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首页> 外文会议>American Society of Mechanical Engineers(ASME) Integrated Nanosystems Conference: Design, Synthesis, and Applications; 20050914-16; Berkeley,CA(US) >MEASUREMENT OF LIQUID SLIP ON NANOTURF SURFACES
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MEASUREMENT OF LIQUID SLIP ON NANOTURF SURFACES

机译：纳米纤维表面上的液体滑移测量

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摘要

While many new studies have confirmed the existence of liquid slip over certain solid surfaces, there has not been a deliberate effort to design and fabricate a surface that will maximize the slip effect and reduce drag in liquid flow in practical conditions. Hydrophobic rough surfaces have been studied experimentally to reduce the friction in liquid flow. The fine grooves, trapping air in them, were speculated to decrease the liquid-solid contact area and contribute to the drag reduction. However, the grooves constitute only a fraction of the entire surface and the rest of the surface is also rough, making it difficult to isolate and attribute the effect of the air layer. Although the post structures with large pitches (i.e., over several microns) may be convenient to fabricate and more convincing to demonstrate the drag reduction, they function only under small liquid pressure (e.g., < 5000 Pa), which does not represent most real flow conditions. Although the nano-patterned surfaces have recently been shown to reduce the friction even under high pressure, the amount of slip is not large enough to generate a meaningful drag reduction. Hence, our goal, extended from the previous report for droplet flows, is to engineer a surface that maximizes the slip effect for continuous flows in real engineering cases when the liquid is considerably pressurized.
机译：尽管许多新的研究证实了在某些固体表面上存在液滑，但并没有刻意设计和制造一种表面，该表面将在实际条件下最大化滑移效果并减少液体流动中的阻力。已经对疏水性粗糙表面进行了实验研究，以减少液体流动中的摩擦。据推测，细小凹槽中捕获了空气，以减少液固接触面积并有助于减小阻力。然而，凹槽仅构成整个表面的一部分，并且该表面的其余部分也是粗糙的，从而使得难以隔离并归因于空气层的作用。尽管具有大节距（即，超过几微米）的柱结构可能便于制造并且更令人信服以证明减阻效果，但它们仅在较小的液压（例如，<5000 Pa）下起作用，这并不代表大多数实际流量条件。尽管近来已经显示出纳米图案化的表面即使在高压下也能减小摩擦，但是滑动量不足以产生有意义的减阻。因此，我们的目标是从先前的液滴流量报告扩展而来，其目的是设计一种表面，该表面在实际工程案例中当液体受到相当大的压力时，能够使连续流动的滑移效应最大化。

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