D225 火花トレーシングによるサブミリスケール気体混合過程の可視化(OS-8:伝熱計測)

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  • D225 Flow Visualization of Sub-Milli-Scale Gas Mixing Process by Spark Tracing

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The spark tracing which is measurement method that doesn't need particle tracer was used to obtain the time line images of gas mixing process in sub-milli-scale. The parameter changed in this research was the flow rate (Re = 65, 135) and temperature of gas (298, 318, 343[K]). This measurement can change the resolution time by changing the interval time of the added pulse voltage, and we archived it to 0.1ms. Firstly, the relationship of spark width and the velocity was searched for, and velocity was calibrated, we succeeded in measuring velocity by spark tracing. From visualization picture, it was shown clearly that flow velocity becomes high near channel exit and by high Reynolds number. Moreover, this measurement was possible to measure flow velocity without calibration even if the temperature of operation fluid changed.

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