A diffusion model with a moisture dependent diffusion coefficient for parboiled rice

被引：28

作者：

Elbert, G

Tolaba, MP

Aguerre, RJ

Suárez, C ^{[1
]}

机构：

[1] Univ Buenos Aires, Fac Ciencias Exactas & Nat, Dept Ind, RA-1428 Buenos Aires, DF, Argentina

[2] Univ Nacl Lujan, Dept Tecnol, RA-6700 Buenos Aires, DF, Argentina

来源：

DRYING TECHNOLOGY | 2001年 / 19卷 / 01期

关键词：

variable diffusivity; drying; modeling; thin layer drying; activation energy; heat of desorption; biot number;

D O I：

10.1081/DRT-100001358

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

A mathematical model describing moisture migration by diffusion in a solid sphere with variable diffusion coefficient is proposed. An analytical expression for dependence of the diffusion coefficient with moisture content was derived based on the assumption that the activation energy for diffusion varies linearly with the desorption energy. The expression for moisture dependence of diffusion coefficient was used to simulate drying of parboiled rice in the temperature range 50-90 degreesC. The mathematical model shows good agreement between observed and predicted drying rate curves.

引用

页码：155 / 166

页数：12

共 19 条

[1] ENTHALPY-ENTROPY COMPENSATION IN SORPTION PHENOMENA - APPLICATION TO THE PREDICTION OF THE EFFECT OF TEMPERATURE ON FOOD ISOTHERMS [J].