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Investigation of Dropwise Condensation on Nanostructured Superhydrophobic Surfaces using Molecular Dynamics Simulation

Alborzi, Saeed | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50637 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Moosavi, Ali
  7. Abstract:
  8. Phase change processes have been used in heat transfer industries for decades. However, the heat transfer rate enhancement of the surfaces is still a challenging issue for the researchers. In this path, emerging nanostructured surfaces have shown great potentials. We demonstrate that using nanostructured surfaces in the condensation processes enhances the heat transfer behaviour of the fluid through interfacial contact area increase. In the present study molecular dynamics simulation have been employed to monitor the atomic behaviour of the system components at nanoscale. The argon liquid is considered as the working fluid and the copper surfaces as the phase change site. The effect of different nanostructures arrangement has been investigated by changing the number of pillars sitting on the condensation plate. As a result, increasing the contact area of the surface leads to faster energy transfer and lower temperature peaks. By plotting the number density distribution of argon atoms at different times of the simulation period, we obtain a better understanding of the system’s phase change process at the nanoscale. It is concluded that the size of nanostructures is not the larger the better, but the length of the grooves between them is also needed to be considered. Next, we raise the hot surface temperature in order to visualize the effect of explosive boiling on the process
  9. Keywords:
  10. Consolidation ; Molecular Dynamic Simulation ; Superhydrophobic Surfaces ; Dropwise Condensation ; Superhydrophobic Nanostructured Surfaces

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