EFFECTS OF VARIOUS TREATMENTS ON THE DRYING KINETICS OF Muscatel GRAPES
作者:
G. Vázquez,
F. Chenlo,
R. Moreira,
A. Costoyas,
期刊:
Drying Technology
(Taylor Available online 2000)
卷期:
Volume 18,
issue 9
页码: 2131-2144
ISSN:0737-3937
年代: 2000
DOI:10.1080/07373930008917830
出版商: Taylor & Francis Group
关键词: Vitis vinifera L;drying;diffusional model;volumetric changes;effective coefficient of diffusion
数据来源: Taylor
摘要:
The drying kinetics of Muscatel grapes at 60°C and a relative air humidity of 22% were determined after various pretreatments had been applied to the grapes. The pretreatment parameters varied were the chemical agent (potassium carbonate solution with or without olive oil, or sodium hydroxide solution); the duration of pretreatment; and the temperature and concentration of the solution. A 3 minute pretreatment with an aqueous solution of K2CO3and olive oil at 60°C reduced drying time from about 80 h to 20 h. Optimal drying load corresponded to a single layer of almost close-packed grapes on each tray. The experimental drying kinetics were satisfactorily reproduced by a model in which both grape size and the effective coefficient of diffusion are functions of moisture content.
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