... 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...

.... Assoc. Editor: Jong Chull Jo. 04 11 2011 29 03 2013 Momentum variation in two-phase flow generates significant low frequency forces, capable of producing unwanted and destructive vibrations in nuclear or petroleum industries. Two-phase flow-induced forces in piping were previously...

... 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...

...-induced excitation forces seem to be dominated more by localized flow regimes than bundle flow regimes. The Grant flow map ( 19 ) for two-phase flow in tube bundles was useful in the discussion of fluidelastic instability, but was not helpful in explaining the turbulence-induced excitation results...

...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...

... by the tube bundle itself. Experimental data obtained for different kinds of fluids and tube bundles have been satisfactorily compared through the use of adequate data-reduction procedures ( 1 2 3 ). In the case of two-phase flows, such an extensive study has not been undertaken, though it is known...

... 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...

... exchangers pipe flow probes two-phase flow vibrations wakes wear Two-phase cross flow exists in many shell-and-tube heat exchangers, for instance, in the U-tube region of nuclear steam generators. Flow-induced vibration excitation forces can cause excessive vibration that may result in long...

... 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...

... somewhat better correlated than the lift forces. The periodic forces are also dependent on the position of the cylinder within the bundle. 22 09 2005 31 03 2006 two-phase flow vibrations pipe flow external flows wear fatigue fracture heat exchangers drag Two-phase cross...

...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...

...-turbulence excitation. For the first time, in a U-bend tube bundle with liquid or two-phase flow, fluidelastic instability was observed both in the out-of-plane and in the in-plane direction. This raises the possibility of higher-than-expected tube-to-support work-rates for U-tubes restrained by flat bars...