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FLOW DISTURBANCES IN GLASS MODELS OF ANEURYSMS AT LOW REYNOLDS NUMBERS
Author(s) -
Stehbens W. E.
Publication year - 1974
Publication title -
quarterly journal of experimental physiology and cognate medical sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.925
H-Index - 101
eISSN - 1469-445X
pISSN - 0033-5541
DOI - 10.1113/expphysiol.1974.sp002256
Subject(s) - reynolds number , turbulence , mechanics , aneurysm , tube (container) , deflection (physics) , materials science , laminar flow , physics , optics , composite material , medicine , surgery
Flow in glass models, simulating fusiform, cylindrical, spherical and lateral saccular aneurysms, was examined by experimentation using the dye injection technique. Aneurysmal dilatations on straight tubes did not induce turbulence at Reynolds numbers below the critical level for turbulence in a straight tube (2000). A lateral aneurysm associated with a deflection of the distal tube (20°) induced turbulence distal to the aneurysm at a Reynolds number of 1100. In all models, waves in the dye within the aneurysm and in the parent tube immediately distal to the aneurysm were observed at Reynolds numbers considerably below critical levels for turbulence. This wave motion, due to oscillations of the dye filaments at the junction of the tube and the distal end of the aneurysm, is possibly a jet edge phenomenon.