Near-field behavior of variable property jet with swirling flow generated by a change in gravitational orientation
作者： Ahmad Adzlan , Shunsuke Tsutsumi , Hiroshi Gotoda
DOI: 10.1063/1.4906372
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摘要: This paper presents the near-field behavior of a variable property jet with swirling flow generated by change in gravitational orientation, focusing on onset vortex formation at interface and subsequent breakdown (VB). Two types gases are used to create significant difference physical properties between inner outer fluids: CO2 high-density low-viscosity, helium low-density high-viscosity. We propose nondimensional instability parameter M∗ as useful index for predicting interface. Inverted gravity (+1g) enlarges region unstable VB compared that normal (−1g), which clearly shows buoyancy force has impact VB. The trends changes half-angle stagnation point height investigated detail preceding stable Our model derived considering momentum balance fl...
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