Simple conversion of Brookfield R.V.T. readings into viscosity functions

Mitschka, P.

doi:10.1007/bf01736420

Cited by 148 publications

(87 citation statements)

References 5 publications

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“…At each rotational speed, torque and angular velocity data were recorded. The recorded results were then converted into viscosity functions such as shear stress (Pa) and shear rate (1/s) using standard procedure (Mitschka 1982). The linear regression analysis was conducted to determine the plastic viscosity and yield stress as slope and intercept of the regression line drawn through the data points in shear stress versus shear rate plot (Lachemi et al 2004).…”

Section: Measurement Of Rheological Propertiesmentioning

confidence: 99%

Prediction of Concrete Pumping Using Various Rheological Models

Choi

Kim

2014

Int J Concr Struct Mater

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When concrete is being transported through a pipe, the lubrication layer is formed at the interface between concrete and the pipe wall and is the major factor facilitating concrete pumping. A possible mechanism that illustrates to the formation of the layer is the shear-induced particle migration and determining the rheological parameters is a paramount factor to simulate the concrete flow in pipe. In this study, numerical simulations considering various rheological models in the shear-induced particle migration were conducted and compared with 170 m full-scale pumping tests. It was found that the multimodal viscosity model representing concrete as a three-phase suspension consisting of cement paste, sand and gravel can accurately simulate the lubrication layer. Moreover, considering the particle shape effects of concrete constituents with increased intrinsic viscosity can more exactly predict the pipe flow of pumped concrete.

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Section: Measurement Of Rheological Propertiesmentioning

confidence: 99%

Prediction of Concrete Pumping Using Various Rheological Models

Choi

Kim

2014

Int J Concr Struct Mater

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“…After that apparent viscosity and torque data were recorded at each speed (rpm) of spindle. The torque values obtained were converted to the shear stress and the rotational speeds were converted to the shear rates according to the methodology given by Mitschka (1982); Briggs and Steffe (1997) and Windson et al (2009).…”

Section: Measurement Of Rheological Parametersmentioning

confidence: 99%

Effect of storage conditions of egg on rheological properties of liquid whole egg

et al. 2011

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In the present work the effect of storage conditions of egg on rheological properties of Liquid Whole Egg (LWE) prepared from stored eggs were evaluated using a Brookfield. Newtonian model and Ostwald-of-Waele (Power Law) model were fitted to the rheological data obtained by experiments, both represented a good adjustment to the rheological data. The Newtonian model has shown an R 2 value between 0.984 and 0.993 (P<0.05) and 0.991 and 0.995 (P<0.05) for LWE samples prepared from eggs stored at room temperatures and refrigerated temperatures. The Ostwald-of-Waele (Power Law) resulted in the best adjustment, presenting an average R 2 values higher than 0.99 in all the cases and further statistical analysis showed that power law model was appropriate to explain the correct rheological behaviour of LWE prepared from stored eggs. All the LWE samples showed pseudoplastic and thixiotropic behaviour in the experimental conditions.

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“…Spindle #6 was used for all measurements. Since the viscometer did not give direct shear rate and shear stress values for disc-type spindles, shear rate and shear stress values were obtained from the torque-rpm readings by calculation following the procedure described by Mitschka (1982) and Gbosh and Chattopadhyay (2010). The procedure involves taking measurements of many pairs of torques (α i ) with a spindle for fixed values of viscometer speed N i (rpm).…”

Section: Rheological Measurementsmentioning

confidence: 99%

Effects of solid content and temperature on viscosity of tapioca meal

Adebowale

Sanni

2011

J Food Sci Technol

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The effect of solid content (2.5-10%, w/v) and temperature (30-70°C) on the viscosity of tapioca meal from three cassava varieties was investigated in this study. Viscosity measurements were conducted using a digital rotational Brookfield viscometer. The viscosity of tapioca meal increased with increasing solid content and decreasing viscometer speeds. An empirical power-law equation fitted the viscosity data of the tapioca meals with correlation coefficients between 0.94 and 0.99. Our results indicated that tapioca meal can be characterized as a pseudo-plastic fluid and a mean value of 0.32±0.18 was proposed as the power law index of tapioca meal from the three cassava varieties used in this study. Neither solid content, temperature nor shear rate altered the rheological characteristics of tapioca meal.

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Simple conversion of Brookfield R.V.T. readings into viscosity functions

Cited by 148 publications

References 5 publications

Prediction of Concrete Pumping Using Various Rheological Models

Prediction of Concrete Pumping Using Various Rheological Models

Effect of storage conditions of egg on rheological properties of liquid whole egg

Effects of solid content and temperature on viscosity of tapioca meal

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