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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received June 17, 2021
Accepted December 11, 2021

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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The modelling of fluidized bed dryer for spherical and non spherical particles

Abanti Sahoo Biswajit Swain¹ Soumya Sanjeeb Mohapatra^†

Department of Chemical Engineering, National Institute of Technology, Rourkela, India ¹Department of Metallurgical and Materials Engineering, National Institute of Technology, Rourkela, India

mohapatras@nitrkl.ac.in

Korean Journal of Chemical Engineering, May 2022, 39(5), 1316-1323(8), 10.1007/s11814-021-1043-6

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Abstract

We designed and modelled a fluidized bed dryer. Based on the literature, modelling of a bed dryer is carried out for two situations: for spherical and non-spherical particles. Two case studies were taken from the literature for modelling the fluidized bed dryer for naphthalene balls and mushroom slices. Fluidized bed dryer design was carried out with respect to diffusivity of the bed materials. Drying characteristics in terms of effective diffusivity were studied for naphthalene balls and mushroom slices using a tapered fluidized bed dryer. The variation of effective diffusivity was obtained with change in inlet air temperature, velocity, thickness of slab and drying time. Experimental effective diffusivity as obtained from literature was compared with model predicted values, provided lower deviations with RMSE of less than 8.28% for spherical naphthalene balls and 0.936% for the mushroom slices. Mass transfer coefficient obtained for naphthalene balls was in the range of 2.1×10-4 to 4.857×10-3 m sec-1. The diffusivity constant was evaluated using Fick's diffusion equation assuming surface moisture in equilibrium with the surrounding atmosphere. The value of diffusivity constant (D0) obtained is 1.828×10-9m2sec-1 and the value of activation energy (Ea) obtained is 4.523 kJ mol-1.

Keywords

Activation Energy Fick??s Diffusion Model Fluidized Bed Dryer Variable Effective Diffusivity Naphthalene_x000D_ Balls Mass Transfer Coefficient

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