Description of the Interferograms
In Figs. 4.11 and 4.12 the interferograms of channels with different corner
radii for laminar (Re = 500) and low turbulent flow (Re 2 2500) are shown.
The wall temperature was uniform 50°C for all measurements, whereas the
air inlet temperature at the inlet was equal to the ambient temperature (200C
to 21°C). The temperature difference between two neighbouring isotherms is
2.3 K, approximately. The evaluation of the interferograms was carried out