| Abstract: | The interfacial friction was investigated for high-pressure (3 to 9 MPa) steam/water stratified-wavy flow, using the TPTF experimental data for 4 and 8-inch diameter horizontal pipe test sections. The interfacial waves observed in the stratified-wavy flow regime with void fractions typically <–0.6, became larger in r.m.s. amplitude and more irregular in both amplitude and wave length, as the transition boundary to slug flow was approached. A correlation to predict the interfacial friction factor has been obtained for the stratified-wavy flows including the vicinity of the transition boundary to slug flow. The correlation is based on two non-dimensional parameters related to the interfacial wave generation by the Kelvin-Helmholtz instability, and correlates the TPTF data taken under different pipe diameters and pressures. |
