Abstract
In the fluid observation experiments using a molten metal which is an opaque low Prandtl number fluid, the internal flow pattern has to be estimated from the fluctuation pattern of the surface temperature. In order to obtain the internal flow pattern directly, the visualization technique using an ultrasonic wave has been developed. It is composed of the small array sensor for high temperature, the tracer particles and signal processing unit. The position of a tracer can be detected by small array transducer, and the internal flow pattern can be visualized from dynamic position change of the tracers. The possibility of this visualization technique has been made clear by estimating the signal to noise ratio using imitative experiment.
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