Challenges and solutions in Rheometry: Special emphasis on high shear rate applications
High shear applications are relevant in various industries such as paint and coatings, lubricants but also polymer processing as well as in healthcare and medical science. Typical processes in which high shear applications are of importance are spraying and coating, extruding but also injecting or rubbing. The proper rheological characterization of materials at high shear rates still remains a challenge in modern rheometry with rotational rheometer. At high-shear rates, disturbance effects as derived from radial migration, secondary flows due to sample inertia or viscous heating due to dissipation of shear energy in frictional heating may lead to a misinterpretation of the rheological properties of the sample. This webinar focus on typical disturbance effects that may play a huge role when using a rotational rheometer at shear rates well above 103 1/s. Commercially available solutions with application examples are presented in the first part of the webinar. In the second part, other novel solutions with particular emphasis on high shear rheometry are introduced. They include a modified narrow-gap rheometer able to access shear rates above 105 1/s at gaps down to 20 µm.
Prof. Dr. Andreas Wierschem is professor for High Pressure Thermofluiddynamics and Rheology at the University of Erlangen-Nuremberg. After studying physics at the University of Münster, he joined the Instituto Pluridisciplinar, Madrid for his PhD studies on nonlinear dynamics during absorption. He habilitated in fluid mechanics on film flows at the University of Bayreuth. During his career, he stayed at various research institutions in Europe. His interest included from particle hydrodynamics to the rheology of soft matters and biomaterials. For more than ten years, Prof. Wierschem has been working on the design of a narrow gap rheometer capable of measuring at high shear rates.
Dr. José Rodriguez Agudo works as application scientist in rheology and dynamic mechanical analysis (DMA) for Anton Paar Germany GmbH. His responsibilities include the scientific support of customers and the development of new applications in rheology/DMA. He studied process engineering at the University of Seville (Spain) and at the Karlsruhe Institute of Technology (KIT) and received his PhD in the field of rheometry from the Institute of Fluid Mechanics at the University of Erlangen. After his PhD he worked for four years at the Campus of the University of Erlangen in Busan (South Korea), where he further specialized in experimental fluid mechanics and rheometry.
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