### An Approach for the Analysis of Collapse Onset in Elastic Tube FlowsAn Approach for the Analysis of Collapse Onset in Elastic Tube Flows

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 Author Çarpınlıoğlu, Melda Özdinç ♦ Oruç, Vedat Source SpringerLink Content type Text Publisher Springer-Verlag File Format PDF Copyright Year ©2010 Language English
 Subject Domain (in DDC) Technology ♦ Engineering & allied operations Subject Keyword Collapse onset ♦ Flow rate limitation ♦ Transmural pressure ♦ Circumferential bending stiffness ♦ Non-dimensional pressure parameter ♦ Engineering ♦ Science Abstract An experimental study conducted for the determination of the onset of collapse of an elastic tube of a Starling resistor conveying air is presented herein. The collapse was induced under the action of external pressure p $_{e}$ applied to the tube walls. The influence of length L, thickness h, and modulus of elasticity E of the tube on collapse were determined by using a variety of silicone rubber and latex-Penrose tubes. The experiments were conducted under the presence of constant upstream head with the absence of a longitudinal strain of the tube in a range of flow Reynolds number (Re) 16750 < Re < 70280. At each air flow rate Q through the tube, p $_{e}$ was increased gradually. The inlet and exit pressures of the tubes p $_{1}$ and p $_{2}$ were measured. The variation of Q with p $_{e}$ was used to determine the onset of collapse. The magnitude of p $_{e}$ at the onset of collapse was defined as p $_{e,c}$. The visually observed collapse was associated with a flow rate reduction, followed by so-called oscillating and non-oscillating cases. The experimental data at the onset of collapse were expressed in terms of a correlation between Re (h/L) and a non-dimensional pressure parameter defined as (p $_{e,c}$ − p $_{2}$)/K $_{p}$ including circumferential bending stiffness of the tube K $_{p}$. ISSN 13198025 Age Range 18 to 22 years ♦ above 22 year Educational Use Research Education Level UG and PG Learning Resource Type Article Publisher Date 2011-01-15 Publisher Place Berlin, Heidelberg e-ISSN 21914281 Journal Arabian Journal for Science and Engineering Volume Number 36 Issue Number 2 Page Count 10 Starting Page 329 Ending Page 338