Abstract The shrinkage-deformation (SD) behavior and mass transfer characteristics of white mushroom (Agaricus bisporus) pilei during osmotic dehydration (OD) were investigated. The morphometric characteristics of the product (including product contours, cross-sectional area and roundness) were obtained from digital images. Moreover, product contours were averaged to extract relevant deformation characteristics of osmodehydrated samples. An unsteady state 2D-diffusion model taking into account both radial and angular mass transfer, where product is shaped as a hemispherical shell was proposed to describe experimental data. Water and solute diffusivities in product were estimated with and without considering product shrinkage, defined as the shortening of radial dimension. Besides, diffusion coefficients were obtained using simplified models for both the proposed hemispherical shell geometry and a simpler sphere-shaped product, in the latter, under different similitude criteria. Estimated water and solute diffusivities reflecting dimensional changes of product were in the ranges of 1.1–4.6 × 10−10 and 1.5–1.8 × 10−10 m2/s, respectively, and are overestimated in about 39–113% for water and in about 24–66% for solute when shrinkage is not included in the OD model. Moreover, diffusion coefficients can also be corrected for geometry using the appropriate similitude criterion.

中文翻译：

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白蘑菇（双孢蘑菇）菌核在渗透脱水过程中的传质和形态特征分析

摘要 研究了白蘑菇（Agaricus bisporus）菌核在渗透脱水（OD）过程中的收缩变形（SD）行为和传质特性。从数字图像中获得产品的形态特征（包括产品轮廓、横截面积和圆度）。此外，平均产品轮廓以提取渗透水化样品的相关变形特征。考虑到径向和角质量传递的非稳态二维扩散模型，其中产品形状为半球形壳，被提议用来描述实验数据。在考虑和不考虑产品收缩（定义为径向尺寸的缩短）的情况下估计产品中的水和溶质扩散率。除了，扩散系数是使用所提出的半球壳几何形状和更简单的球形产品的简化模型获得的，后者在不同的相似性标准下。反映产品尺寸变化的估计水和溶质扩散率分别在 1.1-4.6 × 10-10 和 1.5-1.8 × 10-10 m2/s 的范围内，并且高估了约 39-113% 的水和约当收缩不包括在 OD 模型中时，溶质为 24-66%。此外，还可以使用适当的相似性标准来校正几何形状的扩散系数。分别为 6 × 10-10 和 1.5-1.8 × 10-10 m2/s，当收缩不包括在 OD 模型中时，水被高估了约 39-113%，溶质被高估了约 24-66%。此外，还可以使用适当的相似性标准来校正几何形状的扩散系数。分别为 6 × 10-10 和 1.5-1.8 × 10-10 m2/s，当收缩不包括在 OD 模型中时，水被高估了约 39-113%，溶质被高估了约 24-66%。此外，还可以使用适当的相似性标准来校正几何形状的扩散系数。