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CFD VALIDATION OF FILM FLOWS BY NOVEL HIGH-SPEED LIQUID FILM SENSOR WITH HIGH SPATIAL RESOLUTION

A sensor is presented that allows high-speed measurements of two-phase film flows. The sensor consists of electrodes flush to the wall that measure the electrical conductance in the liquid film. This novel sensor has a time resolution of 10 kHz and 64x16 measuring points with a spatial resolution of 3.12 mm and a maximum film thickness range of 0.8 mm. The shape of the sensor electrodes is optimized by calculating the potential field of the liquid film. Dynamic measurements of co-current air-water flow in a horizontal channel with an obstacle have been conducted. The high time and spatial resolution allows a wave analysis over a wide range of wavelengths and wave velocities. Statistical analysis methods are presented to characterize the flow pattern e.g. for comparison with CFD simulations.