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Superhydrophobic surfaces with a dual-layer micro- and nanoparticle coating for drag reduction

Taghvaei, E ; Sharif University of Technology | 2017

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  1. Type of Document: Article
  2. DOI: 10.1016/j.energy.2017.02.117
  3. Publisher: Elsevier Ltd , 2017
  4. Abstract:
  5. We propose a facile and cost effective method for fabricating superhydrophobic surfaces with significant drag reduction in a wide velocity range. A dual structure superhydrophobic aluminum surface with a hydrophobic Al2O3micro- and nanoparticle coating and also another superhydrophobic surface with a nanoparticle layer coating are fabricated. Then, the resulted drag from each of these surfaces is measured carefully in different velocities and compared with the drag of the as-received aluminum surface. Our results reveal that the surface with the dual structure experiences drag reduction in a wider velocity range compared with the nanoparticle coated sample. Drag reduction of the dual structure substrate is between 77 and 5% for Reynolds number of 4.7 × 104and 2.35 × 105, respectively. The fabricated dual structure also shows a good durability which makes it favorable for many applications. © 2017 Elsevier Ltd
  6. Keywords:
  7. Drag reduction ; Micro- and nanoparticle ; Superhydrophobic ; Aluminum ; Aluminum coatings ; Coatings ; Cost effectiveness ; Drag ; Nanoparticles ; Reynolds number ; Surface properties ; Aluminum surface ; Cost-effective methods ; Good durability ; Hierarchical ; Nanoparticle layers ; Super-hydrophobic surfaces ; Hydrophobicity ; Aluminum ; Chemical compound ; Coating ; Nanoparticle ; Reduction ; Velocity profile
  8. Source: Energy ; Volume 125 , 2017 , Pages 1-10 ; 03605442 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0360544217302992