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Numerical Investigation of Flow on Superhydrophobic Surfaces by Lattice Boltzmann Method

Daeian, Mohammad Ali | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46185 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Moosavi, Ali; Nouri Borujerdi, Ali
  7. Abstract:
  8. Superhydrophobic surfaces have attracted so mucha attenetions in recent years. High contact angle, Low adhesion and low friction drag are the most important features of these surfaces. Two main parameters of these surfaces are hydrophobicity and micro-( or nano) scale roughness. In this Project a 2-D simulation of flow on superhydrophobic surfaces have been considered. Shan-Chen multiphase Lattice Boltzmann Model has been used for the simulation and carnahan-starling equation of state have been used or a higher density ratio. In the first step flow in a channel with smooth walls with different hydrophobicity have been simulated and effects of hydrophobicity on pressure drop have been investigated. In the second step structured grooves have been considered in the surfaces of channel. Three different pitch for grooves repeatition and four different groove size have been considered for each pitch. The results shows that the pressure drop can be reduced up to 20 percent by making the grooves. The results also shows that increasing the inlet pressure will cause in a lower pressure reduction. In the final step the effect of grooves depth have been investigated by con sidering seven different depth for grooves
  9. Keywords:
  10. Shan and Chen Model ; Lattice Boltzmann Method ; Drag Reduction ; Superhydrophobic Surfaces

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