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首页> 外文期刊>International journal of green energy >Indirect forced solar drying of banana slices: phenomenological explanation of non-isotropic shrinkage and color changes kinetics
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Indirect forced solar drying of banana slices: phenomenological explanation of non-isotropic shrinkage and color changes kinetics

机译：香蕉片间接强制太阳干燥：非各向同性收缩和颜色变化动力学的现象学解释

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摘要

Solar drying technology is a noteworthy technique as it uses the renewable solar energy. In this study, thin slices of banana were dried by using an indirect forced solar dryer at air mass flow rates of 0.016, 0.041, and 0.082kg s(-1). In order to assess the kinetics of shrinkage and color changes, image processing technique was applied for determining area, volume, density, total color difference and browning index. Shrinkage factor of the samples was less than 1 during drying indicating non-isotropic shrinkage with contraction of inner voids. Furthermore, product shrinkage showed two descending drying steps in which the volume change was more than the evaporated water volume in the first step and equal to that in the second step. The dimensionless evaporated water volume with respect to the dimensionless volume difference of the product also revealed that two steps of volume change existed during drying separated at critical moisture ratio 0.23. The area and volume changes were only related to the product moisture content and were independent of the air mass flow rate, and hence air temperature. In contrary to the browning index, the total color difference was not influenced by air mass flow rate and the least change in browning index occurred at mass flow rate of 0.041kg s(-1).
机译：太阳能干燥技术是一项值得注意的技术，因为它使用可再生太阳能。在这项研究中，香蕉片通过使用间接强制太阳能干燥机以0.016、0.041和0.082kg s（-1）的空气质量流量进行干燥。为了评估收缩和颜色变化的动力学，图像处理技术被用于确定面积，体积，密度，总色差和褐变指数。样品在干燥过程中的收缩率小于1，表明非等向收缩性和内部空隙的收缩。此外，产品收缩率显示出两个下降的干燥步骤，其中体积变化大于第一步的蒸发水体积，而等于第二步的变化。相对于产品的无量纲体积差的无量纲蒸发水体积还表明，在干燥期间以临界水分比0.23分离存在两步体积变化。面积和体积变化仅与产品含水量有关，并且与空气质量流量以及空气温度无关。与褐变指数相反，总色差不受空气质量流量的影响，在质量流量为0.041kg s（-1）时，褐变指数的变化最小。

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