Abstract
Measurement of Lead Bismuth Eutectic (LBE) flow velocity profile was successfully realized in the spallation target model loop of Accelerator Driven System (ADS) by the Ultrasonic Velocity Profiler (UVP) technique. UVP is a powerful tool to measure an instantaneous space-time velocity profile especially on a velocity measurement of an opaque liquid flow, such as liquid metal. However, it has not yet been done well because both of its poor wetting property with stainless steel and of the difficulty in manufacturing probe at high temperature. We performed velocity measurement along the centerline of the ioop and confirmed basic performance of the loop. It was found that there were periodical releases of eddy from the re-circulation region formed near the wall surface of the inner cylinder. We made then a measurement for non-parallel directions with the centerline and observed 3-dimensional structure of LBE flow configuration.
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