Scaling of Gas Diffusion into Limited Partial Cavity and Interaction of Vertical Jet with Cross-flow beneath Horizontal Surface.

Scaling of Gas Diffusion into Limited Partial Cavity;Interaction of Vertical Jet with Cross-flow beneath Horizontal Surface;Multiphase flow;Naval Architecture and Marine Engineering;Engineering;Naval Architecture and Marine Engineering

Lee, In-ho R.Perlin, Marc ;

University of Michigan

关键词: Scaling of Gas Diffusion into Limited Partial Cavity;    Interaction of Vertical Jet with Cross-flow beneath Horizontal Surface;    Multiphase flow;    Naval Architecture and Marine Engineering;    Engineering;    Naval Architecture and Marine Engineering;   

Others  :  https://deepblue.lib.umich.edu/bitstream/handle/2027.42/113394/leeinho_1.pdf?sequence=1&isAllowed=y

瑞士|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

Scaling of Gas Diffusion into Limited Partial Cavity: Bubble populations in the wake of a partial cavity resulting from gas diffusion were measured to determine the non-condensable gas flux into the cavity. The diffusion rate is related to the dissolved gas content, the local cavity pressure, and the flow within and around the cavity. The measurements are used to revisit various scaling relationships for the gas diffusion, and it is found that traditional scaling that assume the presence of a gas pocket over-predict the gas diffusion. A new scaling based on diffusion into low void-fraction bubbly mixture within the partial cavity is proposed, and it is shown to adequately scale the observed production of gas bubbles.Interaction of Vertical Jet with Cross-flow beneath Horizontal Surface: Vertical gas jet injection into liquid cross-flow beneath horizontal surface was observed and the physics of it was studied. Previous studies on jet and cross-flow interactions showed that cross-flow speed, jet speed, and their momentum ratio are related to the resulting flow behavior. In the present study, it is found that overall topology of the resulting flow is completely different with previous studies by changing the direction of jet injection regarding gravity direction. Dimensions to describe new topology and scaling based on gravity acceleration and boundary layer thickness in addition to traditional parameters are proposed.