A method of isolating surface tension and yield stress effects in a U-shaped scanning capillary-tube viscometer using a Casson model
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- 作者：Kim ; Sangho ; Cho ; Young I. ; Hogenauer ; William N. ; Kensey ; Kenneth R.
- 关键词：U-shaped capillary-tube viscometer ; Surface tension ; Yield stress ; Blood ; Viscosity
- 刊名：Journal of Non-Newtonian Fluid Mechanics
- 出版年：2002
- 出版时间：March 25, 2002
- 年：2002
- 卷：103
- 期：2-3
- 页码：205-219
- 全文大小：138 K
文摘
The present study introduces a method to consider different surface tensions at two riser tubes for the viscosity measurements of fluids using a U-shaped scanning capillary-tube viscometer (SCTV). The accuracy and repeatability of the SCTV were demonstrated by comparing the viscosity results of distilled water obtained from the SCTV with the well-accepted reference data for water. Non-Newtonian viscosities of bovine blood containing 7.5 % ethylenediaminetetraacetic acid (EDTA) and fresh human blood were measured at 25°C and at a body temperature of 37°C, respectively. The viscosity results for bovine blood gave excellent agreement with the results obtained from a rotating viscometer. The results demonstrate that whole blood viscosity can be measured over a range of shear-rates in less than 2–3min without any anticoagulants using disposable U-shaped capillary-tube sets.