The flow over a blunt disk placed in a stream of air was investigated by means of detailed velocity measurements employing Laser-Doppler-Anemometry (LDA). Special attention was spent to the effect of incidence. This parameter governed the location of the stagnation point and the length of the separation bubble. For a parallel disk with finite thickness, a large separation bubble was formed at the leading edge, followed by reattached regions of the turbulent flow. With increasing incidence, the length of the separation bubble significantly decreased, and the stagnation point moved from the blunt side to the leading edge. For angle of incidence higher than a special transition value, a stagnation flow over the disk surfaces resulted without significant turbulence. In case of a heated disk, the corresponding transition of the mean convective heat transfer coefficient as function of incidence was very sharp and discontinuous.
- Fluids Engineering Division
Flow Over a Blunt Disk With Incidence: Location of Stagnation Point and Flow Separation
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Helcig, C, Uhkoetter, S, & aus der Wiesche, S. "Flow Over a Blunt Disk With Incidence: Location of Stagnation Point and Flow Separation." Proceedings of the ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels. Volume 1C, Symposia: Fundamental Issues and Perspectives in Fluid Mechanics; Industrial and Environmental Applications of Fluid Mechanics; Issues and Perspectives in Automotive Flows; Gas-Solid Flows: Dedicated to the Memory of Professor Clayton T. Crowe; Numerical Methods for Multiphase Flow; Transport Phenomena in Energy Conversion From Clean and Sustainable Resources; Transport Phenomena in Materials Processing and Manufacturing Processes. Chicago, Illinois, USA. August 3–7, 2014. V01CT15A004. ASME. https://doi.org/10.1115/FEDSM2014-21181
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