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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December 2015
Research-Article
The Effect of Flat Bar Supports on Streamwise Fluidelastic Instability in Heat Exchanger Tube Arrays Available to Purchase
David S. Weaver
David S. Weaver
Mechanical Engineering Department,
e-mail: [email protected]
McMaster University
,Hamilton, ON L8S4L7
, Canada
e-mail: [email protected]
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Marwan Hassan
David S. Weaver
Mechanical Engineering Department,
e-mail: [email protected]
McMaster University
,Hamilton, ON L8S4L7
, Canada
e-mail: [email protected]
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. Dec 2015, 137(6): 061302 (8 pages)
Published Online: December 1, 2015
Article history
Received:
December 7, 2014
Revision Received:
March 3, 2015
Online:
April 16, 2015
Citation
Hassan, M., and Weaver, D. S. (December 1, 2015). "The Effect of Flat Bar Supports on Streamwise Fluidelastic Instability in Heat Exchanger Tube Arrays." ASME. J. Pressure Vessel Technol. December 2015; 137(6): 061302. https://doi.org/10.1115/1.4029973
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