Two-Phase Flow Measurements with Orifice-Couple in Horizontal Pipe Line : 1st Report, Various Compositions of Orifices for Orifice-Couple and Appropriate Area Ratio of Opening

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An orifice-couple consisting of two segmental or eccentric orifices installed in series in the direction of flow was devised for component flow rate measurements in horizontal gas-liquid two-phase flow. One of the orifices takes its opening at the lower side of the tube cross section and the other at the upper side. Because the phase distribution in horizontal two-phase flow is, generally, asymmetric to the tube axis, the flow passing through the orifice-couple generates such two pressure differences as governed by the independent relationships between flow rate and pressure difference. The new device was applied to froth, separate and annular flow in the test tube of 26.0 mm in inner diameter. The experimental results show that the orifice-couple is effectively used to measure the component flow rate in every flow pattern tested, and that a suitable orifice is one of segmental opening with area ratio of 0.4〜0.6.
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