Abstract
We examine the applicability of three different non-Newtonian constitutive models (power-law, Casson, and Herschel-Bulkley models) to the determination of blood viscosity and yield stress with a scanning capillary-tube rheometer. For a Newtonian fluid (distilled water), all three models produced excellent viscosity results, and the measured values of the yield stress with each model were zero. For unadulterated human blood, the Casson and Herschel-Bulkley models produced much stronger shear-thinning viscosity results than the power-law model. The yield stress values for the human blood obtained with the Casson and Herschel-Bulkley models were 13.8 and 17.5 mPa, respectively. The two models showed a small discrepancy in the yield stress values, but with the current data analysis method for the scanning capillary-tube rheometer, the Casson model seemed to be more suitable in determining the yield stress of blood than the Herschel-Bulkley model.
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This paper was recommended for publication in revised form by Associate Editor Gihun Son
Sangho Kim received his B.S. degree in Mechanical Engineering from Kyung-Pook National University in 1997. He then received his Ph.D. from Drexel University, USA, in 2002. Dr. Kim is currently an Assistant Professor in the Division of Bioengineering and the Department of Surgery at the National University of Singapore in Singapore.
Dohyung Lim received B.S. and M.S. degrees in Biomedical Engineering from Inje University, Kimhae, Korea, in 1998 and 2000, respectively. He then went on to receive his Ph.D. from the School of Biomedical Engineering, Science, & Health Systems, Drexel University, Philadelphia, PA, USA, in 2004. Dr. Lim completed a postdoctoral fellowship in the Department of Physical Therapy and Human Movement Science, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA and was a Research Professor of Biomedical Engineering, Yonsei University, Wonju, Gangwon, Korea. Dr. Lim is currently a Senior Researcher at the Korea Institute of Industrial Technology in Cheonan, Chungnam, Korea.
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Kim, S., Namgung, B., Ong, P.K. et al. Determination of rheological properties of whole blood with a scanning capillary-tube rheometer using constitutive models. J Mech Sci Technol 23, 1718–1726 (2009). https://doi.org/10.1007/s12206-009-0420-6
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DOI: https://doi.org/10.1007/s12206-009-0420-6