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Report No.

Velocity and temperature measurements of water flow in a wire-wrapped rod bundle system using temperature sensitive particles

Someya, Satoshi*; Ochi, Daisuke*; Ohshima, Hiroyuki; Okamoto, Koji*

Temperature sensitive particles incorporating phosphor molecules were synthesized. These particles, suitable for particle image velocimetry, were used to measure the velocity and temperature distributions in water flowing through a wire-wrapped rod bundle system, which simulated the fuel rod system in a fast breeder reactor. The particles were illuminated by a pulse laser at 20 Hz. A high speed camera was used to record 30 particle images at intervals of 25$$sim$$50 micro seconds (20$$sim$$40 kHz) for each excitation laser pulse. From each series of images the velocity and temperature fields were calculated. This measurement technique should contribute to the experimental validation of numerical simulations for the safe design of fast breeder reactors.



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