Model-Independent Relationships between Hematocrit, Blood Viscosity, and Yield Stress Derived from Couette Viscometry Data

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• 作者：Y. Leong Yeow ; S. Ranil Wickramasinghe ; Yee-Kwong Leong ; and Binbing Han
• 刊名：Biotechnology Progress
• 出版年：2002
• 出版时间：October 2002
• 年：2002
• 卷：18
• 期：5
• 页码：1068 - 1075
• 全文大小：219K
• 年卷期：v.18,no.5(October 2002)
• ISSN：1520-6033

文摘

This paper describes a procedure, based on Tikhonov regularization, for obtaining theshear rate function or equivalently the viscosity function of blood from Couetteviscometry data. For data sets that include points where the sample in the annulusis partially sheared the yield stress of blood will also be obtained. For data sets thatdo not contain partially sheared points, provided the shear stress is sufficiently low,a different method of estimating the yield stress is proposed. Both the shear ratefunction and yield stress obtained in this investigation are independent of anyrheological model of blood. This procedure is applied to a large set of Couette viscometerdata taken from the literature. Results in the form of shear rate and viscosity functionsand yield stress are presented for a wide range of hematocrits and are compared againstthose reported by the originators of the data and against independently measuredshear properties of blood.