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Psychorheology of soft margarines
Štern, Petr ; Pokorný, J. ; Panovská, Z. ; Seifert, P. ; Svoboda, Z. ; Novák, B.
This paper summarises the preliminary results form the research into the influence that conditions of agitation has on the progression of the aggregation process and on some of the properties of formed aggregates affecting the efficiency of separation processes. These results show that the applied velocity gradient G, the period of its action T and the distribution of a velocity field in the agitated volume of water influence the number of aggregates, their size and shape in a significant manner. Smaller and denser aggregates of a homogenous size and more resistant to breaking-up are formed with higher velocity gradient.
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Psychorheology of sun-protected milk
Štern, Petr ; Pokorný, J.
Psychorheology is the relationship between consumer preferences and rheological properties of materials. Sun-protected milks from the point of view of rhelogy are pseudoplastic liquids. All analysed samples show good spreadability and stability by dynamical measurements. Apparent viscosity depended on the temperature and on the pigment concentration.
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Rheology and texture of multiphase emulsion systems
Štern, Petr ; Pokorný, J.
Sensory and texture analyses are important tools to characterise the acceptance of food products by consumers. The aim was to correlate the results of rheological and sensory analysis because they can directly an more easily be applied in production and quality control. As an example were chossen Tartar souces - emulsion of edible oil in an aqueous phase consisting of water, salts, vinegar, modified starch and other flavoring. Functional relations between rheological parameters of tartar souces and sensory characteristics were determined.
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Drag reduction of dense fine-grained suspensions
Vlasák, Pavel ; Chára, Zdeněk ; Štern, Petr
The effect of addition of the sodium carbonate and soda water-glass and their concentration for different kaolin slurry was investigated. The significant decreasing of the apparent viscosity and the yield stress was observed due to the addition of the both peptising agents. The viscosity difference between coagulated and peptised slurries can achieve values of several orders of magnitudes depending on peptising agent concentrations. The modification of physico-chemical environment of the transported slurry can be used also for another fine-grained dense hydro-mixture, e.g. for different mine tailings or for bauxite residue.
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