Experimental And Numerical Analysis Of Void Structure In Random Packed Beds Of Spheres
POWDER TECHNOLOGY(2021)
摘要
The prediction of the pressure drop of packed beds requires an accurate estimation of the packed-bed porosity as its error propagation multiplies the occurring errors by a factor of about four. For a better understanding of the packed bed's local porosity characteristics, a comprehensive x-ray tomography study was performed investigating and correlating the void structure of packed beds made of smooth, mono-sized spheres in cylindrical confining walls having tube-to-particle diameter ratios lambda = 3.0 to 9.0 reinforced by numerically generated packed beds of lambda = 1.1 to 9.0. An in-depth analysis of the obtained oscillating void profiles is performed, discussing the locations and heights of porosity extrema. Most importantly, a significant and in parts surprising extrema formation in the tube's center is described, especially present for lambda < 6, which is assumed to have a predominant effect on the packed bed's pressure drop. (C) 2020 Elsevier B.V. All rights reserved.
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关键词
Packed-beds, Numerical modeling validation, X-ray tomography, Radial porosity profiles, Contact number
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