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Related Concept Videos

Newtonian Fluid: Problem Solving01:18

Newtonian Fluid: Problem Solving

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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...
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Viscosity of Fluid01:19

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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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Related Experiment Video

Updated: Feb 28, 2026

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A Microfluidic Platform for Viscosity Testing of Non-Newtonian Fluids in Engineering and Biomedical Applications.

Yii-Nuoh Chang1, Da-Jeng Yao1,2

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

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|February 27, 2026
PubMed
Summary

This study introduces a microfluidic device for measuring non-Newtonian fluid viscosity up to 50 cP. The enhanced platform uses a flow stabilizer for high-precision, low-volume rheometry in various applications.

Keywords:
dairy gelationmicrofluidic chipnon-Newtonian fluidsviscosity measurement

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Area of Science:

  • Fluid Dynamics
  • Materials Science
  • Biomedical Engineering

Background:

  • Microfluidic devices offer precise fluid handling for viscosity measurements.
  • Traditional methods face limitations in measuring non-Newtonian fluids across a wide viscosity range.
  • Extending the measurable viscosity range is crucial for applications in food science and biomedical diagnostics.

Purpose of the Study:

  • To develop and validate a microfluidic platform for non-Newtonian fluid viscosity sensing.
  • To extend the measurable viscosity range from 1-10 cP to 1-50 cP.
  • To integrate a high-flow-rate flow field stabilizer to improve accuracy at elevated flow rates.

Main Methods:

  • Utilized a dual-phase laminar flow principle based on channel occupancy for relative viscosity determination.
  • Employed computational fluid dynamics (CFD) simulations to design and optimize a flow stabilizer.
  • Validated the microfluidic system using simulated blood and dairy samples, comparing results with conventional viscometers.

Main Results:

  • The optimized N5 flow stabilizer design reduced velocity distribution asymmetry by over 50% in high-flow simulations.
  • The microfluidic platform achieved over 95% viscosity accuracy with less than 5% sample volume error.
  • Successfully monitored viscosity changes during milk acidification and gelation, showing excellent agreement with standard measurements.

Conclusions:

  • The developed microfluidic platform significantly enhances rheometry capabilities for non-Newtonian fluids.
  • The integrated flow stabilizer enables high-precision viscosity measurements across an extended range (1-50 cP).
  • This technology holds significant potential for applications in food engineering, biomedical diagnostics, and industrial fluid monitoring.