J. Phys. III France
Volume 3, Numéro 6, June 1993
Page(s) 1283 - 1289
DOI: 10.1051/jp3:1993198
J. Phys. III France 3 (1993) 1283-1289

Viscoelastic behaviour of human blood and polyacrylamide model fluids for heart valve testing

Dietmar Lerche1, Georgios Vlastos1, Brigitte Koch1, Manfred Pohl1 and Klaus Affeld2

1  Inst. Med. Phys. Biophysics, Med. Faculty Charité, Humboldt University, 0-1040 Berlin, Germany
2  Biofluid Lab., Virchow Hospital, Free University, Berlin, Germany

(Received 19 October 1992, revised 21 January 1993, accepted 8 March 1993)

New heart valves and other cardiovascular assist systems have to be tested for hydrodynamic performance. In place of human blood simple model fluids like glycerol solutions are employed often due to ethical and practical reasons. But blood exhibits complex non-Newtonian and viscoelastic behaviour. Rheological blood properties are reviewed based on literature and own experimental results. Furthermore we studied polymer solutions with respect to blood-like flow behaviour. Rheology was assessed by means of the low shear rotational viscometer (LS 40, Mettler-Toledo, Switzerland) under stationary and dynamic shear conditions (variation of frequency and angular displacement).

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