扩散系数是传质过程的一个重要参数。
Diffusivity is an important parameter of the mass transfer process.
谷物干燥是一个复杂的传热传质过程。
Grain drying is a complex and unstable process of heat and mass transfer.
并用该模型对逆流密闭式冷却塔内部传热、传质过程进行了模拟。
The model is used to simulate the heat and matter transfer in closed-wet tower.
因此，对PEMFC 内的流动和传质过程的数值模拟研究，具有重要的工程意义与学术意义。
So the simulations of flow and mass transfer processes for PEMFC is very important.
归纳了渗透蒸发过程的传质机理与模型；
The mass transfer mechanism and model involved in pervaporation process are summarized.
通过双膜理论分析得知，滴外传质是萃取过程的控制步骤。
Double film theory shows that the mass transfer outside the droplets is the controlling step.
探讨并建立了植物有效成分提取液膜分离过程传质模型。
The mass transfer model of membrane separation is discussed and then set up.
探讨并建立了植物有效成分提取液膜分离过程传质模型。
The mass transfer model of membrane separation is discussed and then set up.
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