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ion and absorption) or desorption, and forced distribution (Banks, . Thesephenomena are inuenced by many factors, including external environmental factors, 2 White and Jayas properties of the grain through which the gas is moving, and properties of the gases intro- duced into the storage. Interactions that are complex and not yet fully understood occuramong these factors. mathematical model used for predicting the gas ow rates, owing to natural trans- port phenomena, must incorporate the contributions made by each individual transport process involved. Alagusundaram et al. (1a,) developed three-dimensional diffusion model for CO 2in grain bins. This model predicted lower concentrations of CO 2than the concentrations measured in experimental bins. The noninclusion of the movement ofinterstitial air by convection currents within the grain bulk or leaks in the storage structuremight have caused these deviations. The movement of carbon dioxide gas through variety of grain bulks subjected to controlled temperature differences was observed. The CO 2concentration, as it varied with time, was used in nite-difference, diffusionconvection model to determine an averageconvective-pore velocity of CO 2through grain bulks. The average convective-pore veloc- ity increased as the temperature difference increased when the CO 2was introduced into the grain bulk from the bottom surface. The average convective pore-velocity was notaffected by the temperature difference when the CO 2was introduced into the grain bulk from the top surface. The average convective-pore velocity was smaller for canola than for two cereal grains (barley and wheat) or lentils when the CO 2was introduced into the grain bulk from the top and bottom surfaces. The lowest average convective-pore velocitywas 4.3 /H1 /H1m/ for canola at temperature difference of 2 when CO 2was intro- duced into the grain bulk from the bottom surface. The largest average convective-porevelocity was 2.4 /H1 /H1m/ for wheat at