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Transit time flowmeter using flow-induced noise in Sodium(I); Preliminary test for 3B PM flowmeter

not registered; not registered; not registered; Nakasuji, Takashi

A preliminary test was carried out in sodium, to confirm the principle of a transit time flowmeter employing cross-correlation technique of flow-induced noise. The tested permanent magnetic flowmeter (81.1mm I.D) has five pairs of electrodes arranged at equal distances along the flow direction. The transit time between electrodes was measured under conditions, and was transformed into a transit velocity using distance between electrodes (L)/transit time ($$tau$$$$^{*}$$): [Sodium temperature : $$sim$$500$$^{circ}$$C] [Average flow velocity : 0$$sim$$4 m/s] [Distance between electrodes : 4, 8, 12 ㎝] Conclusions are as follows : (1)The characteristic of transit velocity vs reference velocity was livear up to 4m/s except L=4㎝. (2)In case of L=12㎝, the obtained transit velocity agreed with a reference velocity within the accuracy of a reference flowmeter, but there was disagreements in both velocities in other cases. (3)It was clarified that power spectrum of fluctuation signal of PM flowmeter has relatively low frequency range ($$<$$ 10Hz), and that the break frequency and spectral density become higher and greater respectively as increase of flow velocity. (4)The non-linearity of transit velocity when L=4cm and $$upsilon$$ $$>$$ 3m/s, should be further investigated from both viewpoints of flow characteristics itself and instrumentation technique.

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