Two-Phase-Flow-Induced Vibrations in a Horizontal Pulping System

摘要: This paper deals with experimental and theoretical analyses of the excitation mechanism vibrations induced by an air-and-water two-phase flow in a straight horizontal pipe. The experiment reveals strong relationship between first natural frequency piping system dominant void-signals -- that is, ratio being 1/2, 1/1, 3/2, when extraordinarily are observed. equation motion pipe conveying fluid is derived accounting for 1) inertia force, 2) pipe's elastic restoring 3) Coriolis' 4) centrifugal 5) pressure fluctuations, 6) momentum change due to time-varying density 7) gravity as external force. transformed into Mathieu's periodic term ; instability analysis concludes parametric resonance main causes such vibrations. Good agreement can be seen results.