论文标题
在蒸发和凝结过程中的分子图和界面温度不连续性上
On the Molecular Picture and Interfacial Temperature Discontinuity During Evaporation and Condensation
论文作者
论文摘要
尽管在实验上已经表明，蒸发和凝结期间液体蒸气界面存在温度不连续性，但对这种温度跃升的定量建模一直很困难。经典的schrage方程没有提供足够的信息来确定界面温度的跃升。从Boltzmann传输方程式开始，本文建立了三个界面边界条件，以将液体蒸气接口处的温度，密度和压力连接到界面质量和热通量：一个用于质量通量（Schrage方程），一个用于热量通量，用于密度不良的第三次。这些表达式可以很容易地耦合到液体和蒸气相的连续体中的热和质量传输方程，从而确定界面温度，密度和压力跳跃的值。与过去的实验进行比较是有利的。还提出了一种模仿电子热发射的热分子发射模型，以获得对热蒸发过程的分子水平的更多见解。
Although it has been shown experimentally that a temperature discontinuity exists at the liquid-vapor interface during evaporation and condensation, quantitatively modeling this temperature jump has been difficult. The classical Schrage equation does not give enough information to determine the interfacial temperature jump. Starting from the Boltzmann transport equation, this paper establishes three interfacial boundary conditions to connect the temperature, density, and pressure jumps at the liquid-vapor interface to the interfacial mass and heat fluxes: one for the mass flux (the Schrage equation), one for the heat flux, and the third for the density discontinuities. These expressions can be readily coupled to heat and mass transport equations in the continuum of the liquid and the vapor phases, enabling one to determine the values of the interfacial temperature, density, and pressure jumps. Comparison with past experiments is favorable. A thermomolecular emission model, mimicking thermionic emission of electrons, is also presented to gain more molecular-level insights on the thermal evaporation processes.
