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

多孔介质的干燥是许多环境和工程应用的核心。在此背景下，该项目的目标是在毛细多孔介质中干燥过程的建模方面取得重大突破。这项工作将基于最先进的孔网络模拟、孔网络模拟和新的实验相结合的基础上。考虑到蒸汽的非局部平衡条件以及渗流和非渗流液团的区别，将建立两方程和三方程的连续介质模型。将开发孔隙网络模型以执行高性能计算(HPC)模拟，这是满足允许从孔隙网络模拟计算连续介质模型参数的长度尺度分离约束所必需的。将进行溶解物种(盐)干燥的实验，以获得该项目中所开发的孔隙网络和连续介质模型的额外验证，注意，在许多应用中，在液体中存在溶解物种的情况是至关重要的。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形成的次级毛细结构的影响。

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.