EXPERIMENTAL METHOD FOR DRAG REDUCTION BY COMPLIANT COATING
Publish place: 11th National Symposium of Marine Industries
Publish Year: 1388
نوع سند: مقاله کنفرانسی
زبان: English
View: 2,563
This Paper With 7 Page And PDF Format Ready To Download
- Certificate
- من نویسنده این مقاله هستم
استخراج به نرم افزارهای پژوهشی:
شناسه ملی سند علمی:
NSMI11_021
تاریخ نمایه سازی: 30 مرداد 1388
Abstract:
The drag coefficients on discs rotating in a cylindrical tank has studied relation to the nature of a composite coating attached to the underside of the disc, and direct comparisons were made with refrence discs of identical geometry which were completely rigid. The composite coating was formed by: (1) bonding of velvet fabric to the metal disc with velour face outward, (2) casting a premixed silicone composition over the velvet fabric, (3) covering the silicone layer with a thin , stiff polymer film. As a result of the tests in certain cases drag coefficient was reduced by 20% or more as compared to refrence rigid discs. Two conclusions are possible: (1) True reduction of energy exchange in the turbulent boundary layer was achived , perhaps by damping of the turbulent of bursting process; (2) A significant increase in the laminar region at the center of disc was obtainded (transition of laminar to turbulent delayed) . The stiffness of the top film influenced the performance of the coating. The change of drag coefficient of discs to be strongly influenced by the dynamic mechanical properties of the silicone elastomer network
Keywords:
Authors
Ahmad Fakhar
Assistant professor . Azad University of Kashan Iran,
M Rad
professor, Sharif Univ. of Tech.,Tehran, Iran
SH Afkhami
A.professor , University of Toronto, Canada,
مراجع و منابع این Paper:
لیست زیر مراجع و منابع استفاده شده در این Paper را نمایش می دهد. این مراجع به صورت کاملا ماشینی و بر اساس هوش مصنوعی استخراج شده اند و لذا ممکن است دارای اشکالاتی باشند که به مرور زمان دقت استخراج این محتوا افزایش می یابد. مراجعی که مقالات مربوط به آنها در سیویلیکا نمایه شده و پیدا شده اند، به خود Paper لینک شده اند :