The study some physical properties of desicant for paddy drying using adsorption technique.(Thai)

Abstract

The objectives of this research were to determine some physical properties of agriculture residues such as bulk density, voids fraction, specific heat capacity, equilibrium moisture content (EMC) and moisture diffusion coefficient. The results show that the bulk density, voids fraction and specific heat capacity varied as a linear function of moisture content. To determine the adsorption EMC of absorbents, it was shown that the EMC increases with increased relative humidity under conditions in the range of 30-50o C and 10-90% relative humidity. The Henderson model (1952) is the best fit to the experimental data. The diffusion coefficient of adsorbents shows that the increased moisture diffusion coefficient varies exponentially with drying temperature in the range of 31-90o C and 1.5 m/s air velocity.