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An air core phenomenon observed from lavatory bowl draining in our daily lives has a very important scientific meaning because it is also observed from many industrial applications and related with a natural phenomenon such as tornado. Moreover since the air core affects the drain speed, it is deeply connected with a disaster such as flood from local heavy rain. Thus many studies preventing the air core from forming have been conducted and various types of vortex suppressor have been suggested. In this paper, the numerical simulation on air core phenomenon is introduced and a lot of simulating results such as cross-sectional flow field, air-core-formation time and so on are discussed in view of the reason of forming the air core. Simulations on various sized tanks and drain ports, and the initial rotating speed of cylinder wall have been conducted (total 56 cases). The container level heights firstly forming the air core were compared from each other case. From dimensional analyses, four non-dimensional parameters and the relating equation among them were determined.

PARAMETRIC STUDY ON AIR CORE PHENOMENA AT LIQUID DRAINING FROM CYLINDRICAL TANK