Abstract
The development of controlled atmosphere storage technology for insect control requires an accurate prediction of the distribution of introduced gases in bulk grain. The published models are based on either diffusion theory or convective-diffusion theory. The momentum transport of gases, which is a key driving force for the gas mixture movements, has been neglected. In this paper, all the driving forces for gas transfer were investigated. A momentum-diffusive model is proposed. The model is based on the combined effects of concentration gradients, pressure gradients, and gravity on the transport of gases in the bulk grain. The experimental data for CO2 transfer through connected columns of hot and cold wheat were used to validate the model. The equations were solved using the finite difference method, and the predictions from the proposed model were in good agreement with the experimental results.
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