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Enhancing Dropwise Condensation Through Surface Engineering Methods

Kia, Ahmad Reza | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57355 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Moosavi, Ali
  7. Abstract:
  8. Liquid-infused surfaces (LISs) reveal promising performance in improving condensation due to their ability to create a surface with a low contact angle (CA) that is suitable for nucleation rate, and low contact angle hysteresis (CAH), which allows for easy shedding. However, these surfaces have been limited in practical application due to issues with durability and scalability. Additionally, creating durable surfaces has been expensive and poses risks due to using specific chemicals. In this study, aluminum samples covered with silicone oils of various viscosities and decamethylcyclopentasiloxane (D5) are exposed to ultraviolet (UV) light to produce a durable and low-cost 1-D LIS that does not contain any hazardous materials. The effects of short-term and long-term exposure time are considered. For the short-time exposure, 10 hours of radiation is utilized, whereas the long-term exposure depends on the gelation time of the utilized lubricant, which are 15, 24, and 48 hours for silicone oils with a viscosity of 5 cSt, with a viscosity of 50 cSt, and D5. Tests reveal that all lubricants are chemically attached to the substrate, possessing a CA of greater than 100°, and CAH lower than 10°. Furthermore, the fabricated samples can reduce the corrosion current density by up to two orders of magnitude with respect to bare aluminum. The condensation test reveals that the surface, covered with 5 cSt silicone oil that is exposed to UV light for 10 hours, enhances the condensed water by 29.3%, 37.7%, and 38.9% at subcooling temperatures of 14.5 ℃, 10 ℃, and 5.5 ℃ with respect to bare aluminum, respectively. Additionally, the durability of the fabricated LIS is better than that reported in the literature
  9. Keywords:
  10. Dropwise Condensation ; Liquid-Infused Surfaces ; Surface Engineering ; Wettability ; Anticorrosive Coating

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