Abstract
A cold moderator using liquid hydrogen is one of the key components in a MW-scale spallation target system, which is cooled down by using a impinging jet flow. Flow visualization experi-ments with a simulated moderator vessel with cylindrical configuration were carried out in order to clarify flow patterns in the cold moderator vessel, which showed jet induced flows such as recirculation flows and stagnant regions. Analytical results of velocity distributions ob-tained with the standard k-s turbulent model agreed well with experimental results obtained under the bight and diameter ratio (h/D) of 2.0. However, analytical turbulent energy and heat transfer coefficients of a bottom of the vessel could not predict experimental values well.
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