0
Research Papers: Fluid-Structure Interaction

Further Study of Quasiperiodic Vibration Excitation Forces in Rotated Triangular Tube Bundles Subjected to Two-Phase Cross Flow

[+] Author and Article Information
C. Zhang, M. J. Pettigrew, N. W. Mureithi

Department of Mechanical Engineering, BWC/AECL/NSERC Chair of Fluid-Structure Interaction, École Polytechnique, Montréal, QC, H3T 1J4, Canada

J. Pressure Vessel Technol 131(3), 031303 (Apr 06, 2009) (8 pages) doi:10.1115/1.3095613 History: Received July 30, 2007; Revised November 07, 2008; Published April 06, 2009

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 or fatigue. Detailed vibration excitation force measurements in tube bundles subjected to two-phase cross flow are required to understand the underlying vibration excitation mechanisms. Some of this work has already been done. Somewhat unexpected but significant quasiperiodic forces in both the drag and lift directions were measured. These forces are generally larger in the drag direction. However, the excitation force frequency is relatively low (i.e., 3–6 Hz) and not directly dependent on flow velocity in the drag direction. On the other hand, much higher frequencies (up to 16 Hz) were observed in the lift direction at the higher flow velocities. The frequency appears directly related to flow velocity in the lift direction. The present work aims at (1) providing further evidence of the quasiperiodic lift force mechanism, (2) determining the effect of cylinder position on such quasiperiodic drag and lift forces, and (3) verifying the existence of quasiperiodic drag and lift forces in a more realistic larger tube array. The program was carried out with two rotated triangular tube arrays of different width subjected to air/water flow to simulate two-phase mixtures from liquid to 95% void fraction. Both the dynamic lift and drag forces were measured with strain gauge instrumented cylinders.

FIGURES IN THIS ARTICLE
<>
Copyright © 2009 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 2

Typical dynamic lift force spectra for water flow at 1 m/s pitch flow velocity: (a) single cylinder and (b)–(d) two cylinders at different pitches (4.5D, 3D, and 1.5D, respectively)

Grahic Jump Location
Figure 3

Typical dynamic lift force spectra for 80% void fraction at 5 m/s pitch flow velocity: (a) single cylinder and (b)–(d) two cylinders at different pitches (4.5D, 3D, and 1.5D, respectively)

Grahic Jump Location
Figure 4

Typical dynamic lift and drag force spectra for 80% void fraction at 5 m/s pitch flow velocity: (a) lift force spectra and (b) drag force spectra

Grahic Jump Location
Figure 5

Typical dynamic lift and drag force spectra for 80% void fraction at 10 m/s pitch flow velocity: (a) lift force spectra and (b) drag force spectra

Grahic Jump Location
Figure 6

Correlation of the lift and drag forces between different cylinder positions for 80% void fraction at 5 m/s pitch flow velocity: (a) lift and (b) drag

Grahic Jump Location
Figure 7

Correlation of the lift and drag forces between different cylinder positions for 80% void fraction at 10 m/s pitch flow velocity: (a) lift and (b) drag

Grahic Jump Location
Figure 8

Comparison of the dynamic lift and drag forces between the wider test section and the narrow test section for 80% void fraction at 5 m/s pitch flow velocity: (a)–(c) for lift forces and (d)–(f) for drag forces (the letter N is for the narrow test section)

Grahic Jump Location
Figure 9

Comparison of the dynamic lift and drag forces between the wider test section and the narrow test section for 80% void fraction at 10 m/s pitch flow velocity: (a)–(d) for lift forces and (e)–(h) for drag forces (the letter N is for the narrow test section)

Grahic Jump Location
Figure 10

Correlation of the lift and drag forces between different cylinder positions for 80% void fraction at 5 m/s pitch flow velocity: (a) lift and (b) drag

Grahic Jump Location
Figure 11

Correlation of the lift and drag forces between different cylinder positions for 80% void fraction at 10 m/s pitch flow velocity: (a) lift and (b) drag

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In