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 article, a controlled stress rheometer was used to determine the creep and recovery behavior of flocculated cement pastes, and the behavior was found to depend on the level of applied stress.
53 citations
TL;DR: In this paper, the rheological and magnetorheological properties of an extremely bidisperse (nano-micro) magnetizable fluid (sample D1) were investigated for comparison with a commercial magnetoric fluid (MRF-140CG; LORD Co. USA) with the same magnetic solid volume fraction, using the Physica MCR-300 rheometer.
53 citations
TL;DR: In this article, a parallel-plate rheometer coupled with a laser backscattering device is proposed to measure the viscosity and the size distribution of cement clusters in cement paste suspension.
53 citations
TL;DR: In this paper, the effects of enzymes (protease and glucose oxidase) and chemical additives (ascorbic acid and potassium bromate) on breadbaking quality were studied.
Abstract: Measuring shear stress relaxation with an established research rheometer after slowly applying large strain proved useful for characterizing the effects of different chemical and enzymatic additives. Baking tests done with and without added ascorbic acid indicated that the method can be used for predicting effects of such additives on breadbaking quality. The relaxation process for dough is discussed in terms of two flow processes, one occurring at short time periods and the other at longer time periods. The slowly applied large strain shear stress relaxation method provides information about stress relaxation behavior during the second flow process. The effects of two enzymes (protease and glucose oxidase) and two chemical additives (ascorbic acid and potassium bromate) were studied. The results are presented as the stress relaxation curve with the corresponding rate plot and the initial value of the stress. Addition of the oxidizing agents increased the second flow process times and decreased t...
53 citations
TL;DR: A new setup was tested for filament breakup experiments using the slow retraction method, high-speed imaging techniques, and an immiscible oil bath to reduce solvent evaporation and facilitate particle tracking in the thinning filament.
Abstract: The characterization of the extensional rheology of polymeric solutions is important in several applications and industrial processes. Filament stretching and capillary breakup rheometers have been developed to characterize the extensional properties of polymeric solutions, mostly for high-viscosity fluids. However, for low concentration polymer solutions, the measurements are difficult using available devices, in terms of the minimum viscosity and relaxation times that can be measured accurately. In addition, when the slow retraction method is used, solvent evaporation can affect the measurements for volatile solvents. In this work, a new setup was tested for filament breakup experiments using the slow retraction method, high-speed imaging techniques, and an immiscible oil bath to reduce solvent evaporation and facilitate particle tracking in the thinning filament. Extensional relaxation times above around 100 μs were measured with the device for dilute and semi-dilute polymer solutions. Particle tracking velocimetry was also used to measure the velocity in the filament and the corresponding elongation rate, and to compare with the values obtained from the measured exponential decay of the filament diameter.
53 citations