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• W3100774622 abstract "Linear stability of stratified two-phase flows in horizontal channels to arbitrary wavenumber disturbances is studied. The problem is reduced to Orr-Sommerfeld equations for the stream function disturbances, defined in each sublayer and coupled via boundary conditions that account also for possible interface deformation and capillary forces. Applying the Chebyshev collocation method, the equations and interface boundary conditions are reduced to the generalized eigenvalue problems solved by standard means of numerical linear algebra for the entire spectrum of eigenvalues and the associated eigenvectors. Some additional conclusions concerning the instability nature are derived from the most unstable perturbation patterns. The results are summarized in the form of stability maps showing the operational conditions at which a stratified-smooth flow pattern is stable. It is found that for gas-liquid and liquid-liquid systems the stratified flow with a smooth interface is stable only in confined zone of relatively low flow rates, which is in agreement with experiments, but is not predicted by long-wave analysis. Depending on the flow conditions, the critical perturbations can originate mainly at the interface (so-called interfacial modes of instability) or in the bulk of one of the phases (i.e., shear modes). The present analysis revealed that there is no definite correlation between the type of instability and the perturbation wavelength." @default.
• W3100774622 created "2020-11-23" @default.
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• W3100774622 date "2016-04-01" @default.
• W3100774622 modified "2023-10-06" @default.
• W3100774622 title "Stability of stratified two-phase flows in horizontal channels" @default.
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• W3100774622 doi "https://doi.org/10.1063/1.4944588" @default.
• W3100774622 hasPublicationYear "2016" @default.
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