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research-article

Near-Wake Characteristics and Acoustic Resonance Excitation of Crimped Spirally Finned Cylinders in Cross-Flow

[+] Author and Article Information
Mohammed Alziadeh

Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, Oshawa, Ontario, Canada
mohammed.alziadeh@uoit.ca

Atef Mohany

Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, Oshawa, Ontario, Canada
atef.mohany@uoit.ca

1Corresponding author.

ASME doi:10.1115/1.4040549 History: Received March 25, 2018; Revised June 04, 2018

Abstract

This paper presents an experimental investigation of the near-wake flow characteristics for isolated crimped spirally finned cylinders in cross-flow, and its influence on the generated sound pressure during flow-excited acoustic resonance. Four crimped spirally finned cylinders are investigated, which have pitch-to-root diameter ratio (p/Dr) ranging between 0.384 = p/Dr = 1. The addition of crimped spiral fins weakens and reduces the coherence of the vortex shedding process as compared to that of a bare cylinder. It has also been shown that the addition of crimped spiral fins elongated the vortex formation length. A larger velocity deficit was also observed in the near-wake of the crimped spirally finned cylinders. Reduction in the pitch-to-diameter ratio (p/Dr) led to a progressive increase in the strength and coherence of the vortex shedding process. It also caused a gradual reduction in the vortex formation length and velocity deficit. The near-wake flow characteristics of the crimped spirally finned cylinders has shown to inherently affect the generated sound pressure during flow-excited acoustic resonance. Furthermore, it has been observed that the helical fins impose an asymmetrical inclination in the acoustic particle velocity. This resulted in weaker flow-acoustic coupling, which hindered the energy transfer between the flow field and the sound field. The findings of this investigation provide better understanding of the complex flow-sound interaction mechanism from crimped spirally finned cylinders in heat exchanger tube bundle.

Copyright (c) 2018 by ASME
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