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KMID : 0352719920160020111
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Journal of Ginseng Research
1992 Volume.16 No. 2 p.111 ~ p.123
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A Study on Drying Characteristics and Drying Model Development of Korean Ginseng
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Abstract
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Drying characteristic data for peeled ginseng were obtained to determine dominant drying factors and fitted with five selected drying modeis and an empirical model. Among air temperature. Relative humidity and diameter of ginseng root. Drying air
temperature was found to be the most influencing factor on drying rate. Drying. Rate. Drying velocity appeared faster as the drying temperature increased but its effect was less at high temperature than at low temperature. Quality change during
the
drying process did not occur except when relative humidity was 7.5%. At high relative humidity. Skin color of ginseng was turned to light brown Approximate-Diffusion and the Empirical model for drying were in a good agreement with experimental
data. The
models are as follows:
Approximate-Diffusion model
MR= A. exp(-k. t)
A=1.72+0.407ln(D)-0.00009663T*-0.358ln(RH)+0.0000945RH*
B=1.01+0.0195RH-0.00518D*+0.0708ln(T)-0.492ln(RH)-0.0000933RH*
Empirical model
MR-C1+C2.ln(t)
C1=1.14+0.382ln(D)-0.0000847T*-0.139ln(RH)+0.0000664RH*
C2=0.440-0.0224ln(D)-0.193ln(T)+0.0000464T*-0.00000771RH*
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KEYWORD
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