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Technology Reviews

Mechanics of Pipes Conveying Fluids—Part II: Applications and Fluidelastic Problems

[+] Author and Article Information
R. A. Ibrahim

Department of Mechanical Engineering, Wayne State University, Detroit, MI 48202

In physical chemistry, the van der Waals force (or van der Waals interaction) represents the attractive or repulsive force between molecules (or between parts of the same molecule) other than those due to covalent bonds or to the electrostatic interaction of ions with one another or with neutral molecules.

J. Pressure Vessel Technol 133(2), 024001 (Feb 28, 2011) (30 pages) doi:10.1115/1.4001270 History: Received November 20, 2009; Revised January 12, 2010; Published February 28, 2011; Online February 28, 2011

This paper is the second part of the two-part review article presenting an overview of mechanics of pipes conveying fluid and related problems such as the fluid-elastic instability under conditions of turbulence in nuclear power plants. In the first part, different types of modeling, dynamic analysis and stability regimes of pipes conveying fluid restrained by elastic or inelastic barriers were described. The dynamic and stability behaviors of pinned-pinned, clamped-clamped, and cantilevered pipes conveying fluid together with curved and articulated pipes were discussed. Other problems such as pipes made of viscoelastic materials and active control of severe pipe vibrations were considered. The first part was closed by conclusions highlighting resolved and nonresolved controversies reported in the literature. The second part will address the problem of fluidelastic instability 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 a progressive damage at the supports through fretting wear or fatigue. Antivibration bar supports used to limit pipe vibrations are described. An assessment of analytical, numerical, and experimental techniques of fretting-wear problem of pipes in heat exchangers will be given. Other topics related to this part include remote impact analysis and parameter identification, pipe damage-induced by pressure elastic waves, the dynamic response and stability of long pipes, marine risers together with pipes aspirating fluid, and carbon nanotubes conveying fluid.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Time history records showing typical wave generated by an impact on a beam, showing the contribution of reflected waves: (a) response of accelerometer measuring wave at distance 0.753 m from impact and (b) response of another accelerometer measuring wave at distance 2.252 m from impact (246)

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Figure 2

Measured and estimated impact forces at distance 0.753 m from impact (246)

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Figure 3

Comparison between measured and identified impact forces: (a) measured and (b) final identification (243)

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