تعيين مقادير رطوبت تعادلي و ضريب نفوذ مولكولي رطوبت در دانه هاي متخلخل نيترات آمونيم

Determination of equilibrium data of the moisture content and diffusivity of moisture in porous ammonium nitrate particles

Equilibrium data of the moisture content of ammonium nit rate when exposed to air flows with 20 to 65% moisture were obtained and the absorption and desorption isotherms were plotted at 29, 38 and 44°C using EMC. The evaporation (absorption) rate of moisture was determined and its relation with the moisture content was investigated at constant temperatures. Granular ammonium nitrate (explosive grade) from Shiraz petrochemical company was used. The molecular diffusion coefficient of moisture in ammonium nitrate was calculated at the temperatures mentioned above an d its relation with temperature was determined.