Study on rough rice fissuring during intermittent drying

The fissuring of rough rice during intermittent drying was studied through experimental and numerical methods. The moisture distribution inside the ri ce kernel during drying and tempering was obtained by diffusion model. The moisture gradients were used to analyze the hydro stresses in the rice kern el during intermittent drying. Discontinuing the drying process with tempering can decrease the hydro stre sses in the rice kernel. Decreased unit drying time or increased intermitte nt ratio caused decrease of the stresses in the rice kernel during intermit tent drying. Less fissured rice was also observed by discontinuing the dryi ng process in the experiments. Higher intermittent ratio or lower unit dryi ng time caused lower percentage of fissured rice in the experiments.