Observation of Helium Two-Phase Flows in a Pipe

Oike, Mamoru and Tokumasu, Takashi and Kamijo, Kenjiro (2001) Observation of Helium Two-Phase Flows in a Pipe. In: CAV 2001: Fourth International Symposium on Cavitation, June 20-23, 2001, California Institute of Technology, Pasadena, CA USA.

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Abstract

Applications using cryogenic fluid generally encounter obstacles or complex pipe shapes such as an orifice or a converging-diverging nozzle. Therefore, a flow visualization study on two-phase cryogenic flow passing through a convergent-divergent nozzle or an orifice nozzle installed in a horizontal pipe is carried out to clarify the fundamental characteristics of the transient growth process of helium cloud cavitation. The pipe is filled with pressurized cryogenic liquid and flow immediately occurs when the on-off valve is opened. The transient growth process of the cloud cavitation induced by flow through the throat is observed from high-speed video images. Comparisons between the high-speed observations and the pressure measurements indicates that the transient growth process can be divided into two different steps by taking into account the transition point based on the observational results. Furthermore, it is confirmed that there are two types of the pressure instability in blowdown tests: one is the instability induced by density wave oscillation and the other is that induced by acoustic wave oscillation.

EPrint Type:	Conference or Workshop Item (Lecture)
Subjects:	All Records Session A8 Bubbly Flows / Cloud Cavitation
ID Code:	385
Deposited By:	Mamoru Oike
Deposited On:	01 June 2001
Record Number:	CAV2001:sessionA8.002
Official Persistent URL:	http://resolver.caltech.edu/CAV2001:sessionA8.002
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