Hot-air Drying Kinetics of Yam Slices under Step Change in Relative Humidity

文献类型： 外文期刊

第一作者： Ju, Hao-Yu

作者： Ju, Hao-Yu;Xiao, Hong-Wei;Gao, Zhen-Jiang;Ju, Hao-Yu;Zhang, Qian;Mujumdar, A. S.;Fang, Xiao-Ming

作者机构：

关键词： yam slices;drying kinetics;mathematical model;SEM;rehydration ratio

期刊名称：INTERNATIONAL JOURNAL OF FOOD ENGINEERING （ 影响因子：1.713； 五年影响因子：1.637 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： The drying kinetics and mathematical modeling of hot-air drying of yam slices were investigated under two-stage relative humidity (RH) control strategy with 60 C and 1.5 m/s as its constant drying temperature and air velocity, respectively. Results indicate high RH in the initial stage results in high samples temperature that enhances water diffusion in the falling rate drying period. Within the scope of current work, change in RH in the later drying period has insignificant influence on samples temperature rise while low RH can accelerate the drying rate. Compared to drying at constant 20% RH at the same drying air temperature, the drying strategy of using 40% RH over the first 15 min and then lowing to 20% RH for the remainder time yields a shorter drying time. Weibull model adequately described the moisture content variation with time for all experiments with the scale parameter ranging from 105.02 to 122.38 min and the values of shape parameters from 0.988 to 1.183. The effective moisture diffusivity determined from the Weibull model varied from 2.032 to 2.610 X 10~(-8)m~2/s. The rehydration ratio increased as the overall drying time was reduced. Microstructure examination shows that higher RH in the initial drying stage can lead to a more porous microstructure which enhances drying, while fast drying rate in the initial drying period generates a crust layer which hinders drying.

分类号： TS2

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