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New experimental data indicate that mass flux in cocurrent gas-liquid flows may be determined by the use of Pitot tubes in conjunction with a local mixture density measurement technique. The data were taken over a wide range of flow regimes in a horizontal pipe and included separated patterns such as stratified and annular flows. Local mixture densities were obtained by a computer-assisted algebraic reconstruction technique that used chordal average densities measured by traversing gamma beam attenuation.The results extend the applicability of this mass flux measurement technique well beyond the relatively homogeneous, high-pressure, steam-water flow situations originally studied by Banejee and Nguyen (1977). K-F F-L HAUAlChE J o u r n a l (Vol. 27. No. 2) March, 1981 P o p 177 proved successful and may be of use in applications where the average phase distribution is needed. The main conclusion that can be drawn from this and earlier work is that a model for Pitot tube response analogous to that for single-phase flow, gives good predictions of cross-section averaged mass flux.Ideally, a sufficient number of Pitot tube and local mixture density measurements must be made to get good coverage over the flow cross-section. However, our experiments indicate that relatively few Pitot tube measurements may be used together with the appropriate chordal average mixture densities to predict average mass flux quite well. This is important in applications, because equipment for measuring these quantities are easy to fabricate and install.