Abstract

Phase separation is analysed for a two-phase mixture flowing through dividing tee junctions with a small ratio of branch to main pipe diameter. The case of a stratified flow in a horizontal main pipe connected to a horizontal, vertical upward or vertical downward branch is considered. A model is developed on the basis of the available data banks. A wide range of parameters is covered (pressure, 0.2–7 MPa; main pipe diameter, D = 80–284 mm; branch diameter, 4–34 mm). The model has been introduced in the CATHARE Pressurized Water Reactor (PWR) safety code, thereby leading to a considerable improvement of the code predictions.

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