Abstract
This paper presents a study to determine the effect of sensor dimensions (length, width, and thickness) on the performance of flexible hot film shear stress sensors. The sensing component of a hot film sensor is nickel thermistor, and the flexible substrate material is polyimide. Several groups of flexible hot film shear stress sensors with different lengths, widths, and thicknesses were studied. The temperature coefficient of resistance (TCR) was measured. The TCR increased slightly with increasing thickness. The frequency response (time constant) of the flexible hot film shear stress sensor was obtained by the square wave, while the sensitivity was tested in a wind tunnel. The study found that as the sensor length was shortened, the frequency response increased, and the sensitivity decreased.
Highlights
IntroductionWhen measuring measuringboundary boundarylayer layerinina wind a wind tunnel, wires have alwaysThewire hot tunnel, hothot wires have always beenbeen used.used.The hot wire is always a tungstenTheends two of ends the tungsten wire are welded on a support.is always a tungsten wire. wire.The two the of tungsten wire are welded on a support
The flexible hot film shear stress sensor was put in an incubator with wires connected to a where Px is the local pressure, in newton; h is the half height of the wind tunnel and x is the stream-wise multimeter outside
The conduction of electrons is affected by the scattering of the film surface, grain boundaries and defects
Summary
IntroductionWhen measuring measuringboundary boundarylayer layerinina wind a wind tunnel, wires have alwaysThewire hot tunnel, hothot wires have always beenbeen used.used.The hot wire is always a tungstenTheends two of ends the tungsten wire are welded on a support.is always a tungsten wire. wire.The two the of tungsten wire are welded on a support. When measuring measuringboundary boundarylayer layerinina wind a wind tunnel, wires have always. Thewire hot tunnel, hothot wires have always beenbeen used.used. The hot wire is always a tungsten. Theends two of ends the tungsten wire are welded on a support. The two the of tungsten wire are welded on a support. 1 shows shows the hot wire and flexible hot film installed on a flat plate. The hot wire and flexible hot film installed on a flat plate. The hot wire is easy to break because the tungsten wire is hung in the flow with just two ends to support it. Due to the limitation of the support, it cannot be very close to the wall, which means that it
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