Blood viscosity measurements using a pressure-scanning capillary viscometer

Sehyun Shin, Do Young Keum, Yun Hee Ku

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


A previously designed capillary viscometer with measuring differential pressure was modified to measure the viscosity of non-Newtonian fluids including unadulterated blood continuously over numerous shear rates in a single measurement. Because of unavoidable experimental noise and a limited number of data, the previous capillary viscometer experienced an inaccuracy and could not directly determine a viscosity without an iterative calculation. However, in the present measurement there are numerous data available near the point of interest so that the numeric value of the derivative, d(ln Q) / d(ln τw), is no longer sensitive to the method of differentiation. In addition, relatively low and wide shear rate viscosity measurements were possible because of the present precision pressure-scanning method with respect to time. For aqueous polymer solutions, excellent agreement was found between the results from the pressure-scanning capillary viscometer and those from a commercially available rotating viscometer. In addition, the pressure-scanning capillary viscometer measured the viscosity of unadulterated whole blood without adding any anticoagulants.

Original languageEnglish
Pages (from-to)1719-1724
Number of pages6
JournalKSME International Journal
Issue number12
Publication statusPublished - 2002 Dec
Externally publishedYes


  • Blood Viscosity
  • Capillary Viscometer
  • Non-Newtonian Fluids
  • Pressure
  • Shear Rates

ASJC Scopus subject areas

  • Mechanical Engineering


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