Author(s): Baldur Barczewski
Linked Author(s):
Keywords: No Keywords
Abstract: To improve turbulence models, normally used for calculations of turbulent mass transpor in flows, simultaneous velocity and concentration measurements are needed, Because available in-struments for measurements of concentration fluctuations are very complicated inaccurate and only partly suitable very few experimental data exist. Therefore a chopped in-situ-fluorometer has been developed which allows local tracer concentration measurements up to high fluctuation frequencies. Using the fluorometric principle very small tracer concentrations (< 0.1 ppb) can be measured with-out probes in the flow. The special requirements, using this method for direct measurements in flows using an Argon Laser as light source, concerning light choppers, electronical and optical set ups are investigated. The design of the instrument is described and applicability of the instruments to turbulent flow investigations is shown by some measurements of average concentrations and of concentration fluctuations in a axisymmetric buoyant jet.
Year: 1985