Surface friction force measurement device based on graphene and using method of surface friction force measurement device
A measuring device and friction force technology, applied in measuring devices, force/torque/work measuring instruments, instruments, etc., can solve problems such as difficult measurement, easy damage, and difficult production, and achieve simple and accurate formulas and algorithms, and stable and reliable structures , the effect of a wide range of measurement
Inactive Publication Date: 2015-01-14
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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[0003] The methods for measuring surface friction stress usually include: Preston tube, Stanton tube, bottom partition, hot wire, hot film, laser Doppler method, surface oil film, etc.; Preston tube, Stanton tube and bottom partition are indirect differential pressure measurement method, Dynamic measurement cannot be realized; hot film can realize dynamic measurement, but it is difficult to realize the measurement of friction direction; hot wire method can realize friction direction measurement, but it is difficult to manufacture and easy to be damaged; laser Doppler is only a single-point friction measurement, and Very expensive; the advantage of the surface oil film method is that it can realize global friction measurement, but the magnitude error of absolute friction will be large, and dynamic friction measurement cannot be realized
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[0026] Such as figure 1 and figure 2 As shown, the graphene-based surface friction measuring device of the present invention includes a base 1, a truncated conical measuring body 2, a graphene sheet 3 and a copper foil electrode 4; the truncated conical measuring body 2 is fixed on the base 1 On the side of the frustum-shaped measuring body 2, four graphene sheets 3 of equal area are evenly distributed, and the copper foil electrodes 4 are arranged corresponding to the edges of the arcs on both sides of each graphene sheet 3.
[0027] The use of the present invention comprises the following steps:
[0028] 1) Place the surface friction measurement device in the friction calibration system, and when the friction force and angle of the incoming flow are known, let the incoming flow flow through the device to generate blunt body flow, and calibrate the friction coefficient C and angle factor K q ;Specifically:
[0029] 1.1) Measure the voltage U between the electrodes at bot...
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The invention discloses a surface friction force measurement device based on graphene and a using method of the surface friction force measurement device. A circular-truncated-cone-shaped measurement body of the device is fixed on a base, a plurality of graphene sheet layers in same areas are evenly distributed on a lateral face of the circular-truncated-cone-shaped measurement body, and copper foil electrodes are arranged corresponding to edges of arc lines on two sides of each graphene sheet layer. The using method comprises the following steps of inducing to produce voltage at two ends of a graphene material when fluid flows through the grapheme, and enabling the induced voltage and fluid wall surface friction force to form a linear relation. Size and directions of the fluid wall surface friction force are measured according to size of the induced voltage. The surface friction force measurement device is simple in structure, free of movable components, good in reliability, rapid in response due to the fact that measurement signals are electrical signals and capable of conducting dynamic friction force measurement. In addition, the measurement device can be distributed in an array to achieve measurement of an overall surface friction force field.
Description
technical field [0001] The invention relates to the field of fluid flow measurement, in particular to a graphene-based surface friction measurement device and a measurement method thereof, which can solve the problem of fluid wall friction measurement in special and complicated occasions. Background technique [0002] Surface friction stress measurement is both an important application problem and a basic research problem. It can be used not only to improve the performance of transportation vehicles but also to describe the characteristics of the surface flow of objects in the flow field. [0003] The methods for measuring surface friction stress usually include: Preston tube, Stanton tube, bottom partition, hot wire, hot film, laser Doppler method, surface oil film, etc.; Preston tube, Stanton tube and bottom partition are indirect differential pressure measurement method, Dynamic measurement cannot be realized; hot film can realize dynamic measurement, but it is difficult ...
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IPC IPC(8): G01L5/00
Inventor 白亚磊
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS