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Vortex structures, heat ransfer and surface optimization of dimpled surfaces

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.1410
pages 1378-1389

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

Egon Hassel
Institute for Technical Thermodynamics Faculty of Mechanical Engineering and Marine Technology University of Rostock Albert-Einstein-Str. 2, D-18059 Rostock, Germany


Vortex structures and heat transfer in turbulent flow over dimpled surfaces in a narrow channel at Reynolds number ReH = 13042 are investigated using numerical and experimental methods. Change of the dimple depth shows major impact on vortex formations and integral heat transfer rates which are analyzed in detail using LES method. The thermo-hydraulic performance, the ratio of heat transfer enhancement to pressure loss, shows its optimum for dimples with a ratio of dimple depth to dimple print diameter at h/d = 0.26. A genetic algorithm method is coupled with CFD method to design surfaces with a maximum of heat transfer enhancement and a minimum pressure loss. The disadvantages of the traditional trial and error process are avoided. Since genetic algorithms require a large number of computations, a novel mesh generation method based on mesh motion functionality and a field interpolation procedure to reduce convergence time has been integrated in the optimization process. In result, the heat transfer rates could be increased up to 2% and the pressure loss minimized up to 21% compared to the standard dimple configuration.

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