Free-Surface Suspension Flow: Flow-Induced Migration and Surface Morphology

对高固相体积分数(0.3~0.55)的液固流动混合物与相邻不相容流体之间的界面现象进行了实验和计算研究。将研究粒子向界面迁移的影响和界面表面的形状。实验将使用密度和光学指数与载体流体相同的球体的非胶体悬浮液进行。成像和激光多普勒测速(LDV)将提供关于流动微观结构、平均速度以及两相和不混相流体之间的界面的信息。考虑了重力驱动的悬浮流和同心旋转圆柱间的自由面。所提出的研究项目涉及悬浮膜、涂层、挤出、混合和反应过程。

Phenomena occurring at the interface between a flowing liquid-solid particle mixture of high solid volume fraction (0.3 to 0.55) and an adjacent immiscible fluid will be experimentally and computationally investigated. The effects of particle migration towards the interface and the shape of the interfacial surface will be studied. The experiments will be performed with noncolloidal suspensions of spheres of same density and same optic index as the carrier fluid. Imaging and laser-Doppler velocimetry (LDV) will provide information on the flow microstructure, mean velocity and interface between the two-phase and immiscible fluid. Gravity-driven suspension flow and the free surface between concentric rotating cylinders are considered for illustrations. The proposed research project has relevance to suspension films, coatings, extrusion, mixing and reaction processes.