... of the water level motion and a criterion of the flow instability are derived and discussed. To the best of the authors' knowledge, there seems little works addressing the instability in the natural circulation loop available. Leidenfrost and Modrei [ 2 ] performed an experimental study to investigate heat...

... velocities ranging from less than 1 m/s to as high as 6 m/s. CANDU steam generators flow-induced vibration multispan U-tubes two-phase flow bars boilers design engineering dynamic response elasticity flow instability flow measurement heat transfer mechanical testing numerical...

.... , and Chan , A. M. C. , 1999 , “ Investigation of Two-Phase Flow Regimes in Tube Bundles Under Cross-Flow Conditions ,” Int. J. Multiphase Flow , 25 , pp. 857 – 874 . 10.1016/S0301-9322(98)00075-5 01 02 2011 27 04 2011 03 10 2011 03 10 2011 drag elasticity flow...

... gauge integrity is shown in the large RMS amplitudes at reduced velocities below 50. The uncertainty here is recognized in the range of reduced velocities taken for the stability threshold, 50–75. flow instability heat exchangers pipe flow pipes turbulence vibrations vortices wear...

... 06 08 2010 06 08 2010 boilers damping elasticity flow instability heat exchangers hydraulic systems pipe flow wind tunnels Nuclear steam generator tubes subjected to cross-flow have worn through and failed due to oscillatory contacts with adjacent tubes or flat bar...

... to predict possible damage in the operating equipment. cantilevers damping drag elasticity flow instability pipes turbulence vibration control 23 10 2009 24 04 2010 21 07 2010 21 07 2010 Weaver , D. , Ziada , S. , Au-Yang , M. , Chen , S...

.... , 1985 , “ Flow Patterns in Vertical Two-Phase Flow ,” Int. J. Multiphase Flow 0301-9322 , 11 , pp. 161 – 175 . 10.1016/0301-9322(85)90043-6 24 07 2008 25 02 2009 02 09 2009 damping flow instability heat exchangers pipe flow pipes refrigerants turbulence two-phase...

... elasticity flow instability pipe flow two-phase flow 03 01 2008 11 02 2009 12 06 2009 The most general method to predict fluid-elastic instability would be Connors’ equation ( 2 ), which can be formulated in terms of the dimensionless “reduced velocity” and “mass damping...

... 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. 11 08 2006 24 10 2008 04 02 2009 flow instability heat...

... and swirls increase the rate of energy dissipation of the sloshing. 07 11 2006 26 04 2007 20 08 2008 damping earthquake engineering flow instability sloshing vortices water storage It is well known that sloshing in liquid storage vessels can be excited by the long periodic...

... 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...

... 2004 computational fluid dynamics flow instability damping pressure vibrations mechanical stability confined flow Up to this time, some research has been conducted on natural frequencies and flow-induced vibrations of the bellows due to internal fluid flow. Jakubauskas and Weaver...

..., such as by Au-Yang 1 , Blevins 2 , Chen 3 , Paı¨doussis 4 , Pettigrew and Taylor 5 , Price 6 , and Weaver and Fitzpatrick 7 . heat exchangers external flows pipe flow mechanical stability jets flow instability failure (mechanical) elasticity fatigue wind tunnels 29 September...

... boundary layer turbulence computational fluid dynamics flow simulation flow instability pattern formation In many industrial configurations, mechanical structures such as PWR components are submitted to complex flows causing possible vibrations and damage, 2 3 4 5 6 7 , and as far...

... vibrations flow instability damping flow measurement input-output stability flow control 22 July 2001 29 January 2002 24 January 2003 05 05 2003 Contributed by the Pressure Vessels and Piping Division and presented at the Pressure Vessels and Piping Conference, Atlanta...

...-phase cross flow. pressure vessels vibrations power plants flow instability mixtures Many power and process plant components operate in two-phase flow, under high flow rates and adverse environmental conditions. For example, it has been estimated that more than half of nuclear...

...; revised manuscript received July 10, 2001. Associate Editor: M. J. Pettigrew. 22 July 2001 29 March 2001 10 July 2001 heat exchangers vibrations fluid dynamics flow instability vortices There has been an increased effort in recent years to improve the heat transfer...

... failure (mechanical) vibrations damping flow instability fission reactor coolants channel flow Parallel-plate assemblies are used as core elements in some research and power nuclear reactors. A parallel-plate assembly consists of many thin plates stacked in parallel; between the plates...

... by the PVP Division, January 20, 1999; revised manuscript received October 26, 1999. Associate Technical Editor: S. S. Chen. 20 January 1999 26 October 1999 mechanical stability flexible structures vibrations fission reactor coolants confined flow flow instability A fluid...