Department of Mechanical & Nuclear Engineering, Virginia Commonwealth University, Richmond, Virginia 23284-3015, United States.
Langmuir. 2012 Jun 26;28(25):9759-66. doi: 10.1021/la301299e. Epub 2012 Jun 8.
Previous studies have demonstrated the capability of superhydrophobic surfaces to produce slip flow and drag reduction, which properties hold considerable promise for a broad range of applications. However, in order to implement such surfaces for practical utilizations, environmental factors such as water movement over the surface must be observed and understood. In this work, experiments were carried out to present a proof-of-concept study on the impact of flow on longevity of polystyrene fibrous coatings. The time-dependent hydrophobicity of a submerged coating in a pressure vessel was determined while exposing the coating to a rudimentary wall-jet flow. Rheological studies were also performed to determine the effect of the flow on drag reduction. The results show that the longevity of the surface deteriorates by increasing the flow rate. The flow appears to enhance the dissolution of air into water, which leads to a loss of drag reduction.
先前的研究已经证明了超疏水表面产生滑移流和减阻的能力，这些特性在广泛的应用中具有很大的潜力。然而，为了将这种表面实际应用，必须观察和理解水在表面上的流动等环境因素。在这项工作中，进行了实验，以展示对聚苯乙烯纤维涂层的流动对其耐久性影响的概念验证研究。在将涂层暴露于基本壁射流的同时，在压力容器中确定了浸入涂层的随时间变化的疏水性。还进行了流变学研究以确定流动对减阻的影响。结果表明，随着流速的增加，表面的耐久性会降低。流动似乎会增强空气向水中的溶解，从而导致减阻的损失。
