管内湍流传热传质耦合对过饱和度的影响

The Influence of Coupled Heat and Mass Transfer on Supersaturation in Turbulent Tube Flow

为了探究湍流情况下水汽相变传热传质耦合对管道内过饱和度的影响,使用Fluent用户自定义标量(UDS)对传热传质耦合模型进行计算,研究了在不同径向位置、空气温度、壁面温度、空气流速及湿度等因素下耦合项对管道中过饱和度分布的影响。结果表明:沿径向不同位置处,耦合项对过饱和度的影响有所不同;随着温差的增大,耦合项对过饱和度的影响也会增大,当温差增大到一定程度时,耦合项的影响不可忽略;在不同的进口空气流速及湿度下,耦合项对过饱和度的影响基本相同,温差的大小直接决定了耦合项对过饱和环境的影响。

In order to explore the influence of water vapor phase change heat and mass transfer coupling on the supersaturation in the pipeline under turbulent conditions,Fluent user-defined scalar(UDS)was used to calculate the heat and mass transfer coupling model,and the influence of the coupling term on the supersaturation distribution in the pipeline under some factors including different radial positions,air temperatures,wall surface temperatures,air velocities and humidity was studied.The results show that the influence of coupling term on supersaturation is different along different radial positions;With the increase of temperature difference,the influence of coupling term on supersaturation also increases;When the temperature difference increases to a certain extent,the influence of coupling term can’t be ignored;The influence of coupling term on supersaturation is basically the same under different inlet air velocities and humidity.The temperature difference directly determines the influence of the coupling term on the supersaturated environment.