Knudsen diffusion model and the mixed flow model were solved numerically for the ethanol - water system . good agreement between experimental and theoretical values was found . but the mixed flow model is better 乙醇水溶液的vmd试验表明,两种组分同时通过膜微孔时, knudsen扩散模型和过渡流模型都基本能反映实际过程,但过渡流模型更接近实际情况。