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Influence of the Dufour and Soret effects on the characteristics of evaporating liquid flows

机译：Dufour和Soret影响对蒸发液流特性的影响

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摘要

The characteristics of regimes of two-layer flows with diffuse evaporation in an infinite channel are studied in the frame of the Boussinesq approximation for the Navier - Stokes equations. A joint flow of an evaporating liquid and a co-current gas flux is simulated with the help of the exact solution of a special type for the convection equations. The effects of thermodiffusion and diffusive thermal conductivity are additionally taken into account to model the flow in the gas phase and in the boundary conditions on the thermocapillary interface and upper solid wall of the channel. The character and extent of the impact of the Soret and Dufour effects on the structure of the appearing regimes of evaporative convection is investigated at the example of HFE-7100 - nitrogen and ethanol - nitrogen systems. It is shown that these effects do not influence the topological structure of the flows but can lead to a qualitative change of the regime pattern. The Soret effect can cause significant variations of the vapor content in the system upon changing the liquid layer thickness and external thermal load, and result in the transformation of the phase transition mode (evaporation/condensation). The influence of the Dufour effect can be neglected. Critical characteristics of the stability for the flow under study are determined depending on the intensity of the thermodiffusion effects. The weak destabilizing influence of the Soret effect is ascertained for all the considered configurations.
机译：在Navier - Stokes方程的Boussinesq近似的框架中，研究了在无限沟道中具有漫射蒸发的两层流动的特征。借助于对流方程的特殊类型的精确溶液，模拟蒸发液的关节流量和副电流通量。另外考虑了热量的影响和漫射导热率以模拟气相中的流动和通道的热量普通界面和上固体壁的边界条件。在HFE-7100 - 氮气和乙醇 - 氮系统的实施例中研究了SORET和DUFOUR对蒸发对流的出现制度结构的影响的特征和程度。结果表明，这些效果不会影响流动的拓扑结构，但可能导致政权模式的定性变化。在改变液体层厚度和外部热负荷时，SORET效应会导致系统中的蒸汽含量的显着变化，并导致相变模式的变换（蒸发/冷凝）。可以忽略Dufour效果的影响。根据热处理效应的强度确定研究的流动稳定性的关键特征。所有被考虑的配置都确定了SORET效应的弱点稳定性影响。

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