The effect of inlet conditions on concentrated suspension flows in abrupt expansions
The effect of inlet conditions on concentrated suspension flows in abrupt expansions
复制标题
入口条件对突然膨胀时浓悬浮液流动的影响
DOI：
10.1063/1.2409619
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发表时间：
2006
影响因子：
4.6
通讯作者：
N. Shapley
中科院分区：
文献类型：
--
作者：
T. Moraczewski;N. Shapley
这项工作探讨了入口条件对浓悬浮液的颗粒浓度分布和流场的影响，该悬浮液在突然的轴对称 1:4 膨胀中经历稳定流动。具体来说，我们考虑上游窄管入口条件对下游剖面的影响。使用核磁共振成像测量颗粒浓度和速度分布。使用两种不同的入口管长度（10d1 和 128d1）进行实验，其中 d1 是窄入口管的直径。在短入口情况下，没有一个颗粒浓度场在进入膨胀时完全形成，而一些悬浮液在长入口情况下具有完全形成的轮廓。结果表明，入口管长的情况下，核心区域和环形区域之间的浓度差异大于入口管短的情况，这可能是由于在......
This work explores the influence of inlet conditions on the particle concentration distribution and flow field of a concentrated suspension undergoing steady flow in an abrupt, axisymmetric 1:4 expansion. Specifically, we consider the impact of inlet conditions in the upstream narrow tube on the resulting downstream profiles. Particle concentration and velocity profiles were measured by using nuclear magnetic resonance imaging. Experiments were conducted with two contrasting inlet tube lengths of 10d1 and 128d1, where d1 is the diameter of the narrow inlet tube. In the short inlet case, none of the particle concentration fields were fully developed upon entering the expansion, whereas several of the suspensions had fully developed profiles in the long inlet case. Results indicate that concentration differences between the core and annular regions were greater for the cases with a long inlet tube than in cases with a short inlet tube, likely owing to the higher degree of particle migration occurring in the...