Topic
Rheometer
About: Rheometer is a research topic. Over the lifetime, 5759 publications have been published within this topic receiving 125849 citations.
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TL;DR: In this paper, a rotating type viscometer at 1623 K was used to measure the viscosity of mold flux and shear thinning in continuous casting of steels.
Abstract: There have been consistent efforts on understanding rheological behavior of molten mold flux, used in continuous casting of steels. It is prevalent view that molten mold flux shows non-Newtonian behavior, meaning that the viscosity varies with shear rate history. Hence, the present study attempts to evaluate shear thinning, which is one of the characteristic non-Newtonian behaviors, by measuring its viscosity with a rotating type viscometer at 1623 K. Furthermore, Raman spectroscopy analysis is used to appreciate the structure of molten mold flux and shear thinning. Mold fluxes tested reveal definite shear thinning characteristic of decreasing viscosity with increasing shear rate. The degree of shear thinning has been well quantified by Oswald-De Waele power law model. Lastly, the degree of polymerization, obtained from Raman spectroscopic data has proportional relationship with degree of shear thinning in the range of 1–5 s−1 shear rate. Also, it has a downward parabolic relationship with degree of shear thinning at entire shear rate ranges up to 100 s−1. This study also verifies possibility to use shear thinning behavior on actual continuous casting process.
39 citations
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TL;DR: In this paper, synthesized magnetite nanoparticles were added to a soft-magnetic carbonyl iron (CI)-based magnetorheological (MR) suspensions and its enhanced MR properties were investigated using a rotational rheometer.
39 citations
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TL;DR: In this article, the fundamental properties of six synthetic ester base fluids, suitable for the formulation of environmentally adapted lubricants, have been investigated through experimental measurements with a high pressure Couette rheometer.
39 citations
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TL;DR: In this article, the authors evaluate the interfacial properties of Faba bean (FB) protein as a function of protein concentration and pH value (3.0, 5.0 and 8.0).
39 citations
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TL;DR: A Micro-Electro-Mechanical System (MEMS) based approach for the measurement of dynamic rheology of soft matter where oscillatory strain is produced in a sample sandwiched between an oscillating MEMS stage and a glass plate and the resulting stress-strain relationships are revealed by measurement and analysis of the stage motion.
Abstract: Rheological methods that interrogate nanolitre scale volumes of fluids and solids have advanced considerably over the past decade, yet there remains a need for methods that probe the frequency-dependent complex rheological moduli through application of homogenous strain fields. Here we describe a Micro-Electro-Mechanical System (MEMS) based approach for the measurement of dynamic rheology of soft matter where oscillatory strain is produced in a sample sandwiched between an oscillating MEMS stage and a glass plate. The resulting stress–strain relationships are revealed by measurement and analysis of the stage motion. We present preliminary data on simple viscous fluids and on viscoelastic thin films. In this proof-of-principle device, we measure moduli in the range of 50 Pa to 10 kPa over a range of 3 rad s−1 to 3000 rad s−1 using less than 5 nL of sample material. The device's measurement window is limited primarily by our current ability to measure the motion of the stage. This device will provide a new way to characterize dynamic microrheology of an array of novel materials and will prove useful in a number of areas including biorheology, microfluidics and polymer thin films.
39 citations