National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Holographic interferometry as a tool for visualization of temperature fields in fluids
Dančová, Petra ; Vít, Tomáš ; Lédl, V. ; Trávníček, Zdeněk ; Doleček, R.
Measurement of temperature field in moving fluids is connected with many difficulties. Usage of point temperature measurement methods, such as Constant Current Anemometry (CCA), is limited to frequencies up to 3kHz. This frequency should be the limiting factor for using the CCA in fluid when fast change of temperature occurs. This shortcoming of CCA measurements should be overcome by using of optical methods such as digital holographic interferometry. It is necessary to employ a special holographic setup with double sensitivity instead of the commonly used Mach-Zehnder type of holographic interferometer in order to attain the parameters sufficient for the studied case. This setup is not light efficient like the Mach-Zehnder type but has double sensitivity. The special technique of acquiring and phase averaging of results from holographic interferometry is presented.
Mean structure of the flow over backward facing step in a narrow channel
Uruba, Václav
Flow structure behind the backward facing step in a narrow channel was studied in details. The step height was 25 % of the channel width. The structure of the region just behind the step forming the back-flow region was subjected to experimental investigation using stereo PIV technique. Time-mean 3D structures behind the step are evaluated and shown in the paper.

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