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Effect of Superhydrophobic Materials Application on the Car Body to Reduce Drag

Valizadeh, Mahsa | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50026 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Moosavi, Ali; Khodaygan, Saeed
  7. Abstract:
  8. Considering the importance of environmental issues and the limitation of fuel supplies in the world, car issues have become one of the most important debates of the day. The methods used to reduce fuel consumption and emissions of greenhouse gases are primarily aimed at changing vehicle structure to reduce drag. An external body shape has been developed to reduce drag forces over the years. Due to the existence of limitations in the actual conditions of the theory, such as the beauty and convenience production, other methods should be examined. In this study, the structure of superhydrophobic properties materials with the emphasis on innovation has been considered. In order to investigate the effect of the structure of these materials and turning to the structure of shark skin, vortex generator as a candidate for superhydrophobic structure is considered. Therefore, for accurate studying of design parameters effect different dimensions of vortex generators are considered. The aspect ratios of 0.02, 0.03, and 0.04, rotation angles of the vortex generator from 5 to 30 degrees and the distance between 4, 5 and 6 millimeters are considered. Also, the selected car model was Ahmed Body with 35 degree angle, which with fluent software flow structure has been investigated. The results are confirming effect of vortex generators on reducing drag and using these structures, the drag coefficient decreased by a maximum of 2%. By changing the dimensions, it is observed at most angles and distances between vortex generator, drag coefficient is minimum in ratio of 0.03. Also, with increase in the number of generators, the drag coefficient also increases, which can be related to the effective area exposed to the flow. By reducing the distance from the rear of car, the drag coefficient is increased, which is because of separation occurrence at closer distances
  9. Keywords:
  10. Fluent Software ; Drag Reduction ; Vortex Generator ; Automobiles ; Emission Reduction ; Hydrophobic Materical

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