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Micro-mechanics of wet solids in gas-solid contactors

气固接触器中湿固体的微观力学

基本信息

批准号：
214351323
负责人：
Professor Dr.-Ing. Stefan Heinrich
金额：
--
依托单位：
Department of Mechanical Engineering
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2013
资助国家：
德国
起止时间：
2012-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/214351323?language=en
关键词：
Micro mechanics wet solids gas

项目摘要

In this project, we will investigate the dynamic behaviour of gas-particle processes involving liquid injection. These systems are encountered in a wide variety of gas-solid contacting processes used in the chemical, pharmaceutical and food industries. It is well known that wet particles behave completely different from dry particles. Yet, a fundamental description of the dynamics of wet particles is predominantly missing. Two PhD students will mutually work on a quantitative description of wet particle dynamics through a combined experimental and numerical study. The first will work on development and application of collision experiments to perform a systematic parameter study of particle collisional behaviour depending on particle material properties, wettability, degree of wetting, impact velocity and physical properties. Two high speed cameras will be used to quantify the changes in velocity and the sticking of particles during a collision. The effects will be analysed due to solving of force and energy balances. The other PhD student will numerically study the mechanisms of particle collisions with the aid of an advanced computational model that describes the dynamics of a particle colliding with a wet wall or another dry or wet particle without any prior assumptions. Based on the experimental and numerical data we will be able to identify the mechanisms of energy dissipation, sticking and transfer of mass and momentum during a collision of a wet particle and to provide quantitatively descriptive closure equations that can be used in coarse grained DEM models. These can be used in the design, optimization and trouble shooting of gas-solid contactors involving liquid injection.

在这个项目中，我们将研究涉及液体喷射的气固两相过程的动态行为。这些系统在化工、制药和食品工业中使用的各种气固接触过程中都会遇到。众所周知，湿颗粒的行为与干颗粒完全不同。然而，对湿颗粒动力学的基本描述主要是缺失的。两名博士生将通过实验和数值研究相结合的方式，共同致力于湿颗粒动力学的定量描述。第一个项目将致力于碰撞实验的开发和应用，以对颗粒碰撞行为进行系统的参数研究，这些参数取决于颗粒材料的性质、润湿性、润湿程度、撞击速度和物理性质。两个高速摄像机将被用来量化碰撞过程中速度的变化和粒子的粘连。将分析由于解决了力和能量平衡而产生的影响。另一名博士生将借助一种先进的计算模型来数值研究粒子碰撞的机制，该模型描述了粒子与湿墙或另一种干或湿粒子碰撞的动力学，而不需要任何事先假设。基于实验和数值数据，我们将能够识别湿颗粒碰撞过程中质量和动量的能量耗散、粘连和传递机制，并提供可用于粗粒度DEM模型的定量描述闭合方程。这些结果可用于液体喷射式气固接触器的设计、优化和故障排除。