A Practical Approach to Rheology and Rheometry by Gebhard Schramm PDF

A Practical Approach to Rheology and Rheometry by Gebhard Schramm PDF

By Gebhard Schramm

"It is was hoping that this booklet, in attempting to provide easy motives for sometimes complicated phenomena and giving suggestion on 'what to do and what to not do', can set off readers to realize an perception right into a box that's scientifically and technically attention-grabbing and commercially rewarding."

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Absolute rheometry data can be compared easily between laboratories worldwide. They are an accepted common basis in discussions between suppliers and users related to the rheological behavior of semi-solids and all visco-elastic fluids. 35 Rheology 3. 1 Comparing the different design principles The principle of rotational rheometers with coaxial cylinder-, cone-and-plateand parallel-plate sensor systems allows the design of excellent and versatile absolute rheometers. The range of rotational rheometers and viscometers on the world market varies widely in sophistication and price.

0174 rad (1°). The following point should also be considered: Large errors of measurement data are encountered if the contact between the cone and the plate is neither well set nor maintained and a resonable control of the sample temperature is lost when the sample is subjected to high shear. 5 Comparison of coaxial cylinder- and of cone-and-platesensor systems Both types of sensor systems give in theory identical test results for homogeneous Newtonian and non-Newtonian liquids. Still there are some differences in the applications of these sensor systems worth noting: Generally, one cannot go wrong choosing coaxial cylinder sensor systems.

Flow curves provided by such a viscometer for fluids characterized by a yield value show only a small angle deviation from the vertical for stresses below the yield value. This angle is again related partly to the spring factor but it is also influenced by some creep deformation of the fluid placed into the sensor system. CS-rheometers can measure accurately at and around the yield value and their design gives them the potential to determine yield values much more accurately than is possible with the CR-rheometers with spring type stress sensors and a rotor speed measurement by means of the tachometer/generator.

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A Practical Approach to Rheology and Rheometry by Gebhard Schramm

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