The energetics of flow through a rapidly oscillating tube. Part 1. General theory

Whittaker, Robert J. ORCID:, Waters, Sarah L., Jensen, Oliver E., Boyle, Jonathan and Heil, Matthias (2010) The energetics of flow through a rapidly oscillating tube. Part 1. General theory. Journal of Fluid Mechanics, 648. pp. 83-121. ISSN 0022-1120

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We examine the effect of prescribed wall-driven oscillations of a flexible tube of arbitrary cross-section, through which a flow is driven by prescribing either a steady flux at the downstream end or a steady pressure difference between the ends. A large-Womersley-number large-Strouhal-number regime is considered, in which the oscillations of the wall are small in amplitude, but sufficiently rapid to ensure viscous effects are confined to a thin boundary layer. We derive asymptotic expressions for the flow fields and evaluate the energy budget. A general result for the conditions under which there is zero net energy transfer from the flow to the wall is provided. This is presented as a critical inverse Strouhal number (a dimensionless measure of the background flow rate) which is expressed only in terms of the tube geometry, the fluid properties and the profile of the prescribed wall oscillations. Our results identify an essential component of a fundamental mechanism for self-excited oscillations in three-dimensional collapsible tube flows, and enable us to assess how geometric and flow properties affect the stability of the system.

Item Type: Article
Faculty \ School: Faculty of Science > School of Mathematics
UEA Research Groups: Faculty of Science > Research Groups > Fluid and Solid Mechanics
Depositing User: Robert Whittaker
Date Deposited: 10 Mar 2011 12:47
Last Modified: 23 Oct 2022 01:43
DOI: 10.1017/S0022112009992904

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