Determination of moisture diffusivity in porous media using moisture concentration profiles

被引：85

作者：

Pel, L ^{[1
]}

Brocken, H ^{[1
]}

Kopinga, K ^{[1
]}

机构：

[1] EINDHOVEN UNIV TECHNOL,DEPT PHYS,5600 MB EINDHOVEN,NETHERLANDS

来源：

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 1996年 / 39卷 / 06期

关键词：

D O I：

10.1016/0017-9310(95)00201-4

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

A procedure is presented to determine the moisture diffusivity for drying from measured moisture concentration profiles. From error analysis iris shown that the applied space grid for scanning and the one-dimensional resolution of the NMR (nuclear magnetic resonance) method used for the measurements had a minor influence on the accuracy of the determination of the moisture diffusivity. The inaccuracy was dominated by experimental noise and inhomogeneities in the porosity of the materials under investigation. A receding drying front method is presented to determine the moisture diffusivity at low moisture contents: here the moisture transport is dominated by vapour transport, which limits the overall drying rate. The method uses the velocity of the receding drying front to approximate the moisture diffusivity.

引用

页码：1273 / 1280

页数：8

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