A Non-Axisymmetric Pattern Selection Problem in Core-Annular Flow
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Core-annular flow of two fluids is examined at the onset of the azimuthal mode number ±1 non-axisymmetric instability. The patterns that emerge are traveling waves and standing waves. The former travel in the azimuthal direction as well as the axial direction and would be observed as corkscrew waves. The standing waves travel in the axial direction but not in the azimuthal direction and appear as snakes. Weakly nonlinear interactions are studied to see whether one of these waves will be stable to small amplitude perturbations. Sample situations for down-flow are discussed. The corkscrews tend to be preferred when the annulus is narrow, while snakes are more likely when the annulus is wide.
KeywordsReynolds Number Standing Wave Maximum Growth Rate Free Fall Pattern Selection
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