Refractive Index Matched Tunnel Germany
Friedrich-Alexander-Universität Erlangen-Nürnberg
Erlangen, Germany

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The Institute of Fluid Mechanics at FAU Erlangen-Nuernberg possesses a novel test facility which enables various measurements that were previously impossible. The special feature of the new test facility is the use of cosmetic white oil as the working fluid, which has an optical refractive index identical to that of quartz glass. This prevents refraction at the surface of any quartz object inserted into the flow. As a result, investigations of the flow in the immediate vicinity of the surface of complex objects by optical measurement techniques become feasible.