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Date of Publication:2017-01-01

Journal:大连理工大学学报

Issue:4

Page Number:345-351

ISSN No.:1000-8608

Abstract:Based on the extended Darcy seepage model,the energy and mass conservation equations are coupled together by volume average hypothesis to simulate the dehydration process in thermal insulation material subject to severe temperature change environment.The mathematical model is developed to simulate the process of convection dehydration by air of 20% relative humidity (at 24 ℃) and dry air respectively.The changing regularities of the temperature,water vapor concentration, liquid water and ice at different time are analyzed.The research results show that the extended Darcy seepage model can reflect the nonlinear flow characteristics of water vapor during air flows over the porous thermal insulation materials.Two kinds of ventilation modes can effectively reduce moisture accumulation in the porous thermal insulation materials subject to severe temperature change environment,and the dehydration rate can reach 70% and 90% respectively.

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