Abstract
The use of heavy liquid metals (HLM) serving both as coolant and as spallation source facilitates simple beam window geometries. An adequate cooling of the beam window requires a conditioning of the flow. Within the MEGAPIE window this is realized in a cylindrically shaped geometry, in which the main flow is guided in an annular gap downwards and then u-turned close to a hemispherical shell into a riser tube. In order to avoid stagnating fluid domains leading to unacceptably high window temperatures a jet flow is injected in direction of the lower shell. In this study the turbulent mixing of hot jet into a cold main flow is investigated both experimentally and numerically for the MEGAPIE geometry on a 1:1 scale. The experiments have been conducted in the Karlsruhe Lead Laboratory (KALLA). In parallel a numerical simulation has been performed. Close to the technically most interesting positions in the lower shell, a reasonably good agreement between numerical and experimental data has been found. Here, a sufficient description of the turbulent heat transfer in a lead–bismuth flow was obtained. However, as the flow proceeds downstream not only qualitative but quantitative differences appear, which have to be analyzed in more detail in the future.
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