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The modelling of fluidized bed dryer for spherical and non spherical particles
Abanti Sahoo,Biswajit Swain,Soumya Sanjeeb Mohapatra 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.5
We designed and modelled a fluidized bed dryer. Based on the literature, modelling of a bed dryer is carriedout for two situations: for spherical and non-spherical particles. Two case studies were taken from the literature formodelling the fluidized bed dryer for naphthalene balls and mushroom slices. Fluidized bed dryer design was carriedout with respect to diffusivity of the bed materials. Drying characteristics in terms of effective diffusivity were studiedfor naphthalene balls and mushroom slices using a tapered fluidized bed dryer. The variation of effective diffusivity wasobtained with change in inlet air temperature, velocity, thickness of slab and drying time. Experimental effective diffusivityas obtained from literature was compared with model predicted values, provided lower deviations with RMSE ofless than 8.28% for spherical naphthalene balls and 0.936% for the mushroom slices. Mass transfer coefficient obtainedfor naphthalene balls was in the range of 2.1×104 to 4.857×103 m sec1. The diffusivity constant was evaluated usingFick’s diffusion equation assuming surface moisture in equilibrium with the surrounding atmosphere. The value of diffusivityconstant (D0) obtained is 1.828×109m2sec1 and the value of activation energy (Ea) obtained is 4.523 kJ mol1.