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Fabrication and Investigation of Condensation Performance of Hybrid and Solid – Infused Surfaces

Rezaee, Behzad | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55284 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Mousavi, Ali; Aryanpour, Masood
  7. Abstract:
  8. Increasing energy consumption and limited energy resources are instances of the concerns of human societies and environmentalists today. The condensation process, as one of the most important processes in the industry, plays an important role in saving and regeneration the existing energy. Nowdays, surface optimization is one of the modern ways to improve condensation.In this research, two methods have been used to construct surfaces useful for enhancement of droplet condensation, including hybrid surfaces and solid infused surfaces. In the construction of hybrid surfaces, superhydrophobic coating with silica nanoparticles based on hydroxyl acrylic resin was used. The superhydrophilic parts with dimensions of 500 and 700 micrometers are made with a new and cheap technique. Also, in the construction of the solid infused surface, the anodizing process has been used to create holes with a diameter of 125 nm and a height of 10 micrometers.The coating applied on aluminum 6000 and hybrid surface has a contact angle of 156° in the superhydrophobic part and less than 5° in the superhydrophilic part. Hysteresis angle was less than 4°. Also, solid infused surfaces with two types of wax have contact angles of 107° and 104° and hysteresis contact angles of 4° and 7°. Examination of surface durability for 10 days in aqueous medium showed no change in contact angle in solid infused surfaces and a decrease of 8° in hybrid surfaces. Scanning electron microscopy images also showed that the wax does not drain after testing with water vapor. Condensation test was performed for a plate with dimensions of 75 × 120 cm2 in the condensation testing machine and the results showed that the condensation heat flux for natural wax improved 42% at a subcooling temperature of 16℃ and hybrid surfaces improved 21.5% at a subcooling temperature 21℃
  9. Keywords:
  10. Superhydrophobic Surfaces ; Consolidation ; Improved Heat Transfer Coefficient ; Solid Infused ; Hybrid Surfaces

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