Abstract

The removal of film-like deposits is a challenge in many fields of production. For environmental and economic reasons, the cleaning processes need to be optimized. An optimization by means of computational fluid dynamics seems to be beneficial, but is subject to some restrictions, especially in industrial context. General modeling ideas, a subdivision into sub-processes and the significance of time dependent soil behavior are discussed as well as specific concepts related to four basic cleaning mechanisms, namely diffusive dissolution, cohesive separation, viscous shifting and adhesive detachment. Cleaning experiments in fully developed plane channel flow, resembling a simplified plate heat exchanger, are performed with model soils (starch, petroleum jelly, ketchup) which were chosen to represent an almost ideal form of one of the basic cleaning mechanisms.

摘要

去除薄膜状沉积物是许多生产领域的挑战。出于环境和经济原因，需要优化清洁过程。通过计算流体动力学进行优化似乎是有益的，但受到一些限制，尤其是在工业环境中。讨论了一般建模思想、子过程的细分和随时间变化的土壤行为的重要性，以及与四种基本清洁机制相关的具体概念，即扩散溶解、内聚分离、粘性转移和粘合剂分离。在完全发展的平面通道流中进行清洁实验，类似于简化的板式换热器，使用模型土壤（淀粉、凡士林、