The paper presents the two-dimensional and dynamic (2DD) method of using infrared (IR) thermography for the visualization ofthe cooling efficiency ofa heated wall, as this method was applied in an experimental investigation. The 2DD method allows the outer surface temperature measured by the IR thermography device to be worked out relative to the bulk coolant-fluid temperature. In this way the 2DD method makes visible the qualitative and quantitative flow characteristics within the thin contact layer at the inner surface ofthe wall. This flow characteristics, and more specifically the pattern of stream lines (for the detection of dead zones) and the distribution of the temperature differences between the temperature on the window outer surface and the bulk temperature ofthe coolant, determine the cooling efficiency. Finally animated JR thermogram sequences could be generated, allowing the spatial and temporal behavior ofthe flow/cooling behind the wall to be observe (for example see internet page http://wwwl.psi.chlwww_gfajmlasq/projects/liquid/liquid.html). The study ofthe cooling ofthe proton beam entry window described in this paper is part ofthe development program of neutron spallation sources with liquid metal targets '. The basic idea of the experiments was to use the real interacting materials (mercury as liquid metal and steel as window's wall) and observe the cooling effects of the mercury flow on the heated wall ofthe hemispherical shell ofthe mockup window. Different geometrical configurations ofthe inner flow guide tubes ofthe flow and different pumping velocities were examined in view offinding the optimal cooling solution.
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