Abstract
Exchange flows through breaches of a vacuum vessel (VV) in a fusion reactor under the Loss-of-Vacuum-Accident (LOVA) conditions were observed to obtain velocity distributions and clarify those flow patterns. The exchange flows were visualized by smoke and those images taken by a CCD camera were processed by the correlation method, and velocity distributions in the exchange flows were calculated.In addition, moving small particles conveyed from the inside of the VV to the outside by the exchange flows under the LOVA conditions were visualized by the laser holography method and each particle size were recognized from those image data, and particle size distributions were calculated.It was found that the present flow visualization techniques would be an useful procedure for quantitative evaluation of the exchange flow patterns and particle size distributions.
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