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Title Effect of Temperature on Drying Kinetics of Vegetable Seeds
Author Name Thingujam Bidyalakshmi Devi
Abstract

A study was conducted to investigate the effect of temperature on drying kinetics of onion, carrot and tomato seed. The seeds were dried at drying temperatures of 30oC, 35oC and 40oC in a laboratory hot-air oven dryer. Drying rate was faster at higher temperature (40oC) than at lower temperatures. Drying of the seeds occurred in falling rate periods of drying. Drying data were fitted into Newton, Page, Modified Page, Henderson-Pabis, Logarithmic, two-term exponential, and Wang and Singh models. Based on highest R2 and lowest ?2, RMSE and mean error values, Page model (R2>0.9) was found to be the best fit for drying of all selected seeds at the selected temperatures. However, two-term exponential model was the best fit for onion seed at 35oC and carrot seed at 30oC, and was comparable with Page model in the selected temperature range. Effective moisture diffusivity of onion, carrot and tomato seed ranged between 1.59 x 10-10 m2.s-1 and 3.18 x 10-10 m2.s-1, 3.55 x 10-10 m2.s-1 and 7.10 x 10-11 m2.s-1, 2.65 x 10-10 m2.s-1 and 5.31 x 10-11 m2.s-1, respectively, at above drying temperatures. Activation energies of onion, carrot, and tomato seed were 56.85 kJ.mol-1, 60.69 kJ.mol-1, and 61.44 kJ.mol-1, respectively.

Keyword temperature. drying kinetics , vegetable seeds ,
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