Govindarao, Venneti MH and Ramrao, Kandiraju VS and Rao, Ammavajjala VS (1992) Structural characteristics of packed beds of low aspect ratio. In: Chemical Engineering Science, 47 (8). pp. 2105-2109.
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Hydrodynamics, and mass and heat transfer in a packed bed depend on the structure of the bed, which is in turn determined by the location of the particles in the bed. The location is prescribed by the confining nature of the wall of the column, particularly in the region close to the wall. For randomly packed beds of aspect ratio (ratio of tube diameter to particle diameter) greater than two, determining the exact locations is not possible, although the first two layers of the particles from the wall are well-ordered, because the mechanism of random packing of even the simplest form of particles, namely spheres, is not yet understood. Investigations should therefore aim to analyze relatively simple systems; beds of equal-sized spheres of aspect ratio between one and two constitute such systems. These beds have been the subject of considerable research work, [e.g. Scott et al. (1974), Hsiang and Haynes (1977), Dixon and Creswell (1979). Dixon et al. (1984). Melanson and Dixon (1985), Ahn et al. (1986). Cui et al. (19901, Johnson and Kapner (1990) and Tsotsas and Schliinder (1990)]. An analysis of the structure of the bed has hardly ever been reported.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to Elsevier Science Ltd.|
|Department/Centre:||Division of Mechanical Sciences > Chemical Engineering|
|Date Deposited:||01 Apr 2008|
|Last Modified:||19 Sep 2010 04:44|
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