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Updated: Aug 9, 2026

Micro-particle Image Velocimetry for Velocity Profile Measurements of Micro Blood Flows
Published on: April 25, 2013
Blood viscosity measurements in both extensional and shear flow by a falling ball viscometer
This study uses a falling ball viscometer to measure blood and plasma viscosity, revealing insights into rheumatoid arthritis patient conditions. The device
Area of Science:
- Rheology
- Biomedical Engineering
- Clinical Diagnostics
Background:
- Blood viscosity is a critical factor in cardiovascular health.
- Understanding blood rheology in inflammatory diseases like rheumatoid arthritis is essential.
Purpose of the Study:
- To utilize a falling ball viscometer for precise measurement of whole blood and plasma viscosity.
- To investigate the relationship between blood viscosity and clinical indicators in rheumatoid arthritis patients.
Main Methods:
- Employing a falling ball viscometer with disposable syringes for viscosity measurements.
- Analyzing the dynamics of a falling sphere to characterize flow fields and deformation rates.
- Calculating Reynolds numbers based on varying velocities and radii.
Main Results:
- The falling ball viscometer effectively measures blood and plasma viscosity.
- Periodic ball movement mitigates sedimentation but not aggregation.
- Two characteristic deformation rates were identified for the mixed extensional and shear flow field.
- Viscosity results correlated with clinical and biological indexes in rheumatoid arthritis patients.
Conclusions:
- The falling ball viscometer is a viable tool for assessing blood rheology.
- Blood and plasma viscosity measurements can provide valuable clinical information for rheumatoid arthritis management.
- Further research into blood aggregation dynamics during viscometry is warranted.
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