Drop Penetration into Porous Powder Beds

多孔性 渗透(战争) 下降(电信) 材料科学 压力降 体积分数 复合材料 化学工程 机械 计算机科学 运筹学 电信 物理 工程类
作者
Karen Hapgood,James D. Litster,Simon Biggs,Tony Howes
出处
期刊:Journal of Colloid and Interface Science [Elsevier]
卷期号:253 (2): 353-366 被引量:233
标识
DOI:10.1006/jcis.2002.8527
摘要

The kinetics of drop penetration were studied by filming single drops of several different fluids (water, PEG200, PEG600, and HPC solutions) as they penetrated into loosely packed beds of glass ballotini, lactose, zinc oxide, and titanium dioxide powders. Measured times ranged from 0.45 to 126 s and depended on the powder particle size, viscosity, surface tensions, and contact angle. The experimental drop penetration times were compared to existing theoretical predictions by M. Denesuk et al. (J. Colloid Interface Sci.158, 114, 1993) and S. Middleman (“Modeling Axisymmetric Flows: Dynamics of Films, Jets, and Drops,” Academic Press, San Diego, 1995) but did not agree. Loosely packed powder beds tend to have a heterogeneous bed structure containing large macrovoids which do not participate in liquid flow but are included implicitly in the existing approach to estimating powder pore size. A new two-phase model was proposed where the total volume of the macrovoids was assumed to be the difference between the bed porosity and the tap porosity. A new parameter, the effective porosity εeff, was defined as the tap porosity multiplied by the fraction of pores that terminate at a macrovoid and are effectively blocked pores. The improved drop penetration model was much more successful at estimating the drop penetration time on all powders and the predicted times were generally within an order of magnitude of the experimental results.
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