Journal of Mechanical Science and Technology

The Korean Society of Mechanical Engineers (대한기계학회)
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Blood Viscosity Measurements Using a Pressure-Scanning Capillary Viscometer

  • Sehyun Shin (School of Mechanical Engineering, Kyungpook National University) ;
  • Keum, Do-Young (School of Mechanical Engineering, Kyungpook National University) ;
  • Ku, Yun-Hee (School of Mechanical Engineering, Kyungpook National University)
  • Published : 2002.12.01
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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(In Q)/d(In Q$\sub$w/), 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.

Keywords

References

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