Experimental investigation of viscous drag reduction of superhydrophobic nano-coating in laminar and turbulent flows

Moaven, K ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. DOI: 10.1016/j.expthermflusci.2013.08.003
  3. Publisher: 2013
  4. Abstract:
  5. In this research, effects of superhydrophobic nano-coating on frictional drag force have been investigated. The result of this study could be considered to be used as a method in applications concerned with fuel consumption reduction, less CO2 emission and environmental problems as well as speed increase; while, its significance can also be of great use in marine applications. A rotating disc apparatus was used as the experimental set-up to compare the frictional drag force on an aluminum disc with TiO2 superhydrophobic nano-coating and a smooth coatless aluminum disc. The superhydrophobic nano-coating was prepared using sol-gel method and was shown to be able to produce a contact angle of about 160°. Experiments were performed in the Reynolds numbers, ranging from 105 to 2×106. Results indicated the drag reduction values of up to 30% and 15% in laminar and turbulent flows, respectively
  6. Keywords:
  7. Frictional drag reduction ; Nano-coating ; Rotating disc apparatus ; Superhydrophobic coating ; Environmental problems ; Experimental investigations ; Frictional drag ; Fuel consumption reduction ; Laminar and turbulent flow ; Nano-coatings ; Rotating disc ; Superhydrophobic coatings ; Aluminum ; Carbon dioxide ; Drag reduction ; Friction ; Hydrophobicity ; Marine applications ; Reynolds number ; Sol-gel process ; Turbulent flow ; Coatings
  8. Source: Experimental Thermal and Fluid Science ; Volume 51 , 2013 , Pages 239-243 ; 08941777 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0894177713001787