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A device and method for measuring the effective slip length of a superhydrophobic surface

A super-hydrophobic surface and super-hydrophobic technology, applied in the field of fluid mechanics, can solve the problems of high operator requirements, insufficient precision, complex equipment, etc., and achieve the effect of simple measurement conditions and measurement operations, easy access, and reduced error sources

Active Publication Date: 2019-12-24
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0014] In view of the above defects or improvement needs of the prior art, the present invention provides a device and method for measuring the effective slip length of a superhydrophobic surface. Solve the technical problems of complex equipment, high requirements for operators and insufficient precision in the prior art

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  • A device and method for measuring the effective slip length of a superhydrophobic surface
  • A device and method for measuring the effective slip length of a superhydrophobic surface

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Embodiment Construction

[0044] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0045] The object of the present invention is to provide a more easily operable measurement means to measure the properties of an unknown super-hydrophobic surface by indirectly measuring the frequency of vortex shedding with the monotonic relationship between the slip length obtained by theoretical and direct numerical simulation and vortex shedding.

[0046] The fluid slip boundary conditio...

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Abstract

The invention relates to a device for measuring an effective slip length of a superhydrophobic surface. The device comprises a first motor, an impeller, a water tank and a vortex frequency measuring unit; the impeller is arranged in the water tank and fixed on the output shaft of the first motor for providing water circulation power. The water tank includes a replaceable test section; the vortex frequency measuring unit includes a second motor, a rotating cylinder, a vortex speedometer, and a processor; the output shaft of the second motor is coupled to the rotating cylinder, and the rotatingcylinder is located in the replaceable test section, and is used for rotation driven by the second motor to generate a vortex in the replaceable test section; the vortex speedometer is used to measurethe shedding speed of the vortex; the processor is used to solve the effective slip length according to the shedding speed of the vortex; the rotating cylinder is made of a superhydrophobic materialto be tested, or the surface of the rotating cylinder has a layer of the superhydrophobic material to be tested. The device has the advantages of less error sources, lower time cost, ability to measure a wider range of medias, relatively-simple requirements for measurement conditions and measurement operations, and the like.

Description

technical field [0001] The invention belongs to the field of fluid mechanics, and more specifically relates to a device and method for measuring the effective slip length of a superhydrophobic surface by applying fluid mechanics. Background technique [0002] In recent years, superhydrophobic surfaces have attracted more and more researchers' interest. The discovery of superhydrophobic surfaces was inspired by the surface of lotus leaves in nature. The droplets on the surface of the lotus leaf have a large contact angle and a small hysteresis angle. Further observation by a high-power electron microscope shows that the surface of the lotus leaf has a multi-level waxy microstructure. After heating to melt these microstructures, the surface of the lotus leaf loses its superhydrophobicity. Therefore, superhydrophobicity is composed of the hydrophobic surface and the rough microstructure on it. The rough microstructure on the superhydrophobic surface can be regular or irregul...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N13/00
CPCG01N13/00
Inventor 熊永亮任茜杨丹
Owner HUAZHONG UNIV OF SCI & TECH
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