Journal of Fluid Mechanics

One- and two-dimensional travelling wave solutions in gas-fluidized beds

B. J.  Glasser a1, I. G.  Kevrekidis a1 and S.  Sundaresan a1
a1 Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544, USA

Article author query
glasser bj   [Google Scholar] 
kevrekidis ig   [Google Scholar] 
sundaresan s   [Google Scholar] 


Making use of numerical continuation techniques as well as bifurcation theory, both one- and two-dimensional travelling wave solutions of the ensemble-averaged equations of motion for gas and particles in fluidized beds have been computed. One-dimensional travelling wave solutions having only vertical structure emerge through a Hopf bifurcation of the uniform state and two-dimensional travelling wave solutions are born out of these one-dimensional waves. Fully developed two-dimensional solutions of high amplitude are reminiscent of bubbles. It is found that the qualitative features of the bifurcation diagram are not affected by changes in model parameters or the closures. An examination of the stability of one-dimensional travelling wave solutions to two-dimensional perturbations suggests that two-dimensional solutions emerge through a mechanism which is similar to the overturning instability analysed by Batchelor & Nitsche (1991).

(Published Online April 26 2006)
(Received February 23 1995)
(Revised July 10 1995)