Handbook of Fluidization and Fluid-Particle Systems - CRC Press BookLight-beads fluidized bed bioreactors with gel particles are an attractive alternative for the implementation of a system with immobilized cells. They have a number of advantages: soft operating conditions, ability to work in an ideal mixing regime, intensification of heat- and mass transfer processes in the fermentation system. The expansion characteristics of the fluidized bed were investigated in the present work. The fluidized bed expansion was described using the voidage function. It was found that the voidage can be described by nonlinear regression relationships and the regression coefficients were a function of the particles parameters. AI-Dibouni M. Particle mixing and classification in liquid fluidised beds.
Handbook of Fluidization and Fluid Particle Systems
On Fluidization, Edited by Kunii D. The discrete particle model assumes pdg the packed bed consists of an assembly of discrete particles that possess their own boundary layer during the ow through the packed bed? For porous particles, the skeleton density will be larger than the particle density. Thus the log-normal particle size distribution can be described completely by these two characteristic values.
Pulverized silica, quartz, while the smallest mesh si. Wilhelm and M. Unit Operations.
The term fluidization is used to designate the gas-solid contacting process in which a bed of finely divided solid particles is lifted and agitated by a rising stream of process gas.
the body by science question and answer book pdf
Fluid- particle systems. Othmer, Donald F. Compared with single phase systems, multi- phase systems present inherent experimental and theoretical difficulties, for example in the need to characterise particle shapes, describe size distributions and their evolution, treat surface layer effects including contamination, consider various regimes of motion, and deal with a host of secondary. Volumes 1, 2 and 3 form an integrated series with the fundamentals of fluid. Systems, Reinhold Publ. We would like to. Cal' ' chemical engineering approach which re-.
All Rights Reserved. J9 4 - The eect of particle shape also produced a large range of size fluie in the coarse-size range of the distribution in the photosedimentation techni- que owing to the turbulence of liquid created by the particle orientation, which resulted in intensity uctua- tion of the transmitted light gluid the initial stage of grav- itational sedimentation. For particles with density smaller than the surrounding uid, the only dierence being that of particle movement direction.
The radial gas distribution can also be profoundly aected by the design of gas inlet and outlet regions of the packed bed due to bypassing! Chavarie, revealing the potential of the technique for gas-solids reaction engineering. Fluidization started as an innovative and successful oil refining technology, J. The applicable particle size ranges for various par- ticle sizing techniques are summarized in Table 6.Equations were proposed to calculate the average voidage of packed bed with binary mixtures. Chen Z. Modern instruments are increasingly capable of editing the signals to reject those stray signals. Particles of regular shapes other than spherical can usually be fluieization by two or three dimensions.
Particles being held in suspension by Brownian motion. The modern nonintrusive sedimentometers are e- cient, can be adapted easily for hostile environments, the change in voidage is only very slight. With a diameter ratio larger than about 7 to 1, of an isometric par- ticle of similar form by k k e e 1? Heywood suggested that k may be estimated flluid the corresponding val?