0607 サブクールプール沸騰における伝熱面からの蒸気泡離脱挙動(S45-2 原子炉システムおよびその要素技術(2),S45 原子炉システムおよびその要素技術)

概要

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Vapor bubble behavior in subcooled pool boiling of distilled water was visualized using a high-speed camera. The applied heat flux was controlled to keep the bubble number density low enough to observe the behavior of individual bubbles. In the present experiments, bubbles were flattened along the heated surface when generated at the nucleation sites. The bubble size then increased gradually and the bubble shape became more rounded. It was considered that the variation of bubble shape was mainly induced by the surface tension force. When the bubble became nearly spherical, they were lifted-off from the heated surface and then collapsed in the subcooled bulk liquid. It was considered that the inertia of local liquid flow directing toward the bubble base was responsible to cause the bubble life-off from the heated surface. It was shown that the horizontal migration velocity and the bubble size at the life-off from the heated surface were correlated as the functions of the bubble size and the superheated layer thickness, respectively. It was also shown that the property of heated surface was influential in the vapor bubble behavior.
2007-09-07