The most advanced analytical treatment of annular two-phase flow is that of Dukler who considered downward co-current flow only. The present report describes its adaptation to upward co-current flow, both fluid dynamics and heat transfer being considered. Schematic diagrams have been prepared which illustrate the place of the analysis in calculations on two-phase flow, and a substantial amount of tabular material is presented which is abstracted from the numerical solutions obtained on the Harwell "Mercury" computer.
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