The basic principle of the anemometer is to put a thin wire in the fluid, and pass the current to heat the wire to make the temperature higher than the temperature of the fluid, so the wire anemometer is called "hot wire". When the fluid flows through the wire in the vertical direction, it will take away part of the heat of the wire, causing the temperature of the wire to drop.
The purpose of the anemometer:
1. Measure the speed and direction of the mean flow.
2. Measure the pulsation speed and spectrum of the incoming flow.
3. Measure the Reynolds stress in turbulent flow and the velocity dependence and time dependence of two points.
4. Measure the wall shear stress (usually using a hot film probe placed flush with the wall, the principle is similar to the hot wire speed measurement).
5. Measure the fluid temperature (the curve of the probe resistance with the fluid temperature is measured in advance, and then the temperature can be determined according to the measured probe resistance.
Article link: Instrument Equipment Network https://www.instrumentsinfo.
