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NUMERICAL MODELING OF FOULING PROCESSES ON STRUCTURED SURFACES

J. Klunker
Chair of Modeling and Simulation, Department of Mechanical Engineering and Shipbuilding, University of Rostock, A-Einstein-Str. 2, D-18059 Rostock, Germany

Johann Turnow
Chair of Modeling and Simulation, Department of Mechanical Engineering and Marine Technology, University of Rostock, Albert-Einstein-Str. 2, 18055 Rostock, Germany

Nikolai Kornev
Chair of Modeling and Simulation, Department of Mechanical Engineering and Marine Technology, University of Rostock, Albert-Einstein-Str. 2, 18055 Rostock, Germany

Résumé

Concerning the operation of a heat exchanger, there are many problems that decrease the efficiency and result high economic costs (Petermeier (2003)). One of the most serious problems is the deposition of undesired particles, which is called particle fouling. The main disadvantages are a higher pressure loss along the heat exchanger and the reduction of heat transfer. Therefore, it is important to consider fouling in the designing process. This paper deals with the capability of numerical simulations to investigate and predict the growing of a fouling layer in heat exchangers. Regarding this aim, a new numerical method was developed and used for the investigation of structured surfaces. The main challenge in numerical simulations is to reduce the calculation time with a simultaneous high accuracy and representation of the physical behaviour. This paper introduce a new numerical method based on particle motion which is able to simulate the growing of a fouling layer caused by particle fouling as well as it consider the flow next to the fouling layer and the heat transfer through the fouling and liquid phase. Furthermore, the presented model depends on less constants than other common models with a simultaneous bigger range of functionality. Additionally, the used constants are not depending on the geometry, only on the matter properties.