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Direct Numerical Simulation of Film Flows on Microstructured Surfaces with absorption of a gas phase

气相吸收微结构表面薄膜流动的直接数值模拟

基本信息

批准号：
392533833
负责人：
Professor Dr.-Ing. Jens-Uwe Repke
金额：
--
依托单位：
Fachgebiet Dynamik und Betrieb technischer Anlagen
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2017
资助国家：
德国
起止时间：
2016-12-31 至 2021-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/392533833?language=en
关键词：
Direct Numerical Simulation Film Flows

项目摘要

Structured high-performance packing, as found for example in packed columns, and falling film evaporators can have microstructures on the overflown surfaces with geometrical dimensions in the same order of magnitude as the thicknesses of liquid trickle films (< 1 mm). The characterization of the mass transport coupled with the fluid dynamics in the liquid trickle film is very important for the precise description of these multiphase process engineering apparatuses. Since the experimental analysis of the flow over and around the various surface structures, particularly without further influencing the flow, is very involved and complex, the reasons for the dependence are insufficiently researched. During the first project phase the influence of the microstructures on the hydrodynamik was successfully researched. Based on that the aim of this research project is therefore the systematic investigation of the influence of individual and periodically arranged microstructures on the hydrodynamics of liquid film flow and absorption of a gaseous component using Direct Numerical Simulation. In doing so, fundamental research to answer the question How do microstructures influence the mass transport in film flows? will be undertaken. For the simulations, the complete Navier-Stokes equations and no further simplified models for turbulent flows as well as momentum and mass transport between the phases are used. Through the resolution of all occurring length and time scales the cross-mixing in the film and the dynamics of the interfacial surface can be observed very closely and the influence of various microstructures on the mass transfer can be systematically investigated. The simulations are expected to deepen the basic understanding of the influence of the microstructures on the flow and the mass transport. Moreover, these fundamental investigations can elucidate the semi-empirical equations for the dimensioning of columns and extend the scientific knowledge to, for example, give details on the design of novel surfaces.

结构化的高性能填料，例如在填料塔和降膜蒸发器中发现的，可以在溢流表面上具有微结构，其几何尺寸与液体滴流膜的厚度（< 1 mm）处于相同的数量级。液滴膜中质量传递与流体动力学耦合的特性对于精确描述这些多相过程工程装置是非常重要的。由于各种表面结构上和周围的流动的实验分析，特别是在不进一步影响流动的情况下，是非常复杂和复杂的，因此对相关性的原因没有进行充分的研究。在第一个项目阶段，成功地研究了微观结构对流体力学的影响。基于此，本研究项目的目的是系统地研究单个和周期性排列的微结构对液膜流动的流体力学和使用直接数值模拟的气体组分的吸收的影响。在这样做的基础上，研究来回答这个问题：微结构如何影响膜流中的质量传输？将进行。对于模拟，完整的Navier-Stokes方程和湍流以及相之间的动量和质量传输没有进一步的简化模型被使用。通过所有发生的长度和时间尺度的分辨率的交叉混合在膜和界面表面的动态可以非常密切地观察和各种微观结构的影响，可以系统地研究传质。通过数值模拟，加深了对微结构对流动和传质影响的基本认识。此外，这些基本的调查可以阐明半经验方程的尺寸列和扩展的科学知识，例如，提供细节的设计新颖的表面。