Author/Authors :
Sanaei، Shabnam نويسنده School of Chemical Engineering, College of Engineering, University of Tehran, P.O. Box 11155-4563 Tehran, I.R. IRAN , , Mostoufi، Navid نويسنده , , Radmanesh، Ramin نويسنده Department of Chemical Engineering, , P.O. Box 6075 Station Centre-Ville, Montreal, Quebec, CANADA , , Sotudeh-Gharebagh، Rahmat نويسنده , , Chaouki، Jamal نويسنده ,
Abstract :
Effect of temperature on hydrodynamics of bubbling gas-solid fluidized beds
was investigated. Experiments were carried out in the range of 25-600 ?C and different superficial gas velocities in the range of 0.17-0.78 m/s with sand particles. Time-position trajectory of particles was obtained by radioactive particle tracking technique. These data were used for determination
of mean velocities of upward-moving (including bubble wake and ascending clusters) and
downward-moving (descending clusters) particles. It was found that the upward velocity increases
by increasing temperature up to 300 ?C, however, it decreases by further increase in temperature. Due to the wall effect, there is no significant change in the mean velocity of downward-moving clusters.
The change in hydrodynamic parameters with temperature can be a consequence of changing physical properties of the bed which have been represented by Reynolds number in this study.
