Unsteady gas-liquid two-phase flow and flow induced vibration
Abstract
Gas-liquid two-phase flow experiments were conducted on 90 degree pipe bends to study the internal two-phase flow induced force fluctuation. Multiple tri-axial force transducers were utilized to measure the dynamic force signals. Force spectra were analyzed to investigate the predominant frequency induced by the two-phase flow fluctuation. Experiments were performed at both upward and horizontal flow orientations with a variety of flow regimes. Related two-phase flow parameters such as volumetric fluxes, void fraction fluctuation and local pressure distribution around the pipe bends were also obtained to develop an extensive database. The results show that the predominant frequency of the force peaks in the slug flow regime with a fixed liquid flow rate. From the database, the model to predict the force fluctuation spectrum was obtained by integrating the local instantaneous equation of the two- fluid model over the test section control volume, and converting it onto the frequency domain. In addition, the impact force term due to slug flow, which has not been emphasized in literature for the internal two-phase flow induced vibration analysis, was successfully developed by utilizing the correlations for interfacial area concentration. The newly developed model is capable of predicting two-phase flow induced force fluctuation and dominant frequency range with satisfactory accuracy.
Degree
Ph.D.
Advisors
Ishii, Purdue University.
Subject Area
Engineering
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