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1

Effects of commercial modifiers on flow properties of hydrophobized limestone powders

100%

Vogt E.

Polish Journal of Environmental Studies

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2013

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tom 22

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nr 4

Limestone powder popularly used as an anti-explosive agent in the mining industry and as an absorbent for exhaust fume desulphurization in the energy industry, both of which take advantage of the powder’s, favourable flow properties. In this project, evaluations of the influence of commercial modifiers on the flow properties of hydrophobized limestone powders were measured. The analysis was carried out on the basis of densimetric measurements with the use of a powder characteristics tester. It was stated that the hydrophobization process improves not only the waterproof properties of limestone powders, but also reduces cohesion and improves flow properties.

2

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Application of vane impeller for assessment of rheological properties of poultry liver pate

86%

Dajnowiec F., Zander L.

Acta Agrophysica

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2009

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tom 13

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nr 1[166]

Rheological properties of market-available liver paté spreads were investigated using a vane impeller (d = 20.5 mm, h = 41.6 mm) and the drive system of a rotational rheometer Rheotest RV2. The measurement of the shear stress σ, developed on the walls of the cylinder, formed by the vane rotation, enabled evaluation of the static yield stress σy and flow curves of the samples tested. The measurements were carried out at temperatures of 10, 15, 20 and 50°C. The spreads tested displayed variable water content over the range of 65.0-69.7 g (100 g)ˉ¹ and fat content from 10.7 to 20.6 g (100 g)ˉ¹. Static yield stress value σy of the samples varied from 45 to 130 Pa and depended upon the sample and temperature. The flow curves were typical for shear-thinned fluid possessing yield stress, and suggested good agreement with the concept of so-called ideal spread. This term means a material possessing yield stress sufficient to keep its shape under its own weight while simultaneously displaying relatively low apparent viscosity. Over a wide range of shear rates γ the relationship σ(γ) was linear and for its approximation the Bingham equation could be applied. The experiments have shown significant viscosity differentiation between the spreads obtained by various manufacturers, and applicability of the vane impeller for spreadability evaluations.

3

Factors affecting the flowability of fertilizers through orifices

72%

Kara M., Hofstee J. W.

International Agrophysics

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2000

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tom 14

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nr 1

4

Flow property study of corn starch after addition of hemicelluloses from buckwheat hulls

72%

Burisova A., Hromadkova Z., Ebringerova A., Stadlerova K., Dandar A.

Żywność Nauka Technologia Jakość. Suplement

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2002

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tom 09

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nr 4

Buckwheat seeds are an important pseudocereal used as flour in baking industry. Also hulls, a waste material produced in the de-hulling process is of certain interest. Hemicelluloses were isolated from buckwheat hulls. They were characterised and shown to be of the glucuronoxylan type. Their effect upon rheological properties of gels of corn starch with varying amount of hemicelluloses (0.3%; 0.5%; 0.7% and 1.0%) is described. The rheological properties of the blends were investigated using the Brabender viscograph and Rheotest 2 viscograph. At the same pasting temperature, pastes containing an optimum of hemicelluloses (0.5-0.7%), exhibited the highest viscosity and stability against mechanical stress. At this optimum concentration, hemicelluloses increased substantially the apparent viscosity of the pastes at low and high shear rates and this trend was observed also with increase in temperature. Effect of the hemicellulose addition to corn starch on retrogradation of the pastes was studied in the refrigeration as well freeze-thaw processes. A minimum addition of hemicelluloses (0.3%) significantly affected the syneresis of starch.

Ograniczanie wyników

1 Acta Agrophysica

1 International Agrophysics

1 Polish Journal of Environmental Studies

1 Żywność Nauka Technologia Jakość. Suplement

1 Burisova A.

1 Dajnowiec F.

1 Dandar A.

1 Ebringerova A.

1 Hofstee J. W.

1 Hromadkova Z.

1 Kara M.

1 Stadlerova K.

1 Vogt E.

1 Zander L.

1 2013

1 2009

1 2002

1 2000

Effects of commercial modifiers on flow properties of hydrophobized limestone powders

Application of vane impeller for assessment of rheological properties of poultry liver pate

Factors affecting the flowability of fertilizers through orifices

Flow property study of corn starch after addition of hemicelluloses from buckwheat hulls