TY - JOUR ID - 1009 TI - Wave length effect on Kelvin-Helmholtz instability criterion in two-phase stratified flow JO - Iranian Journal of Science and Technology Transactions of Mechanical Engineering JA - IJSTM LA - en SN - 2228-6187 Y1 - 2013 PY - 2013 VL - 24 IS - 3 SP - 259 EP - 267 KW - Wave length KW - Kelvin-Helmholtz instability KW - two-phase stratified flow KW - wave growth DO - 10.22099/ijstm.2013.1009 N2 - 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.   UR - https://ijstm.shirazu.ac.ir/article_1009.html L1 - ER -