Dynamics of an in-Line Tube Array Subjected to Steam–water Cross-Flow. Part Iii: Fluidelastic Instability Tests and Comparison With Theory

Dynamics of an in-Line Tube Array Subjected to Steam–water Cross-Flow. Part Ii: Unsteady Fluid Forces

“…The excitation frequencies are 20, 15, 10, 5 and 2 Hz. It is clear that unlike the case of single-phase #ow (Tanaka & Takahara 1980;Chen 1983;Mureithi et al 1996), the force coe$cients are not simple single-valued functions of ;/fD. At constant ;/fD, the force coe$cients show variation depending on the combination of ; and f. This indicates that the homogeneous velocity may not be the true independent parameter.…”

Dynamics of an in-Line Tube Array Subjected to Steam–water Cross-Flow. Part I: Two-Phase Damping and Added Mass

“…A is approximately 2)1 m/s for tube S16 [see Part III, Hirota et al (2002)]. In general, damping was found to be marginally higher for the inclined array.…”

“…Unsteady #uid forces and stability measurement and analysis are presented in Mureithi et al (2002) and Hirota et al (2002), respectively. The main aspects of this work were previously reported in the series Nakamura et al (1996), Mureithi et al (1996) and Hirota et al (1996). Figure 1 shows the test loop and array geometry.…”

Development of Design Criteria for Fluid Induced Structural Vibration in Steam Generators and Heat Exchangers

“…The correlation seems to provide a satisfactory stability boundary that works for the authors' data and also those of some other experimenters. Recently, the same group (Nakamura et al, Hirota et al, Mureithi et al, 2002) has completed a series of tests providing some much needed data on damping and fluid-elastic instability in steam-water two-phase flow. Tests were carried out on an inline array and an array inclined at 30° to the direction of the flow.…”