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Rectification on the inertial effects for co-axial cylinders rheometer
1Department of Physics, The Forth Military Medical University, Xi'an, China.
Clinical Hemorheology and Microcirculation
|January 5, 1999
Summary
Inertia significantly affects non-Newtonian fluid flow in rheometers. A new method corrects for these effects, showing fluid inertia is negligible in small gaps, while cylinder inertia follows a vibration equation.
Area of Science:
- Rheology
- Fluid Dynamics
- Biophysics
Background:
- Inertia of both the fluid and inner cylinder impacts unsteady non-Newtonian fluid flow measurements in co-axial cylinder rheometers.
- Accurate rheological characterization requires understanding and mitigating these inertial effects.
Purpose of the Study:
- To investigate the influence of inertia on unsteady non-Newtonian fluid flow within a co-axial cylinder rheometer.
- To propose a method for correcting measured results affected by inertial phenomena.
Main Methods:
- Detailed study of inertial effects in co-axial cylinder rheometry.
- Development of a correction method for unsteady flow measurements.
- Modeling the inner cylinder's inertia using a vibration equation.
Main Results:
- Fluid inertia can be disregarded when the gap between cylinders is small.
- The inertia of the inner cylinder can be accurately represented by a vibration equation.
- Observed changes in Huang's blood constitutive parameters using the derived equation.
Conclusions:
- Inertial effects are crucial in rheological measurements of non-Newtonian fluids.
- The proposed correction method enhances the accuracy of rheometer data.
- The study provides a framework for analyzing inertial influences on fluid constitutive parameters.