Wave length effect on Kelvin-Helmholtz instability criterion in two-phase stratified flow

	Wave length effect on Kelvin-Helmholtz instability criterion in two-phase stratified flow
Iranian Journal of Science and Technology Transactions of Mechanical Engineering
شناسنامه علمی شماره، دوره 24، شماره 3، اردیبهشت 2000، صفحه 259-267
شناسه دیجیتال (DOI): 10.22099/ijstm.2013.1009
چکیده
Transient conditions of two-phase air-water flow were numerically analyzed. The wave growth from a stratified flow regime in a horizontal duct was considered. Conservation equations were solved by finite difference method. The analyses on the onset of wave initiation was compared with the empirical correlations of other researchers. This analysis clarified that the Kelvin-Helmholtz instability criterion is valid only for waves with long wavelengths. Also, the required air velocity for the initiation of waves with short wave lengths is well below that defined by the Kelvin-Helmholtz instability relation.
کلیدواژه‌ها
Wave length؛ Kelvin-Helmholtz instability؛ two-phase stratified flow؛ wave growth

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