Determination of the blood viscosity and yield stress with a pressure- scanning capillary hemorheometer using constitutive models

Byung Kwon Lee, Shubin Xue, Jeonghun Nam, Hyunjung Lim, Sehyun Shin

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

We investigated the applicability of two non-Newtonian constitutive models (Casson and Herschel-Bulkley models) in the determination of the blood viscosity and yield stress using a pressure-scanning microfluidic hemorheometer. The present results were compared with the measurements through a precision rheometer (ARES2). For a Newtonian fluid (standard oil), the two constitutive models showed excellent agreement with a reference value and the measurement of ARES2. For human blood as a non-Newtonian fluid, both the Casson and Herschel-Bulkley models exhibited similar viscosity results over a range of shear rates and showed excellent agreement with the ARES2 results. The Herschel-Bulkley model yielded a slightly higher value than other results at low shear rates (γ < 10), which may be due to the relatively high value of the yield stress. The yield stress values for whole blood were 14.4 mPa for the Casson model and 32.5 mPa for the Herschel-Bulkley model, respectively. Thus, the present study showed that the Casson model would be better than the Herschel-Bulkley model for representing the non-Newtonian characteristics of blood viscosity.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalKorea Australia Rheology Journal
Volume23
Issue number1
DOIs
Publication statusPublished - 2011 Mar 1

Fingerprint

Constitutive models
blood
Yield stress
Blood
Viscosity
viscosity
Scanning
scanning
Shear deformation
Fluids
Rheometers
shear
Microfluidics
rheometers
Newtonian fluids
Oils
oils
fluids

Keywords

  • Blood viscosity
  • Capillary viscometer
  • Casson
  • Herschel-bulkley
  • Yield stress

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Materials Science(all)

Cite this

Determination of the blood viscosity and yield stress with a pressure- scanning capillary hemorheometer using constitutive models. / Lee, Byung Kwon; Xue, Shubin; Nam, Jeonghun; Lim, Hyunjung; Shin, Sehyun.

In: Korea Australia Rheology Journal, Vol. 23, No. 1, 01.03.2011, p. 1-6.

Research output: Contribution to journalArticle

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