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Theoretical and practical approach to improve the film flow of the flywheel experiment

Bosscher, H.H. (2014) Theoretical and practical approach to improve the film flow of the flywheel experiment.

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Abstract:Background: The high speed impingement of water droplets on a thin water film is important for industrial purposes. The Multiphase Flow and Icing Department of the Institute of fluid mechanics in Braunschweig is currently focussed on the research of droplet impingement on thin films. To test the high speed impingement a flywheel with a paddle attached is being used. On the paddle a canal shaped geometry is placed from which the thin film will build on the paddle. Goal of the research is to find a canal shape which will result in a laminar smooth film on the paddle with high rotational velocity of the flywheel. Results: Different tiny canal shapes have been designed with the use of theory found in a literature research. The shapes have been produced with a 3D printer and have been adapted by hand so they could be placed in the paddle. Two experiments have been performed. In the first experiment the geometry that would lead to the qualitative best film has been selected for a static situation. In the second experiment this one geometry has been tested for a rotating flywheel, rotating at a high velocity. The flywheel reaches hereby a velocity corresponding to a Weber number of 10000. Conclusions: The geometry resulting in a laminar film in the static experiment doesn’t have the same results in the rotating situation. The geometry only leaves a laminar film on the paddle at low rotational velocities. When the rotational velocity of the flywheel becomes higher the film shows much turbulence and the film even separates from the paddle. Possible causes for this failure could be debris in the outlet of the geometry or bad finishing of the geometry.
Item Type:Internship Report (Master)
TU Braunschweig, Germany
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Mechanical Engineering MSc (60439)
Keywords:film, flow, flywheel experiment
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