Flow through Venous Cannulae | Zendy

A Selwyn | Zendy; W. J. Russell | Zendy

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Flow through Venous Cannulae

Author(s) -

A Selwyn,

W. J. Russell

Publication year - 1977

Publication title -

anaesthesia and intensive care

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.494

H-Index - 62

eISSN - 1448-0271

pISSN - 0310-057X

DOI - 10.1177/0310057x7700500211

Subject(s) - cannula , medicine , flow (mathematics) , saline , turbulence , viscosity , mechanics , anesthesia , blood flow , surgery , thermodynamics , physics

Fluid flow through modern cannulae is not simple and cannot be expressed in classical terms. Progressively increasing the length of a cannula diminishes flow predictably but altering the bore of the cannula does not give a fourth power improvement in flow but rather a linear one. A reasonable working value for the relative viscosity of ACT) blood in infusions would seem to be 2·6 below about 125 ml/minute flow (saline). The decline in relative viscosity above this may be caused by turbulence in the saline flow.

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