关键词: interfacial shear stress;stratified flow;laser doppler velocitometer

Abstract: Experimental data are presented for the void fraction and theshear stresses of stratified
gas-liquid flow in a pipe. A new techniquewas used to measure the interface shear stress.
The interfacial shearstress was determined by using two methods: a momentum balance of
gasand an extrapolation of the Reynolds shear stress profile at the gas-liquidinterface. A
new formula , relating to the interfacial friction factor withthe void fraction and
superficial gas Reynold number, was developed to predict the interface shear stress . The
predicted values are in good agreement withexperimental data.

Key words: interfacial shear stress, stratified flow, laser doppler velocitometer