What is the Rheometer Theory?
Manufacturers employing such materials as plastics and rubber endeavor to control the quality of the raw materials that they use and of the products that they produce. The rheometer is very serviceable for this purpose.
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Types of Rheometers
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The orthogonal rheometer consists of two parallel horizontal plates, each of which rotates about an axis that is perpendicular to the planes of the two plates. The two plates do not have the same axis. The balance rheometer consists of two spheres that have the same center.
Operation of Rheometers
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The fluid to be tested enters the area between the plates of an orthogonal rheometer. The plates rotate or oscillate at the same speed. Since they each rotate about a different axis, their rotation applies stress to the fluid and causes it to deform. The balance rheometer operates on a similar principle. The two concentric circles have two different axes, each of which passes through the center of the sphere. They rotate at the same speed, deforming the fluid.
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Theory of Rheometers
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Instruments measure the degree of deformation, and mathematical equations are available to analyze the results. The action of the rheometer will show whether the fluid has the correct viscosity or thickness for the product under consideration. It will also show whether the fluid has a constant density or mass per unit volume. A fluid will have a constant density if there are no imperfections or impurities. So a constant density means that the fluid under consideration is good quality material.
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References
- Springerlink---Journal of Central South University of Technology: Something Old, Something New, in Rheometry
- IOP Science: A Theory for the Balance Rheometer
- Cambridge Journals: Rheometrical flow systems Part 2
- Springerlink---Archive for Rational Mechanics and Analysis: On the Flow of a Simple Fluid in an orthogonal rheometer
- "Serway's College Physics;" Jerry S. Faughn, Raymond A. Serway, Chris Vuille and Charles A. Bennett; 2006
