Two-Phase Flow-Induced Vibration: An Overview (Survey Paper)

Abstract

Two-phase flow exists in many industrial components. To avoid costly vibration problems, sound technology in the area of two-phase flow-induced vibration is required. This paper is an overview of the principal mechanisms governing vibration in two-phase flow. Dynamic parameters such as hydrodynamic mass and damping are discussed. Vibration excitation mechanisms in axial flow are outlined. These include fluidelastic instability, phase-change noise, and random excitation. Vibration excitation mechanisms in cross-flow, such as fluidelastic instability, periodic wake shedding, and random excitation, are reviewed.

Modelling Two-Phase Flow-Excited Damping and Fluidelastic Instability in Tube Arrays

“…The normalized two-phase component of damping ratio, ðz TP Þ D , is plotted in Figure 10(d) along with the other data. Though it is not yet known which parameters are valid for normalizing the two-phase damping data for different fluids, the present study follows a method proposed by Pettigrew & Taylor (1994) …”

“…Axisa et al measured damping in the fully flexible bundle, but the void fraction range of their data was high, so that fluid coupling was likely less of a problem. The design criterion of Pettigrew & Taylor (1994) for the determination of critical flow velocity is indicated by the solid line on Figure 12 for P=D ratios of between 1Á4 and 1Á5 in continuous flow regimes (i.e., bubbly). This follows from Connors' relationship…”

“…More recently, researchers have expanded the study to two-phase flows, which occur in nuclear steam generators and many other tubular heat exchangers. For an overview of two-phase flowinduced vibration research, see Pettigrew & Taylor (1994).…”

Measurement of Steady and Unsteady Hydrodynamic Loads on a Nuclear Fuel Bundle

“…At Atomic Energy of Canada Limited (AECL), Pettigrew and co-workers have estimated the spectral density of the effective force per unit length acting on single flexible cylinders (i.e., fuel elements and steam-generator tubes) based on modal vibration amplitudes and modal characteristics (Pettigrew & Gorman 1981;Pettigrew & Taylor 1994). This approach assumes that the pressure field is homogeneous and that the frequency content is broadbanded relative to the cylinders frequency response.…”

Theoretical Study on the Dynamic Behavior of Pipes Conveying Gas-Liquid Flow

“…[1][2][3][4]. Fundamental experimental studies have shown a strong influence of two-phase flow parameters, such as mixture velocity, void fraction, flow pattern and slip, on the structural vibration response [5][6][7][8][9]. In the specific case of the frequency of the system, recently experimental results [8] indicate this parameter increases with increasing void fraction due to the effect of hydrodynamic mass (added mass).…”