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CONVECTIVE HOT AIR DRYING KINETICS OF RED BEETROOT IN THIN LAYERS

Abhishek Dasore, Tarun Polavarapu, Ramakrishna Konijeti, Naveen Puppala
Frontiers in Heat and Mass Transfer (FHMT) 14 - 23 (2020)


Abstract


The effect of air temperature on drying kinetics of red beetroot slices were investigated experimentally in a cabinet tray dryer. Drying was carried out at 70, 75, 80, and 85 °C with an air velocity 2 m/s and relative humidity 30%. The drying data thus obtained were analyzed to get effective diffusivity values by applying the Fick’s diffusion model. Effective diffusivity increased with increasing temperature. An Arrhenius relation with an activation energy value of 22.62 kJ/mol expressed effect of temperature on the diffusivity. Also, within the given operating range, average heat transfer coefficient at the air-product interface is estimated. Ten mathematical models available in the literature were fitted to the experimental data. The Midilli and Wang & Singh models are given better prediction than the other models and satisfactorily described the drying characteristics of red beetroot slices.


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DOI: http://dx.doi.org/10.5098/hmt.14.23

ISSN: 2151-8629