Cleaning mechanisms of immerged systems

浸入式系统的清洁机制

• 批准号: 326771530
• 负责人: Professor Dr.-Ing. Markus Böl
• 金额: --
• 依托单位: Institut für Chemische und Thermische Verfahrenstechnik
• 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 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/326771530?language=en
• 关键词: Cleaning; mechanisms; immerged; systems

The cleaning process of fouled organic material on heat transfer surfaces is a complex interaction of interfacial interactions, mass transfer, heat transfer, fluid forces and chemical reactions, which is not fully understood at present. The main objective in this research project is to achieve a fundamental knowledge of the cause-effect relationships in the cleaning of immersed systems. Whey protein in the form of WPI gel are to be used as a representative model fouling system. The research project is divided into three parts. The first part comprises the investigation of all material properties which are relevant for a cleaning process, specifically strength, viscoelastic characteristics, diffusion coefficient, surface topography, adhesion and cohesion force. These material parameters will be used in the second part of the project. Here a fundamental data base for a continuum-mechanical FEM model of the fouling layer will be set up. The fluid phase will be simulated with a fluid-structure interaction model (FSI) model, so that the cleaning process of WPI can be simulated. To validate and improve the FSI model, two established methods, namely fluid dynamic gauging (FDG) and local phosphorescence detection (LPD), are used in the third part. The FDG method enables to investigate the three stages of the cleaning process, swelling stage, uniform stage and decay stage. In combination with a particle size analyzer the particle size of removed particles can be determined. With the LPD method, it is possible to locally determine the cleaning time in different flow geometries under laminar and turbulent flow conditions. By correlation of the specific light intensity and the fouling layer thickness a removal rate as well as a change of the layer thickness can be quantified. The modeling approach will be developed further and based on this FSI model a tailored and system-specific cleaning strategy can be designed and validated. Furthermore well-established methodological approaches will be available, which can then be applied to any fouling layer.

传热表面有机污染物的清洗过程是一个复杂的界面相互作用、传质、传热、流体力和化学反应的相互作用过程，目前尚未完全了解。本研究项目的主要目标是获得浸没式系统清洁中因果关系的基本知识。WPI凝胶形式的乳清蛋白被用作代表性的模型结垢系统。该研究项目分为三个部分。第一部分包括与清洁过程相关的所有材料特性的研究，特别是强度、粘弹性特性、扩散系数、表面形貌、粘附力和内聚力。这些材料参数将用于项目的第二部分。在此基础上，建立了污垢层连续力学有限元模型的基本数据库。采用流固耦合模型（FSI）对流体相进行模拟，从而对WPI的清洗过程进行模拟。为了验证和改进FSI模型，在第三部分中使用了两种已建立的方法，即流体动态测量（FDG）和局部磷光检测（LPD）。FDG方法能够研究清洗过程的三个阶段，即溶胀阶段、均匀阶段和衰减阶段。结合粒度分析仪，可以确定去除颗粒的粒度。使用LPD方法，可以在层流和湍流条件下局部确定不同流动几何形状的清洁时间。通过比光强度和污垢层厚度的相关性，可以量化去除速率以及层厚度的变化。建模方法将进一步发展，并基于该FSI模型，可以设计和验证定制的系统特定的清洁策略。此外，将提供完善的方法学方法，然后可以将其应用于任何污垢层。