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3. Fisher, S. A. and D. L., Pearce, “A theoretical model for describing horizontal annular flows”, Int. Sem. Heat Mass Transfer, Two Phase Flow in Energy and Chem. Systems, Dubrovnik, Yugoslavia, Paper No. 3.3-5 (sep. 4-8, 1978).
4. An analysis of geometry and pressure drop for the horizontal, annular, two phase flow of water and air in the entrance region of a pipe;Jacowitz;Chem. Eng. Sci.,1964