Device and method for testing drag reduction performance of super-hydrophobic surface

Abstract

The invention provides a device and method for testing the drag reduction performance of a super-hydrophobic surface and belongs to the technical field of surface drag reduction performance testing. The problems that existing super-hydrophobic surface drag reduction performance test is low in accuracy, limited in use, high in cost, complex in test process and poor in temperature characteristic aresolved. The device of the invention comprises a water tank, a test flow channel mechanism, a frictional resistance detection mechanism and a data processing mechanism, wherein the test flow channel mechanism is formed by sequentially connecting a water tank outlet, a water pump, a throttle valve, a flow meter and a spray pipe through a water flow pipeline; the frictional resistance detection mechanism comprises an elastic unit, a lever, a hinge and a displacement sensor; and the displacement sensor is in communication connection with the data processing mechanism. The device and method are mainly used for testing the drag reduction performance of the super-hydrophobic surface.

Description

Technical field [0001] The invention belongs to the technical field of surface drag reduction performance testing, and particularly relates to a testing device and a testing method for super-hydrophobic surface drag reduction performance. Background technique [0002] The surface of superhydrophobic materials has excellent properties such as self-cleaning, anti-icing, anti-corrosion and drag reduction, so it is widely used in the defense industry, aerospace industry, energy industry, communications and information technology, and medical technology. The main reason for the super-hydrophobic surface's drag reduction performance is that the air contained in its rough structure leads to the existence of the air-liquid interface in the wetting system, which reduces the contact area between the fluid and the surface, and reduces the viscous effect of the solid surface on the fluid. The drag reduction performance of the superhydrophobic surface can improve the dynamic performance of mi...

AI Technical Summary

Problems solved by technology

PIV particle image testing technology and Doppler frequency shift technology can intuitively display the flow velocity distribution in the micro-scale flow field, and provide effective observation and characterization means for explaining the drag reduction mechanism of super-hydrophobic surfaces. However, the higher cost and The complicated testing process limits its promotion and application at the present stage

The strain force measurement method can directly express the resistance of the superhydrophobic surface in the flow field, and the cost is low. However, the inherent defect of this method is that its temperature characteristics are poor, and an external temperature compensation circuit is required, which affects the accuracy of the measurement results. Influence

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