Abstract
An experiment was made to visualize the surface flow pattern of spheres in a packed bed. Spheres, the surface of which were coated with benzoic acid, were set within a packed bed and exposed to water flow for a certain period of time. The flow patterns on the surface were observed by the patterns of dissolution of benzoic acid. The patterns were compared with the results of visualizations by other workers using a different method. It was found that the present results are in good agreement with those results in terms of the location of separation lines and singular points on the surface.
† This report was originally printed in J. Soc. Powder Technology, Japan, 22(9), 599-605 (1985) in Japanese, before being translated into English by KONA Editorial Committee with the permission of the editorial committee of the Soc. Powder Technology, Japan.
