比較的大きな口径の水平管内水-空気二相流 : 第2報, 圧力損失について

概要

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Pressure drop data measured in experiments on air/water two-phase flow in a comparatively large and long horizontal pipe of 210mm in diameter and 30.5m in length were analyzed. The traditional method based upon the Lockhart-Martinelli parameter X and the two-phase flow pressure drop multiplier could not consistently represent the pressure drop data. The measured pressure drop increased with increases in air and water velocities, which resulted from the growth of a wave. A new concept to calculate the pressure drop for wavy flow is proposed wherein the pressure drop of the gas phase results from the form loss of the contraction and the expansion of gas flow when it passes the crest of the wave. Therefore, the pressure drop of wavy stratified flow is closely related to the wave properties. The void fractions calculated with the proposed concept are in good agreement with the measured results.
社団法人日本機械学会の論文
1990-12-25