Abstract:

The dynamic icing presents a porous structure. This microscopic pore structure is a key factor affecting its macroscopic physical properties. However, it is difficult to quantitatively characterize the three-dimensional pore structure with traditional methods. Aimed to describe the microcosmic characters objectively, a 3-D modeling approach of porous structure based on quantitative results of 2-D images is proposed in this paper. Firstly, the ratio of measuring scale between real and modeling size is studied and given, and its influence on resolution and modeling is also analyzed. Secondly, based on the porosity and diameter distribution, method to determine the amount and diameters of pores is presented. And the random approach of pores location is given. After these preparations, the 3-D porous structure of ice is formed by a matrix with element value 0 or 1. The experimental results demonstrate that the 2-D quantitative information of pores extracted from 3-D generated ice is highly similar to the real ice, which shows that the proposed approach is accurate and feasible. Through this paper, a new way to 3-D display, characters extraction and corresponding simulation of ice in microcosmic view can be provided.

Key words: dynamic icing, porous structure, porosity, pore diameter distribution, quantitative analysis

摘要：

动态结冰内部呈现多孔结构特点，这一微观孔隙结构是影响其宏观物性的关键因素，然而传统方法难以对三维孔隙结构进行定量表征。为了客观刻画结冰微观结构特征，提出了基于结冰二维图像定量信息的三维微观结构建模方法。首先，研究并确定了真实结冰尺寸与建模区域之间的比例关系，分析比例尺对分辨率和建模的影响；其次，结合二维孔隙率和孔径分布函数，提出了三维孔隙数量及其孔径的推导方法，并给定了孔隙位置随机生成方法；基于此，最终建立了以0-1矩阵形式表征结冰三维微观孔隙结构的方法。实验表明，所生成三维结冰模型的二维孔隙定量信息与实验结果吻合度较高，建模方法准确可行，为动态结冰三维刻画、微观特征参数提取和相关微观仿真模拟提供了新途径。

关键词: 动态结冰, 孔隙结构, 孔隙率, 孔径分布, 定量分析