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Indexed by:期刊论文

Date of Publication:2022-06-29

Journal:大连理工大学学报

Volume:58

Issue:3

Page Number:221-228

ISSN No.:1000-8608

Abstract:Based on the assumption of thermodynamic equilibrium and combined with dynamic boundary conditions,a mathematical model is developed to simulate moisture migration and three state phase transition process in porous insulation material under large temperature difference,and it is verified by the sponge drying experiment.In the modeling,the effect of natural convection caused by temperature difference is considered.The analysis is conducted on the distribution characteristics of temperature,water vapor concentration,the volume fraction of liquid water and ice in the sponge with evolution of time.The influence of physical parameters on the moisture transfer process is discussed.Finally,it is concluded that the model could accurately predict the process of moisture transfer in porous media under large temperature difference,and from the analysis of physical parameters,the porosity and effective diffusion coefficient are the key factors to affect the moisture transfer in porous insulation material,and the effective thermal conductivity has a lesser impact.

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