- Encyclopedia Entry
Wire-mesh sensors obtain distributions of fluid-dynamic parameters via the detection of the real, imaginary or complex impedance of the fluid. The impedance is used to detect the local presence of phases in a multiphase flow, most frequently in a gas–liquid two-phase flow, or the concentration of a tracer affecting the conductivity in mixing experiments. The classical, intrusive concept is based on grids of electrode wires that are span over the cross-section of the flow duct, whereas sensors with electrodes placed on the surface of the walls represent non-intrusive derivatives of wire-mesh sensors, which can be used for liquid film thickness measurements as well as for phase detection or mixing studies in narrow gaps. The use of the signal acquisition method of wire-mesh sensors allows furthermore the readout of large matrixes of thermoresistive elements. Design of the sensors for different applications and parameter ranges, their function, main concepts of signal processing, existing information on the measuring uncertainties as well as methods to derive secondary measuring quantities are explained. Numerous examples taken from own publications as well as from those of other authors illustrate the presented materia Show more
Thome, John R.
Book titleEncyclopedia of Two-Phase Heat Transfer and Flow IV : Modeling Methodologies, Boiling of CO₂, and Micro-Two-Phase Cooling. Special Two-Phase Flow and Boiling Topics
Pages / Article No.
PublisherWorld Scientific Publishing
Organisational unit03725 - Prasser, Horst-Michael / Prasser, Horst-Michael
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