Title
ThreeDimensional Velocity and Vorticity Measuring and Image Analysis Techniques: Lecture Notes from the Short Course held in Zr,Used
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The contents of this volume reflect to a large extent the efforts made by a group of Institutes at the ETH Zrich to develop new techniques for measurements of flows in fluids in the last decade. The motivation came from the study of tr~sport and mixing processes in natural and industrial systems. One of the characteristic properties of turbulence is its high mixing efficiency. The techniques developed are therefore suitable, although not exclusively, for turbulence measurements. They can be subdivided into pointmeasurements and fieldmeasurements. The aim of the pointmeasurements developed is to determine the three components of the velocity and all their first derivatives with good temporal resolution and accuracy in turbulent flows. The old and weIl established method of hotwire anemometry was used for this purpose. One of the main achievements in this context is the construction of miniature multiwire probes. This technique was introduced to the Institute of Hydromechanics and Water Resources Management of ETH Zrich by Profs. A. Tsinober and E. Kit from TelAviv University. This was made possible by the generous financial support by ETH, for which I would like to express my gratitude on this occasion. In addition, Dr. F.E. Joergensen from DANTEC contributed an example of recent developments in the hardware ofConstant Temperature Anemometry (CTA), for which I am very thankful.
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