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Effect of wettability on bubble formation at gas nozzle under stagnant condition

Kogawa, Hiroyuki  ; Shobu, Takahisa  ; Futakawa, Masatoshi  ; Ahmed, B.*; Haga, Katsuhiro  ; Naoe, Takashi*   

It is important to understand the bubble formation behavior from the viewpoint of development on the micro bubble injection method into mercury to mitigate pressure waves in mercury target for spallation neutron source. Observation of bubble formation was carried out by using the high intense X-ray from SPring-8. A thin nozzle of 100 $$mu$$m in inner diameter and 200 $$mu$$m in outer diameter was installed into the bottom of vessel filled with mercury. Helium gas was injected to mercury through the nozzle. Bubble formation behavior in mercury was compared with that in water. Bubble formation behavior in mercury was quite different from that in water; though the bubble grew contacting the inside of the nozzle in water, it grew surrounding the outside of the nozzle in mercury. It seems that the wettability between the liquid and material of the nozzle causes the difference of bubble formation. This paper will discuss about the wettability effect on the bubble generation.

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Category:Materials Science, Multidisciplinary

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