Journal ArticleDOI
Vibration damping in multispan heat exchanger tubes
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TLDR
In this article, a single vertical heat exchanger tube with multiple spans was excited by random vibration, and the frequency response spectra and resonant peak-fitted damping ratios were calculated for all tests.Abstract:
Heat exchanger tubes can be damaged or fail if subjected to excessive flow-induced vibration, either from fatigue or fretting-wear. Good heat exchanger design requires that the designer understands and accounts for the vibration mechanisms that might occur, such as vortex shedding, turbulent excitation or fluidelastic instability. To incorporate these phenomena into a flow-induced vibration analysis of a heat exchanger requires information about damping. Damping in multispan heat exchanger tubes largely consists of three components: viscous damping along the tube, and friction and squeeze-film damping at the supports. Unlike viscous damping, squeeze-film damping and friction damage are poorly understood and difficult to measure. In addition, the effect of temperature-dependent fluid viscosity on tube damping has not been verified. To investigate these problems, a single vertical heat exchanger tube with multiple spans was excited by random vibration. Tests were conducted in air and in water at three different temperatures (25, 60, and 90 C). At room temperature, tests were carried out at five different preloads. Frequency response spectra and resonant peak-fitted damping ratios were calculated for all tests. Energy dissipation rates at the supports and the rate of excitation energy input were also measured. Results indicate that damping does not change overmore » the range of temperatures tested and friction damping is very dependent on preload.« lessread more
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Journal ArticleDOI
Flow-induced vibration : recent findings and open questions
TL;DR: In this paper, a review of the recent findings in the area of flow-induced vibration and some of the remaining questions are discussed, with particular emphasis on fluidelastic instability and damping in two-phase flows.
Journal ArticleDOI
Mechanics of Pipes Conveying Fluids—Part II: Applications and Fluidelastic Problems
TL;DR: In this paper, the authors present 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.
Journal ArticleDOI
Experimental investigation on sliding and fretting wear of steam generator tube materials
Dong-Goo Kim,Young-Ze Lee +1 more
TL;DR: In this article, the sliding and fretting wear tests were performed using Inconel 600HTMA and 690TT against STS 304, which are the steam generator tube materials.
Journal ArticleDOI
Friction and wear of Inconel 690 and Inconel 600 for steam generator tube in room temperature water
TL;DR: In this paper, a cross-cylinder type set-up was used to perform fretting tests in room temperature water with Inconel 690 and 690 in contact with STS 304.
Journal ArticleDOI
The response of alloy 690 tubing in a pressurized water reactor environment
TL;DR: In this paper, the authors compared the corrosion-fatigue data on Alloy 690 plate with test data obtained using steam generator tubing and concluded that the results on plate material documented in the open literature is not representative of actual behavior of steam generator tube due to the mutually interactive influences of microstructural features, section thickness and processing variables.
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