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Ikoma, Yusuke*; Koizumi, Yasuo*; Ito, Kei; Ohshima, Hiroyuki
Proceedings of 19th International Conference on Nuclear Engineering (ICONE-19) (CD-ROM), 8 Pages, 2011/10
A gas entrainment rate into liquid by a vortex formed on the free surface was examined experimentally. When the flow velocity was low, a single bubble was periodically torn off from the bottom tip of the vortex and the bubble-type gas entrainment was observed. An increase in the flow velocity resulted in the transition from the bubble-type gas entrainment to the vortex-type gas entrainment and the gas entrainment rate considerably increased with the flow velocity. After the vortex tip penetrated into the outlet pipe, the rotation speed of the vortex decayed. As a result of it, the Kelvin-Helmholtz instability wave length got long and the size of the generated bubble became large. Then, the outlet pipe was filled with the large bubbles and the flow state in the outlet pipe turned to the slug/churn flow and a large amount of gas began to be carried out form the test vessel.
Ikoma, Yusuke*; Koizumi, Yasuo*; Ito, Kei; Ohshima, Hiroyuki
no journal, ,
The gas entrainment (GE) phenomena has been studied in a relatively simple experiment. In the study, the occurrence behaviors of the GE are investigated and the mechanism of the GE is discussed. This 3rd report shows the measurement results of entrained flow rates under bubble-type GE conditions.
Ikoma, Yusuke*; Koizumi, Yasuo*; Ito, Kei; Ohshima, Hiroyuki
no journal, ,
Gas entrainment is examined in a relatively simple container to observe the occurrence behavior and to consider the occurrence mechanism. In addition, the entrained gas flow rate is measured. In this report, bubble-type entrainment is investigated closely and the diameter distribution of the entrained bubbles is obtained.