Collection: flow

Flow measurement technology is used in research and development, where flow processes need to be investigated or optimized. Flow measurement technology is also an essential component for process control in industrial plants in the chemical or energy industries. Reliable information about the properties of turbulent flows can only be obtained through flow measurement technology.

Of particular interest are the fundamental variables of velocity, pressure, and temperature. Measurements can be taken using measuring probes inserted into the flow. Pitot tubes measure the total pressure in the fluid, from which the velocity can be indirectly determined. Thermal anemometry is another indirect velocity measurement method. The disadvantage of these indirect measurement methods is that the measurement signal depends not only on the velocity but also on other state variables, which must therefore be known.

Techniques such as particle image velocimetry and laser Doppler anemometry (see image) allow direct and local velocity measurements without probes. Particularly in aeroacoustics, it is not the average values ​​that are of interest, but rather the fluctuation values ​​of pressure, particularly the spectral power density, which is obtained through further signal processing.