โ Scribed by J.F. Davidson; D. Harrison
No coin nor oath required. For personal study only.
This paper considers two aspects of the behaviour of a bubbling fluidised bed, namely (a) How is the rising velocity of a bubble in a cloud of bubbles related to the velocity of the same bubble in complete isolation? This is important in the consideration of the expansion of a bed of particles dud to bubbles rising through it.
(b) How is the total flow of fluidising fluid to the bed divided between the bubble and particulate phases? New theory is given which partly justifies the assumption that the total flow is equal to the flow due to the rising bubbles plus the flow required for incipient fluidisation.
๐ SIMILAR VOLUMES
## Abstract Low density polyethylene and polypropylene are produced at large scale via the Unipol process. In this process catalyst particles are fluidised with monomer gas and grow into polymeric particles up to a size of 1โmm. The process is operated at 20โ25 bar. Pressure plays an important role
## Shorter Communications characteristic time of the fluid Greek symbols natural time of the fluid radial, angular and axial component of the % velocity, respectively second invariant of the rate of deformation tensor
Based on the observed pattern of coalescence of bubble pairs in vertical alignment in a two-dimensional bed, a theory is developed which describes how bubble size and frequency changes with height in a gas fluidised bed. It is confirmed by comparison with the reported data from 10 separate investiga