderate bulk particle concentration but diverge from one another and from the data at high concentrations. In addition, the predictions of the models compare poorly with suspension temperature measurements. Most of the models greatly underpredict the magnitude of the scalar temperature, capturing instead only the magnitude of the smaller two diagonal components of the temperature tensor. Also, the models do not predict the observed variation of the suspension temperature with particle concentration. Our investigation shows that both neglect of suspension temperature anisotropy and qualitative choices of model coefficients contribute to discrepancies between the model predictions and data, of which the neglect of anisotropy is more important. (C) 2004 The Society of Rheology.