Research Papers: Fluid-Structure Interaction

The Effect of Flat Bar Supports on Streamwise Fluidelastic Instability in Heat Exchanger Tube Arrays

[+] Author and Article Information
Marwan Hassan

School of Engineering,
University of Guelph,
Guelph, ON N1G2W1, Canada
e-mail: mahassan@uoguelph.ca

David S. Weaver

Mechanical Engineering Department,
McMaster University,
Hamilton, ON L8S4L7, Canada
e-mail: weaverds@mcmaster.ca

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received December 7, 2014; final manuscript received March 3, 2015; published online April 16, 2015. Assoc. Editor: Jong Chull Jo.

J. Pressure Vessel Technol 137(6), 061302 (Dec 01, 2015) (8 pages) Paper No: PVT-14-1198; doi: 10.1115/1.4029973 History: Received December 07, 2014; Revised March 03, 2015; Online April 16, 2015

Flow-induced vibration is an important criterion for the design of heat exchangers in nuclear, fossil, and chemical plants. Of the several known vibration excitation mechanisms, fluidelastic instability (FEI) is the most serious because it can cause tube failures in a relatively short period of time. Traditionally, FEI has been observed to occur in the direction transverse to the flow and antivibration bars have been used to stiffen the tubes against this motion. More recently, interest has increased in the possibility of FEI occurring in the streamwise direction, parallel to the flow. This is the subject of the present paper. Numerical simulations have been carried out to study the effects of tube-to-support clearance, tube sliding friction, tube-to-support preload, and ambient turbulence levels on the FEI threshold in the streamwise direction. As one would expect, increasing friction and tube preload against the support both tend to stabilize the tube against streamwise FEI. Importantly, the results also show that decreasing tube-support clearances destabilizes streamwise FEI while having little effect on transverse FEI. Increasing ambient turbulence levels also has the effect of destabilizing streamwise FEI.

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Fig. 1

Tube-support model

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Fig. 2

Response spectra for the streamwise (a) and (b) and transverse (c) and (d) directions: (a) and (c) 1 m/s; (b) and (d) 7 m/s

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Fig. 3

Datum case for tube response, no friction, and the tube centered (no preload). (a) Streamwise response and (b) transverse response.

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Fig. 4

Effect of varying support clearance for a centered tube (no preload) and coefficient of friction of 0.2. (a) Streamwise response and (b) transverse response.

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Fig. 5

Effect of tube-support preload on the streamwise response of a tube with a clearance of 0.01 mm and kinematic friction coefficient of 0.2

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Fig. 6

Effect of the coefficient of friction on the streamwise response of a preloaded tube (1.11 N) with clearance of 0.01 mm

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Fig. 7

Effect of turbulence level on streamwise response of a preloaded tube (1.0 N) with 0.01 mm clearance and friction coefficient of 0.2

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Fig. 8

The streamwise response waveform for a preloaded tube (0.55 N) with 0.12 mm clearance and friction coefficient of 0.2. (a) and (c) U = 3.5 m/s; (b) and (d) U = 4.2 m/s.




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