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Experimental Investigation of Drag Reduction Induced by Superhydrophobic Surface

Taghvaei, Ehsan | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46982 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Moosavi, Ali; Nouri Borujerdi, Ali
  7. Abstract:
  8. The increasing demand of energy and energy consumption, urged researchers of different fields of science to investigate different aspects of energy efficiency methods. One way of optimization of energy consumption is to reduce drag force in moving objects in fluids. Changing the geometry of objects, bubble injection, air suction and blowing on surface, using nano fluid and superhydrophobic surface are just a number of drag reduction methods. Among the mentioned methods, using superhydrophobic surface due to its simplicity, low cost and no need to change in geometry of vehicles attracted attentions of researchers of all over the world. These surfaces with micro/nano roughness combined with hydrophobic coating which repels water, cause water to have the minimum contact area with solid surface. In addition, the trapped air between the roughness and water would lead to less shear stress than in usual case in which the water would touch the solid surface. Hence, the surface will experience lower surface friction or drag. In this report the appropriate superhydrophobic surface will be introduced by fabricating of different surfaces and investigating of different surface morphologies and properties. Finally, the results which consist of velocities, drag coefficients and resulting drag reduction compared with ordinary surface will be presented
  9. Keywords:
  10. Superhydrophobic Surfaces ; Drag Reduction ; Energy Optimization ; Micro/Nano Particle

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