Abstract
This investigation was carried out to find out the properties of adsorption phenomena of barley, which occurs locationaly at the beginning of deep bed drying and air circulation in the storage bin.
Authors studied experimentally static adsorption phenomena of barley and the following conclusions were obtained;
1) The method of using a saturated aqueous solution of salt was not so suitable to static adsorption experiment as that of using a aqueous solution of H2SO4 because of poor control of humidity.
2) An adsorption process after the time quite passed was described as the exponential equation.
3) The influential factors on the process were both, intra-particle and fluid-side mass transfer over the range of this investigation and the measured values of this investigation couldn't be compared simply with experimental data of drying because of differences in the factors.
4) The relationship between adsorption constant defined as Kad and temperature was described as Arrehnius equation in the range of 40 to 70%rh.. It was also found that the adsorption constant depended on the humidity.
5) The modified experimental equation of equilibrium moisture curve was developed and the predicted value by the equation was in good agreement with the measured value over the wide range of relative humidity. The modified equation was described as;
In Me=a0+a1x+a2x2
Where, x=In(-In (1-φ))
6) The heat of adsorption was described as the following equation derived by Othmer method.
