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Advanced drying theory of capillary porous media from high-performance-computing pore network simulations

来自高性能计算孔隙网络模拟的毛细管多孔介质的先进干燥理论

基本信息

批准号：
316902770
负责人：
Professor Dr.-Ing. Evangelos Tsotsas
金额：
--
依托单位：
Lehrstuhl für Thermische Verfahrenstechnik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2016
资助国家：
德国
起止时间：
2015-12-31 至 2019-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/316902770?language=en
关键词：
Advanced drying theory capillary porous

项目摘要

Drying of porous media is central to many environmental and engineering applications. In this context, this project aims at performing a major breakthrough in the modelling of the drying process in capillary porous media. The work will be based on a combination of state of the art pore network modelling, pore network simulations and new experiments.Two- and three-equation continuum models will be developed taking into account the non-local equilibrium condition of the vapour and from the distinction between the percolating and non-percolating liquid clusters. The secondary capillary structures corresponding to the liquid trapped in various geometrical singularities of the pore space will be characterised experimentally and from numerical simulations and will be taken into account as a distinct and specific phase in the continuum models.The pore network models will be developed so as to perform high performance computing (HPC) simulations, which is necessary to meet the length scale separation constraints allowing the computation of continuum model parameters from pore network simulations.Experiments of drying with a dissolved species (salt) will be performed in order to obtain additional validation of the pore network and continuum models developed in the project, noting that situations where a dissolved species is present in the liquid are of paramount importance in many applications. In the present project, the formation and distribution of salt crystallisation spots will be used as key validation factors of the models and as physical signatures of the drying process, especially as regards the impact of the secondary capillary structures developing during drying.

多孔介质的干燥是许多环境和工程应用的核心。在这种情况下，该项目的目的是在毛细多孔介质中的干燥过程建模方面取得重大突破。这项工作将基于最先进的孔隙网络建模、孔隙网络模拟和新的实验相结合，考虑到蒸气的非局部平衡条件以及蒸发和非蒸发液体团簇之间的区别，将开发两方程和三方程连续模型。将通过实验和数值模拟来表征与孔隙空间的各种几何奇异性中捕获的液体相对应的二级毛细结构，并将其作为连续模型中的独特和特定相加以考虑。将开发孔隙网络模型，以便进行高性能计算（HPC）模拟，这是必要的，以满足长度尺度分离的限制，允许计算连续模型参数的孔隙网络模拟。将进行，以获得额外的验证孔隙网络和连续模型中开发的项目，注意到的情况下，溶解的物种是目前在液体中是至关重要的，在许多应用。在本项目中，盐结晶点的形成和分布将被用作模型的关键验证因素和干燥过程的物理特征，特别是关于干燥过程中二级毛细管结构的影响。