相连续非饱和多孔介质中水分迁移机理的探讨

Moisture Migration in Unsaturated Porous Media with Phase Continua

本文针对一个连续的相结构模式,分析了非饱和多孔介质中液、气两相的流动问题和水分的迁移机理,并对具有单自由蒸发表面的多孔体结构建立了一个简单易行的数学模型;提出了相应的数值计算方法.本文模型可用于预计自由蒸发制冷及热泵-土壤床埋管问题中水分的蒸发速率,并由此估算热量的抽取率.

The flow and moisture migration in unsaturated porous media based on a phase continuum mode are discussed. A simple mathematical model has been developed to describe the filtrating flow, the heat and mass transfer in porous beds with a single free evaporating surface. It is easy to perform numerical calculation for the explicit expressions for both the liquid and gas phases derived. Moisture migration and heat diffusion in engineering practice, such as in evaporative refrigeration and the soil bed with buried pipes, are estimated. Theoretical results are in good agreement with experimental data.