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Related Concept Videos

Viscosity of Fluid01:19

Viscosity of Fluid

Viscosity measures the resistance a fluid offers to flow and deformation. It results from internal friction between layers of fluid moving relative to one another. Dynamic viscosity, denoted by the Greek letter mu (μ), quantifies the force needed to move one fluid layer over another. For Newtonian fluids like water and air, the relationship between the shearing stress and the rate of shearing strain is linear, meaning their viscosity remains constant regardless of the applied stress.
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Updated: Jun 8, 2026

Micro-particle Image Velocimetry for Velocity Profile Measurements of Micro Blood Flows
07:53

Micro-particle Image Velocimetry for Velocity Profile Measurements of Micro Blood Flows

Published on: April 25, 2013

A highly accurate and consistent microfluidic viscometer for continuous blood viscosity measurement.

Yang Jun Kang1, Sang Youl Yoon, Kyeong-Hwan Lee

  • 1School of Mechatronics, Gwangju Institute of Science and Technology, Buk-gu, Gwangju, Republic of Korea.

Artificial Organs
|October 16, 2010
PubMed
Summary

A novel microfluidic viscometer precisely measures fluid viscosity using a 100-channel array. This device accurately quantifies both Newtonian and non-Newtonian fluid viscosity, offering real-time monitoring capabilities.

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Area of Science:

  • Microfluidics
  • Fluid Dynamics
  • Biomedical Engineering

Background:

  • Viscosity measurement is crucial in various scientific and medical applications.
  • Conventional viscometers can be complex and time-consuming.
  • There is a need for high-precision, real-time viscosity monitoring devices.

Purpose of the Study:

  • To develop and demonstrate a high-precision microfluidic viscometer.
  • To validate the accuracy of the microfluidic viscometer for both Newtonian and non-Newtonian fluids.
  • To explore potential clinical applications of the developed viscometer.

Main Methods:

  • Utilized a microfluidic channel array with 100 indicating channels.
  • Employed lumped parameter modeling to derive an analytical solution for relative viscosity.
  • Compared measurements with a conventional viscometer for Newtonian (SDS solution) and non-Newtonian (whole blood) fluids.

Main Results:

  • Achieved normalized viscosity differences less than 2.5% for Newtonian fluids.
  • Demonstrated normalized differences in power-law parameters (k and n) less than 2% for non-Newtonian fluids.
  • Confirmed high accuracy and continuous, near real-time measurement capabilities.

Conclusions:

  • The developed microfluidic viscometer accurately measures viscosity of Newtonian and non-Newtonian fluids.
  • The device offers continuous and near real-time monitoring.
  • Potential applications include monitoring viscosity in cardiopulmonary bypass procedures.