On the Use of a Home-Made Water Column for Evaluating the Drag Reduction Efficiency of Polymeric Coatings in External Flows
Publish place: 18th Annual Conference of Mechanical Engineering
Publish Year: 1389
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
ISME18_162
تاریخ نمایه سازی: 1 تیر 1389
Abstract:
The efficiency of a new polymeric coating called polydimethylsiloxane (PDMS) in reducing the friction drag in external flows has been investigatedexperimentally using a home-made water column. To that end, a scaled 1/5 model of a typical axisymmetric body of a given shape was fabricated from aluminum and placed in the test cell of the water column. The drag exerted on the model was measured using a calibrated load cell at different Reynolds numbers with and without the polymeric coating. The difference between the two sets of data, at the same Reynolds number, shows that this particular polymer coating is well capable of reducing the friction drag by as much as 2 to 3%. The results obtained in this work also shows that the water column developed in the present work competes well with conventional drag-measuring devices such as water tunnels and towing tanks in terms of accuracy.
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Authors
S. Jafargholinejad
University of Tehran
K. Sadeghy
University of Tehran
F. Atabaki
Malek-ashtar University of Technology
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