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Using the Engineered Surface to Reduce the Adhesion Force of Ice to the Surface and Increase the Freezing Time of Water on the Surface

Talebi Chavan, Reza | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55910 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Moosavi, Ali; Hosseini, Vahid
  7. Abstract:
  8. Ice formation upon various surfaces could lead to many industry problems and result in unpleasant accidents. For instance, the formation of ice on wind turbine blades or airplanes/helicopter wings could cause catastrophic disasters. The methods used to address this problem usually require exogenous energy consumption or anti-ice ingredients. The energy or anti-ice ingredients usage has adverse environmental effects and should be replaced with better approaches. One of these approaches is utilizing modified anti-ice surfaces. In this method, by modifying surface features, such as physical asperities and surface energy, the icing time of the surface could be prolonged. These surfaces are renowned as superhydrophobic surfaces and could postpone ice formation. Although these surfaces have many advantages, they lose their functionality at relatively high humidity. In contrast, porous surfaces filled with low surface energy oils not only possess the good characteristics of superhydrophobic surfaces, but also have better performance at high humidity. In the present study, we fabricated nanoscale holes upon aluminum 6061 using anodizing method, which were then infused with silicone oils. The ice adhesion test showed that the ice adhesion force on this surface is 15 kPa which is very low. Furthermore, the fabricated surface could delay the icing of the supercool droplet upon the surface at -20˚C by controlling the ice nucleation. Moreover, frost formation tests revealed that the fabricated surface could considerably delay the frost formation time for high humidities. This time could rise to 47 minutes for a 3×3 surface, whereas an ordinary aluminum sheet of the same size was frozen after 90 seconds
  9. Keywords:
  10. Frost ; Adhesion ; Anodizing ; Oil ; Porous Media ; Ice ; Superhydrophobic Surfaces

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