Tube vibration in industrial size test heat exchanger (30/sup 0/ triangular layout - six crosspass configuration)

Wambsganss, M.W.; Halle, H.; Lawrence, W.P.

doi:10.2172/5593138

Cited by 5 publications

(7 citation statements)

References 5 publications

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“…This type of dynamic response behavior, viz., a gradual increase to large amplitude motion, is not uncommon, especially with dense fluids, and has been observed in laboratory tests [4]. However, as discussed in an earlier report [2], it does make definition of a critical flowrate more difficult as there is no abrupt increase in response to positively identify the threshold.…”

Section: Cmentioning

confidence: 87%

“…Test Procedure/Data Processing For the sake of completeness some of the discussion presented on this topic in the previous test reports [1,2] is repeated here. It is practically not possible to instrument all of the more than 400 tubes in the bundle, or even the somewhat smaller number of tubes in the window regions that will b more susceptible to vibration by virtue of their lower natural frequencies.…”

Section: Cmentioning

confidence: 99%

“…1 as installed in the Argonne National Laboratory's Flow Induced Vibration Test Facility (FIVTF), and is described in a later section of this report. The initial test work with tube bundles on a 30° triangular layout -oriented with one side of the equilateral triangle perpendicular to the flow direction -and with a pi'cch-to-diaraeter ratio of 1.25 has been reported previously [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…The first test report [1] covers five different test cases of eight-crosspass (seven equally spaced baffles) bundles with different inlet/outlet nozzle diameters for bo full bundle and no-tubes-inwindow (NTIW) configurations. A following report [2] presents the results of tests with six-crosspass (five equally spaced baffles) bundles, also on a 30° triangular layout with a 1.25 pitch-to-diameter ratio. The ten reported test cases include a full tube bundle, NTIW bundle, several proposed field fixes, and a bundle with finned tubes.…”

Section: Introductionmentioning

confidence: 99%

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Tube vibration in industrial-size test heat exchanger (90/sup 0/ square layout)

Halle¹,

Wambsganss²

1983

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DISCLAIMERThis report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legaS liability c r responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, rccommendation, or favoring by the United States Government or any agency thereof. The views B1STWBIITP Or THIS DOCUMENT !* r.nri opinions of authors expressed herein do not necessarily stete cr reflect thete of the United Slate; Government or any agency thereof. of field and design fixes indicate that the onset of instability can be delayed to a higher critical flowrate.In addition, pressure drop measurements were taken to contribute to the understanding of heat exchanger performance.It should be noted that Heat Transfer Research, Inc. (HTRI), a not-forprofit research organization with over 175 members representing heat exchanger designers, manufacturers, and users, is retained as a consultant to the program. HTRI serves as an important two-way link with industry, it provides the needed input relative to practical commercial designs, problems experienced in the field, field and design fixes, and assists to transfer the results of this test program to the industry. II. BACKGROUND The second of the subject program's test reports [2] presented an extensive discussion of the background information, divided into the main topics of "instability raechanlsms" and "criteria for determining critical flow." The latter lists five criteria: sensory observations, vibration amplitude vs. flow-response rate, vibration amplitude vs. flow-amplitude threshold, flow sweep-time history, and frequency response data. Aβ discussed in Ref. 2, each of the five criteria has advantages and disadvantages relative to another. In the analysis and interpretation of data from the subject tests, all five methods are employed to various degrees. However, a heavier reliance is placed on time histories from flow sweeps and examination of the rate of increase of vibration response with flowrate (vibration amplitude vs. flow-response rate criterion) to identify the abrupt increase in response which characterizes the onset of instability. The reader is referred to the detailed presentation In the "background" cVapter of Reference 2.

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Section: Cmentioning

confidence: 87%

Section: Cmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tube vibration in industrial-size test heat exchanger (90/sup 0/ square layout)

Halle¹,

Wambsganss²

1983

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“…Wambsganss et al [13] observed that, for the industrial size shell-and-tube exchanger used in their tests, the primary contribution to the vibration response was in the frequency range from 10 to 80 Hz; it was also observed that tube response associated with fluidelastic instability typically occurred in the frequency range of 20 to 30 Hz.…”

Section: A Tube Motionmentioning

confidence: 99%

Experimental Study on Impact/Fretting Wear in Heat Exchanger Tubes

Wambsganss

Jendrzejczyk

1987

Journal of Pressure Vessel Technology

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The failures can be attributed to impact and/or fretting wear due to flow-induced vibrations.In spite of the occurrence of serious wear problems in heat exchangers, only a few investigations have been reported.The objective of this study is to provide qualitative impact/fretting wear information for heat exchanger tubes through the performance of a series of tests involving the pertinent parameters:impact force level, between the tube and its support; tube to support plate hole clearance;tube support plate thickness; and tube vibration frequency.The characteristics of impact/fretting wear relative to tube motion pattern, material combination and surrounding fluid were also investigated. The test apparatus consists of a cantilevered tube with a simulated tube support plate at the "free end". Tube vibration is induced by an electromagnetic exciter to simulate the flow-induced tube motion occurring in a real heat exchanger at the tube/tube support plate interface. Tests are conducted in air, water, and oil, all at room temperature.Removable wear rings are attached to the tube free end and simulated support fixture.Wear ring materials include carbon steel, 304 stainless steel, Inconel 600 and brass. The resulting impact/fretting wear is measured by the weight loss technique.The principal results of the tests are as follows: Wear rate increases significantly with the magnitude of the impact force between the tube and its support plate; the degree and trend of the wear rates are highly dependent on the mechanical and metallurgical properties of the tube/support material combination; the rate of impact/fretting wear decreases with increasing frequency.The results also show that the wear rate for carbon steel in water is greater in comparison with the values from the in-air tests.On the other hand, the wear rate from tests in oil is very much lower than the results from the tests in both air and water.An empirical formula is proposed to correlate the experimental impact/fretting wear results.

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Damping of Cylindrical Structures in Single‐Phase Fluids

Pettigrew¹

2021

Flow‐Induced Vibration Handbook for Nuclear and Process Equipment

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Tube vibration in industrial size test heat exchanger (30/sup 0/ triangular layout - six crosspass configuration)

Cited by 5 publications

References 5 publications

Tube vibration in industrial-size test heat exchanger (90/sup 0/ square layout)

Tube vibration in industrial-size test heat exchanger (90/sup 0/ square layout)

Experimental Study on Impact/Fretting Wear in Heat Exchanger Tubes

Damping of Cylindrical Structures in Single‐Phase Fluids

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