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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.
In this paper, for a continuous phase structure model, the flow problems of liquid and gas phases and the migration mechanism of water in unsaturated porous media are analyzed. A simple mathematical model is established for the porous structure with a single free-evaporating surface The corresponding numerical calculation method is proposed.The model can be used to estimate the evaporation rate of water in free-evaporative cooling and heat pump-soil bed buried pipe and estimate the heat extraction rate.