DOI: 10.1615/ICHMT.2015.THMT-15
ISBN Print: 978-1-56700-427-4
ISBN CD: 978-1-56700-428-8
Simulation of particle fouling and its influence on friction loss and heat transfer on structured surfaces using phase changing mechanism
ABSTRACT
A new approach to determine fouling layer growth on structured surfaces based on Lagrange-Particle-Tracking is presented. Settled particles attach the fouling layer and are transferred into a second (fouling) phase enhancing the phase fraction inside the actual cell which causes additional friction losses and heat transfer resistance. The vortex formations and its direct impact on fouling probability and thus heat transfer of turbulent flow over a single dimple and cavity are analyzed and compared to results obtained for a clean surface. Simulations show excellent results with respect to accuracy and computation time in comparison to existing models e.g. Kern and Seaton while reducing the number of predefined constants significantly. To overcome large time scales in fouling related issues, a logarithmic extrapolation algorithm of the fouling layer growth has been applied.