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2 Bulletin of the Polish Academy of Sciences. Technical Sciences

2 2000

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Analogy of Heat and Mass Transfer for Drying Hygroscopic Particles in Vibrated Fluid Beds

Young K., Li Z., Mujumdar A., Kudra T.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2000

Vol. 48, nr 3

463-474

The convective heat and mass transfer coefficients for salt crystals dried in a vibrated fluid bed dryer were determined experimentally at various air velocities, frequecies of grid vibration, and static bed heights. The experimental data were correlated in terms of the Nusselt and Sherwood numbers as functions of the particle Reynolds number, bed geometry and vibration intensity. It is shown that the Colburn analogy for heat and mass transfer does not hold for drying hygroscopic materials in a vibrated fluid bed.

A Two-dimensional Superheated Steam Impinging Stream Dryer: A Computational Model

Mujumdar A., Hosseinalipour S., Devahastin S.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2000

Vol. 48, nr 3

287-299

A computational study was performed to predict the drying performance of a novel two-dimensional impinging stream dryer using superheated steam as the drying medium. The dryer is basically a flash dryer consisting of an opposing jet configuration. Assuming constant rate period drying kinetics, the drying behaviour of superheated steam-particle mixtures flowing in a turbulent two-phase flow is modelled by solving the coupled mass, momentum and energy conservation equations along with a turbulence model for the gas-particle flow. The effects of various operating parameters on the performance of the impinging stream dryer are investigated and discussed. It is evident from the simulation that a considerable amount of moisture can be removed even over a short overall residence time of the particles in the impinging stream system.