A Normal-Force Sensor for Quantitative Normal Stress Measurements

In the application note you can get information such as normal stress difference, terminal, terminal zone, instruments, parallel plate, plate, restoring force, system, measuring system, materials, measurements, and force measurements. Many discussion about pressure, fluid, rheological measurements, normal stress, stress difference, viscosity, published data, steady shear, rheological instrumentation, normal force measurements, and measurement are presented inside the application note.

This application note tells the reader explanation related to performance, sensor, rheology, force acting, flow behavior, shear rates, shear flow, simple shear, laminar flow, rotation, direction, and drop. Below are chosen from the application note:

One of the more important but least utilized aspects of rheology is normal force. It is well known that when a simple liquid such as water is stirred, inertia causes the sample to be displaced away from the axis of rotation. However, when an elastic solution such as polyisobutylene is stirred, it gravitates toward the axis of rotation and creates an inverted vortex. This phenomenon is called rod-climbing or the Weissenberg effect (Figure 1). The effect is due to the generation of normal stress, which acts toward the center of rotation. Normal force is a very sensitive and accurate measurement of the elasticity of a material, and can generate useful information relating the internal structure to the material’s flow behavior. Although there has been much interest in this area, measure ments are encumbered by instrument limitations, especially for lower-viscosity samples.

Furthermore, this application note contains more around elastic fluids, material, boundary layer, parallel plate geometry, force sensor, differential pressure, viscoelastic properties, normal force sensor, drag coefficient, solution, and force.

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