method and device for examining a two-phase middle flow in pipes.

摘要

First and second gamma ray attenuation measurements (10,17;10,16) are made with one-shot-collimators (22, 21) to measure repetitively the void fractions of said mixture in lower and upper portions (14L, 14U) of a transverse section through a pipe along which is flowing a gas and liquid mixture. Statistical features are derived from the measurements and are used in logical classification steps to determine the type of flow pattern (B, SW, AW, I, DB, SS), the profile of a large gas bubble in intermittent or slug flow, and the gas and liquid volume flow rates in slug flow.