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Influence of New Superhydrophobic Micro-structures on Delaying Ice Formation
Colloids and Surfaces A: Physicochemical and Engineering Aspects ( IF 5.2 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.colsurfa.2020.124675
Ramin Kamali Moghadam , Mohammad Taeibi Rahni , Khodayar Javadi , Salar Heyat Davoudian , Reinhard Miller

Abstract Drop motion on different types of new proposed micro-structure surfaces has been numerically investigated to find the optimum structure in view point of ice formation delaying. The droplet automatically moves on the inclined surfaces due to gravity forces. To validate the numerical algorithm, three different bench mark problems have been considered. The results indicate that the present algorithm is trustable for the presented numerical simulations. Then the validated numerical approach has been used to simulate droplet motion on nine proposed superhydrophobic surfaces in the same conditions. Comparison the drop motion on different micro-structure surfaces at different time indicate that creation of most micro-structure coating on smooth surfaces causes larger equilibrium contact angles and delays ice formation. For better understanding the results, the air flow structure trapped in the grooves have been plotted and investigated for some cases and the extracted results have been discussed in view of ice formation. It is found that the micro-structure in which the grooves’ upper surface is greater than the lower one, may cause worse hydrophobicity conditions than the smooth one. Also, adding hierarchical structures to the micro grooves creates better ice repellency conditions. Structures which prevent formation of secondary vortices, like circular grooves, are more preferable to other micro-structures in view point of ice formation.

中文翻译:

新型超疏水微结构对延迟冰形成的影响

摘要 已经对不同类型的新提出的微结构表面上的液滴运动进行了数值研究,以从结冰延迟的角度寻找最佳结构。由于重力,液滴在倾斜表面上自动移动。为了验证数值算法,已经考虑了三个不同的基准问题。结果表明,本算法对于所提出的数值模拟是可信的。然后,经过验证的数值方法已用于在相同条件下模拟九个提议的超疏水表面上的液滴运动。不同时间在不同微结构表面上的液滴运动的比较表明,在光滑表面上形成大多数微结构涂层会导致更大的平衡接触角并延迟冰的形成。为了更好地理解结果,在某些情况下绘制并研究了被困在凹槽中的气流结构,并根据冰的形成讨论了提取的结果。发现凹槽上表面大于下表面的微观结构可能导致比光滑表面更差的疏水条件。此外,在微凹槽中添加分层结构可产生更好的防冰条件。从结冰的角度来看,防止形成次级涡流的结构,如圆形凹槽,比其他微结构更可取。发现凹槽上表面大于下表面的微观结构可能导致比光滑表面更差的疏水条件。此外,在微凹槽中添加分层结构可产生更好的防冰条件。从结冰的角度来看,防止形成次级涡流的结构,如圆形凹槽,比其他微结构更可取。发现凹槽上表面大于下表面的微观结构可能导致比光滑表面更差的疏水条件。此外,在微凹槽中添加分层结构可产生更好的防冰条件。从结冰的角度来看,防止形成次级涡流的结构,如圆形凹槽,比其他微结构更可取。
更新日期:2020-06-01
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