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Related Concept Videos

Newtonian Fluid: Problem Solving01:18

Newtonian Fluid: Problem Solving

183
Newtonian fluids exhibit a constant viscosity, meaning their shear stress and shear strain rate are directly proportional. This property ensures a predictable and stable response to applied forces, maintaining a linear relationship between force and flow. Examples include water, air, and light oils, consistently demonstrating this proportional behavior regardless of external conditions.
A velocity gradient forms within the fluid when a Newtonian fluid is placed between two parallel plates, with...
183

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Micro-particle Image Velocimetry for Velocity Profile Measurements of Micro Blood Flows
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Development of a Microfluidic Viscometer for Non-Newtonian Blood Analog Fluid Analysis.

Yii-Nuoh Chang1, Da-Jeng Yao1,2

  • 1Institute of NanoEngineering and MicroSystems, National Tsing Hua University, Hsinchu City 300, Taiwan.

Bioengineering (Basel, Switzerland)
|January 8, 2025
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Summary

A new microfluidic platform precisely measures blood viscosity during pulsatile flow, aiding early stroke detection. This innovation enhances stroke risk assessment by capturing critical low shear rate viscosity variations.

Keywords:
blood behavior flowmicrofluidic devicenon-Newtonian fluid

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Area of Science:

  • Biomedical Engineering
  • Cardiovascular Research
  • Fluid Dynamics

Background:

  • Global stroke incidence is increasing, necessitating improved early warning and prevention strategies.
  • Monitoring blood viscosity is crucial for stroke risk assessment, but current methods lack precision at low shear rates typical of pulsatile flow.
  • Existing techniques fail to accurately capture the non-Newtonian behavior of blood under dynamic flow conditions.

Purpose of the Study:

  • To develop and validate a novel microfluidic platform for precise blood viscosity measurement during pulsatile flow.
  • To differentiate and evaluate systolic blood viscosity (SBV) and diastolic blood viscosity (DBV).
  • To address the limitations of current viscometry methods in simulating physiological pulsatility.

Main Methods:

  • A microfluidic platform with a specialized microarray was designed to simulate pulsatile blood flow.
  • The system measures blood viscosity at low shear rates (<100 s⁻¹) characteristic of pulsatility.
  • The non-Newtonian blood behavior was analyzed across specific shear rate conditions.

Main Results:

  • The microfluidic platform achieved 95% accuracy and excellent reproducibility compared to traditional viscometers.
  • The system accurately captured blood viscosity variations within the physiological range of 1-10 cP.
  • Systolic and diastolic blood viscosity could be differentiated and evaluated.

Conclusions:

  • The novel microfluidic platform offers precise blood viscosity measurements under pulsatile flow conditions.
  • This technology can significantly enhance the accuracy of stroke risk prediction models.
  • The system represents a promising advancement for cardiovascular monitoring and stroke prevention efforts.