A SIMPLIFIED MODEL FOR DETERMINATION OF MOISTURE DIFFUSIVITY OF DATE FROM EXPERIMENTAL DRYING CURVES
作者:
N. Kechaou,
M. Maâlej,
期刊:
Drying Technology
(Taylor Available online 2000)
卷期:
Volume 18,
issue 4-5
页码: 1109-1125
ISSN:0737-3937
年代: 2000
DOI:10.1080/07373930008917758
出版商: Taylor & Francis Group
关键词: date;drying curve;modelisation;moisture diffusivity;Tunisia
数据来源: Taylor
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°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 rind 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.
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