The superposition of steady on oscillatory shear and its effect on the viscoelasticity of human blood and a blood-like model fluid |
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| Institution: | 2. Institute for Medical Physics and Biophysics, University Hospital Charité, Humboldt University, Berlin, Germany;3. L.U.M. GmbH, Berlin, Germany;1. Department of Continuum Mechanics and Structural Analysis, University Carlos III of Madrid, Avda. de la Universidad, 30, 28911 Leganés, Madrid, Spain;2. Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;1. St Vincent''s Clinic, Sydney, Australia;2. University of New South Wales, Sydney, Australia;3. Victor Chang Cardiac Research Institute, Sydney, Australia;4. Department of Biomedical Engineering, FMHS, Macquarie University, Sydney, Australia;5. Department of Cardiovascular Medicine, University of Florida, Gainesville, USA;6. 1st Department of Cardiology, University of Athens Medical School, Athens, Greece;7. Health Sciences and Technology, MIT, Cambridge, USA;8. Harvard Medical School, MIT, Cambridge, USA;1. Università degli Studi di Firenze, Dipartimento di Matematica e Informatica \"U. Dini\", Firenze, Italy;2. FIAB SpA, Firenze, Italy;3. Dipartimento di Scienze Anatomiche, Università degli Studi “Sapienza\", Roma, Italy;1. School of Engineering and Materials Science, Queen Mary University of London, London, UK;2. Parks College of Engineering, Aviation and Technology, Saint Louis University, St. Louis, MO, 63103 USA;3. Tianjin Jinhang Computing Technology Research Institute, Tianjin 300308, China;1. School of Chemical and Environmental Engineering, Yangtze University, Jingzhou, 434023, PR China;2. Technology & Engineering Research Institute CCDC, CNPC, Xi´an, 710018, PR China;3. Changqing Downhole Technology Operation Company, CNPC Chuanqing Drilling Engineering Company, Xi´an, 710018, PR China;1. Department of Applied Geology, Georg-August-Universität Göttingen, Goldschmidtstrasse 3, Göttingen and 37077, Germany;2. Institute of Forestry and Environmental Sciences, University of Chittagong, Chittagong and 4331, Bangladesh |
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| Abstract: | To understand the pulsatility of human blood flow in vivo, it is necessary to separately investigate (1) steady shear and oscillatory flow, and (2) the superposition of steady shear flow on oscillatory flow performed under in vitro conditions. In this study a variable steady shear rate was superimposed in parallel on oscillatory shear at a constant frequency (0.5 Hz) for human blood (45% hematocrit), and an aqueous polyacrylamide polymer solution (AP 30E, concentration 300 ppm). The effect of superposition of the above two shear flows on the viscoelasticity of blood was more pronounced for the elastic (η′') than for the viscous (η′) component of viscoelasticity. With increasing superimposed shear rate, both η′ and η′' decreased, especially at the low shear region. This behavior can be explained by the viscoelastic properties of blood and the phenomena of blood aggregation and disaggregation. Quantitatively, the dependence of the viscous component of complex viscosity on superimposed shear for both blood and polymer solution is described by a modified Carreau equation. The elastic component of complex viscosity decreased exponentially with increasing superimposed shear, and it is described by an exponential model. © 1997 Elsevier Science Ltd |
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