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Paper Information

Journal:   JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN)   February 2006 , Volume 39 , Number 6 (94); Page(s) 733 To 744.
 
Paper: 

DRAG REDUCTION OF SUBMERGED BODIES USING POLYMERIC COATINGS

 
 
Author(s):  SADEGHY K.*, GHOLAMZADEH N.
 
* Dept. of Mechanical of Engineering, Faculty of Engineering, University of Tehran
 
Abstract: 

In this paper, the applicability of polymeric coatings to reduce the drag experienced by submerged ax symmetric bodies was investigated experimentally. Two different commercial polymeric coatings were used for this study: 1) Polyacrylamide (PAA), and 2) Polydemethyl siloxane (PDS). Whereas the first polymer is water-soluble; in contrast, the second polymer is hydrophobic. Drag measurements were conducted on a model of the body of interest with a geometrical scale of 1/10. A home-made water column device was used to obtain drag data at Reynolds numbers up to 20,000 (large enough for the annular flow between the exterior of the model and the interior wall of the test cell to be taken as turbulent). Extensive test results obtained using this device revealed that both polymers are effective in reducing the drag coefficient in the range of 20-30 %. The effectiveness of PAA coating, however, was realized not to be steady apparently because of its being washed away by the flowing water. In contrast, steady drag reduction was found to be achievable using the PDS coating.

 
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