...Heng Su; Yegao Qu; Zhike Peng This paper is concerned with experimental analyses on the vibration behaviors of a horizontal pipe containing gas–liquid two-phase flow with different flow patterns. The effects of flow patterns and superficial velocities on pressure fluctuations and structural...

... to manufacturing tolerances and tubes' curvature in the U-bend region. Thus, this investigation aims to understand the rule of frequency variation (detuning) on FEI in two-phase flow. This includes investigating the effect of detuning on transverse and streamwise FEI for air–water mixture flow. The role of FEI...

...M. Giraudeau; N. W. Mureithi; M. J. Pettigrew The second part consists of our two-phase flow-induced force measurements in the 52 mm diameter U-tube. Supported by previous results in a 20 mm diameter U-tube, a frequency formulation in terms of homogeneous void fraction is used to predict...

... and sliding motion of the tubes against their supports, bulk process conditions and local two-phase flow properties. Details of the test rig setup and the measurement techniques are described in the paper. Moreover, a numerical prediction of the U-tube vibration response to flow was performed with AECL’s pipo...

... in single- and two-phase flows and fretting wear in process equipment, such as heat exchangers and steam generators. Connors critical velocity will be discussed as a measure of initiating fluidelastic instability. Vibro-impact of heat exchanger tubes and the random excitation by the cross-flow can produce...

...M. F. Cargnelutti; S. P. C. Belfroid; W. Schiferli Two-phase flow occurs in many situations in industry. Under certain circumstances, it can be a source of flow-induced vibrations. The forces generated can be sufficiently large to affect the performance or efficiency of an industrial device...

... of viscoelastic materials and active control of severe pipe vibrations are considered. This part will be closed by conclusions highlighting resolved and nonresolved controversies reported in literature. The second part will address the problem of fluid-elastic instability in single- and two-phase flows...

... 2008 25 02 2009 02 09 2009 damping flow instability heat exchangers pipe flow pipes refrigerants turbulence two-phase flow vibrations Two-phase cross flow exists in approximately half of shell-and-tube heat exchangers in process and nuclear plants. Typical components...

...In-Cheol Chu; Heung June Chung; Chang Hee Lee Fluid-elastic instability characteristics of a U-tube bundle were experimentally investigated in air-water two-phase flow. A total of 39 U-tubes were arranged in a rotated square array with a pitch-to-diameter ratio of 1.633. Vibration responses of four...

... two-phase flow regimes. Beyond these drag periodic frequencies, the coherences between two neighborly positions in the same column (L3 & L4 and R3 & R4 in Figs. 10b 11b ) are highest, while the coherences between every two other positions in the same column (C3 & C5 in Figs. 10b 11b...

... stability thresholds of the present study agree well with results from previous studies for single-phase flow. In two-phase flow, the comparison of the stability data depends on the definition of two-phase flow velocity. Weaver , D. S. , and Schneider , W. G. , 1983 , “ The Effect of Flat...

...Jong Chull Jo; Dong Gu Kang; Kyung Wan Roh Two-phase flow fields inside feeder pipes of a CANada Deuterium Uranium (CANDU) reactor have been simulated numerically using a computational fluid dynamics (CFD) code to calculate the shear stress distribution, which is the most important factor...

...Jong Chull Jo; Woong Sik Kim; Chang-Yong Choi; Yong Kab Lee This paper addresses the numerical simulation of two-phase flow heat transfer in the helically coiled tubes of an integral type pressurized water reactor steam generator under normal operation using a computational fluid dynamics code...

... and downstream cylinders, a phenomenon perhaps even more important in two-phase flows because of void differences between the main flow path and the wake area between upstream and downstream cylinders. To answer these questions, we have recently done some tests with a wider test section including three columns...

... as a one-dimensional compressible two-phase flow in the radial direction in spherical coordinates. We adopted the cubic interpolated pseudoparticle combined unified procedure method, which is a unified analysis method for both compressible and incompressible fluids proposed by Yabe and Wang (1991, “Unidied...

... 03 2006 two-phase flow vibrations pipe flow external flows wear fatigue fracture heat exchangers drag Two-phase cross flow exists in many shell-and-tube heat exchangers. Flow-induced vibration excitation forces can cause tube motion that will result in long-term fretting-wear...

...J.-L. Riverin; M. J. Pettigrew Severe vibrations were observed in a small piping system comprising two elbows and straight sections configured in the form of a U and subjected to air-water internal two-phase flow. An experimental study was undertaken to investigate the governing vibration...

... in the flow direction. These results and additional wind tunnel results are compared to existing data on fluidelastic instability. Two-phase flow damping results are also presented in this paper. 02 09 2005 05 10 2005 flow instability heat exchangers pipe flow two-phase flow nuclear...

...Bin Liu; Mauricio Prado For any pumping artificial lift system in the petroleum industry, the free gas significantly affects the performance of the pump and the system above the pump. A model, though not a complete two-phase flow model, has been developed for the effective prediction of separation...

..., “Two-Phase Flow through Electrical Submersible Pumps,” Ph.D. dissertation, The University of Tulsa, Oklahoma; 1994, “Performance of Electric Submersible Pumps in Gassy Wells,” SPE Prod. Facil., 9 , pp. 55–60) in the petroleum industry and generalized the Minemura model (Minemura, K., Uchiyama, T...