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Use of Engineered Surfaces to Increase Dropwise Condensation

Mahlouji Taheri, Mahmoud | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56991 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Moosavi, Ali
  7. Abstract:
  8. The limitation of energy resources and the increasing energy consumption has led researchers to look more closely at industrial processes such as condensation to improve these processes and prevent energy wastage. Increasing the efficiency of the condensation process will improve the performance of energy systems, save energy and protect the environment. In this research, various surfaces are fabricated, each of which in some way makes it possible to improve the condensation process. To perform the condensation test, the condensation surface, which is placed in the condensation test chamber, is cooled with a heat exchanger. Due to the high temperature of water vapor, many of the surfaces created were not durable enough to be used in these conditions. However, in this research, different surfaces were made and examined, and among these surfaces, the superhydrophobic surface modified with silane compounds showed the best performance. Due to its efficient droplet, this surface not only has the ability to improve the condensation heat transfer coefficient up to 676.7%, but also it can maintain its optimal performance for long hours (more than 200 hours). This surface also has an excellent durability against mechanical abrasion and corrosion, so that after 10 meters of wear with #1000 sandpaper, it can maintain its superhydrophobicity. In addition, in order to investigate the durability of the surface against corrosion, a polarization test has been performed. In this test, the corrosion current is obtained from the tafel diagram, and the lower it is, the more resistant the sample is to corrosion. Accordingly, the corrosion current of superhydrophobic surface is four orders lower than the corrosion current of the bare aluminum surface. In addition, the results of this research indicate that the superhydrophilic surface can increase the heat transfer coefficient by 16.15%, as well
  9. Keywords:
  10. Heat Transfer Coefficient ; Superhydrophobic Surfaces ; Superhydrophilic Surface ; Nanotechnology ; Dropwise Condensation ; Improved Heat Transfer Coefficient ; Droplet Condensation Improvement ; Solid/Liquid Infused Surfaces ; Surface Engineering

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