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Blood viscosity measurements using a pressure-scanning capillary viscometer

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Abstract

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(lnQ)/dln τω), 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.

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Abbreviations

L:

Length (m)

P:

Pressure (Pa)

Q:

Volume flow rate (m3/s)

t:

Time (s)

V:

Volume (m3)

v:

Velocity (m/s)

p :

Density (kg/m3)

φ :

Diameter (m)

γ :

Shear rate (s-1)

η :

Non-Newtonian viscosity (Pa-s)

τ :

Shear stress (Pa)

A:

Atomospheric condition

C:

Capillary tube

h:

Head

i:

Initial

w:

Wall

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Authors and Affiliations

  1. School of Mechanical Engineering, Kyungpook National University, 1370 Sankyuk-dong, 702-701, Buk-gu Daegu, Korea

    Sehyun Shin, Do-Young Keum & Yun Hee Ku

Authors
  1. Sehyun Shin
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  2. Do-Young Keum
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  3. Yun Hee Ku
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Correspondence to Sehyun Shin.

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Shin, S., Keum, DY. & Ku, Y.H. Blood viscosity measurements using a pressure-scanning capillary viscometer. KSME International Journal 16, 1719–1724 (2002). https://doi.org/10.1007/BF03021674

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  • DOI: https://doi.org/10.1007/BF03021674

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