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Multiphase Eulerian-Lagrangian LES of particulate fouling on structured heat transfer surfaces

DOI: 10.1615/THMT-18.780
pages 739-743

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

Abstrakt

This paper is addressed to the application of Eulerian-Lagrangian Large Eddy Simulations (LES) for the investigation of particulate fouling on structured surfaces, an important research field in context of particleladen two-phase flows. An efficient Lagrangian-Particle-Tracking algorithm is used to predict the trajectory of each suspended foulant particle (dispersed phase), suitable for dilute and dense dispersed two-phase flows by taking the fluid-particle (two-way coupling) as well as inter-particle interactions (four-way coupling) into account. The complex turbulent carrier flow (continuous phase) is calculated by eddy-resolving LES. Calculations have been performed for fully developed turbulent channel flows at moderate Reynolds numbers in combination with a sharp-edged spherical dimple considering a dimple depth/diameter ratio of t/D = 0.26 and a rectangular cavity with an equal cavity depth/side length ratio for comparative purposes. Additionally, the simulated fouling layer distribution for a spherical dimple within a smooth, narrow channel is compared with experimental measurements and exhibits a satisfying agreement.

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