Glass transition mapping inside a rice kernel
2004
Yang, W. | Jia, C.
Because of unevenness of moisture fields inside a rice kernel, the key to applying the glass transition hypothesis to explain fissure formation is to map glass transition zones inside rice kernels during the drying process based on the intra-kernel moisture content distribution generated by a finite element scheme. The simulations showed that glass transition zones initiated from a region close to the kernel surface. As drying progressed, these zones migrated gradually from the outer to inner layers of the kernel, progressively occupying a greater volume of the kernel. It was found that the glass transition zones had a corresponding relationship with the stress zones reported in the literature. Predicted maps of glass transition zones were used to explain the fissuring phenomena and identify the potential fissuring regions inside a rice kernel during the drying process.
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