A simplified model for determination of moisture diffusivity of date from experimental drying curves

被引：32

作者：

Kechaou, N

Maâlej, M

机构：

[1] Ecole Natl Ingn Sfax, Sfax 3038, Tunisia

[2] Fac Sci Tunis, Tunis 1002, Tunisia

来源：

DRYING TECHNOLOGY | 2000年 / 18卷 / 4-5期

关键词：

date; drying curve; modelisation; moisture diffusivity; Tunisia;

D O I：

10.1080/07373930008917758

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Experimental drying curves for Tunisia Deglet Nour dates were obtained in a laboratory dryer under different drying conditions. The air temperature was varied from 30 to 69 degrees C, relative humidity from 11.6 to 47.1% and air velocity from 0.9 to 2.7 m/s. A numerical method to obtain a solution of a diffusion equation in which the diffusivity depends upon temperature and moisture content has been proposed to investigate the moisture movement in a date by assuming the sample to be a homogenous infinite cylinder. To find the fitting moisture and temperature dependent diffusivity, the calculated drying curves are compared with the observed drying curves and an empirical equation for the moisture diffusivity of the date has presented as a function of temperature and moisture. It has been shown that the moisture distribution in the date during drying can be obtained by using the empirical equation presented.

引用

页码：1109 / 1125

页数：17

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