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Published on: January 25, 2012
Conception and realization of a new viscometer using a magnetic fluid for measuring biological fluids
Biorheology. Supplement : the Official Journal of the International Society of Biorheology
|January 1, 1984
Summary
A novel magnetic viscometer uses a rotating magnetic field to measure fluid viscosity and transient flow. This innovative apparatus enhances measurement accuracy for various fluids, including blood suspensions.
Area of Science:
- Rheology
- Fluid Dynamics
- Biomaterials
Background:
- Traditional viscometers often measure torque on stationary components.
- Understanding fluid behavior under transient flow conditions is crucial for many applications.
Purpose of the Study:
- To introduce a novel magnetic viscometer design.
- To enable accurate viscosity measurements in transient flow regimes.
- To improve the precision of rheological measurements.
Main Methods:
- A vertical cylinder contains the test fluid with a magnetically responsive inner cylinder.
- A rotating magnetic field drives the inner cylinder, inducing fluid motion.
- Torque is determined by fluid stresses and cylinder inertia, with angular velocity measured on the inner cylinder.
Main Results:
- The viscometer allows for variable torque application to the rotor.
- Angular velocity is measured directly on the inner cylinder, differing from conventional designs.
- Accurate measurements were achieved for Newtonian fluids (water, plasma, oils) and blood suspensions.
Conclusions:
- The developed magnetic viscometer offers a unique approach to fluid characterization.
- Its design facilitates accurate study of transient flow dynamics.
- The apparatus demonstrates improved accuracy for a range of fluid types, including biological suspensions.
