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 mechanically stirred fluid-bed rheometer (msFBR) was used to study the rheology of powders aerated below the fluidisation threshold.
43 citations
TL;DR: In this paper, the rheological behavior of Yankee pineapple juice was examined for the effect of ultraviolet (UV) irradiation (53.42 mJ/cm 2 ) and compared with untreated juice and a thermally pasteurized (80 ǫ c for 10 min) juice.
43 citations
TL;DR: In this paper, the influence of a new processing additive (particles of organically modified nanoclays) on the processibility of polyolefins in extrusion is studied.
Abstract: The influence of a new processing additive (particles of organically modified nanoclays) on the processibility of polyolefins in extrusion is studied. The equipment used includes an Instron capillary rheometer with two types of dies, namely capillary dies and special annular dies (Nokia Maillefer wire coating crosshead) attached to the rheometer. Ziegler Natta and metallocene polyethylenes and one polypropylene were tested using these two pieces of equipment. It was found that the nanoclay additive had a significant effect on the extrudate appearance of polyethylene. It eliminates surface melt fracture and postpones the critical shear rate for the onset of gross melt fracture to significantly higher values depending on resin type, temperature, and additive concentration (typically 0.05 to 0.5 wt%). To explain the possible mechanism for the effect of the additive on the processibility of the resins, shear and extensional rheological measurements were carried out for the pure resins as well those loaded with the nanoclay additives. It seems that the presence of nanoclays suppresses the development of extensional stresses to such high levels that can cause melt fracture phenomena. Finally, it was found that the combination of nanoclays with traditional processing aids such as fluoropolymers produce an enhanced processing aid that can increase the critical shear rates for the onset of melt fracture to levels much higher than the individual constituents when they are used independently. POLYM. ENG. SCI., 45:1098–1107, 2005. © 2005 Society of Plastics Engineers
43 citations
TL;DR: In this article, the yield stress of food materials was determined from the shear stress-shear rate data determined from a narrow-gap viscometer and applying Casson's equation.
Abstract: SUMMARY
The yield stress of food materials plays an important role in their Row characteristics. It is possible to determine the yield stress from the shear stress-shear rate data determined from a narrow-gap viscometer and applying Casson's equation. The yield stress determined in this manner checked with the yield stress determined from the torque exerted on a serrated cylinder at rest.
However, the yield stress for applesauce and tomato puree is much lower with a single-cylinder viscometer than with a narrow-gap viscometer. This is apparently due to disruption of suspension aggregates under shear, with the release of entrapped fluid at the cylinder wall. It is expected that materials in which large amounts of entrapped fluid are released under shear will not exhibit this phenomenon.
The shear stress vs. shear rate data from the narrow-gap viscometer could be fitted by a power-law equation.
43 citations
TL;DR: In this paper, a study of fundamental rheological properties of Traditional Balsamic Vinegar (TBV) was conducted by using a liquid food model system, in which aqueous solutions containing the main chemical constituents of TBV were prepared according to a Central Composite Design (CCD) and flow experiments were conducted using a controlled-strain rotational rheometer.
43 citations