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National Repository of Grey Literature 3 records found  Search took 0.01 seconds. 
Non-Newtonian liquids : determination of a value of viscosity characterising the initial newtonian plateau
 David, Jiří ; Filip, Petr
The present contribution indicates that precisely the same situation - as with the determination of the so-called yield stress of viscoplastic materials - concerns also the value of viscosity describing the initial Newtonian plateau. It is shown that the determination of this value from the experimental data is not unique, significantly subjects to the range of measured parameters, and the proper determination of the precise value is very questionable.
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K empirickému modelování "nespojitých" experimentálních tokových křivek
 David, Jiří ; Filip, Petr
Frequently used classical empirical rheological models describin course of flow curves viscosity vs. shear rate exhibit monotonous behaviour - of either shear thinning or shear thickening nature. For description of behaviour where participation of both increasing and decreasing parts takes place there is a necessity of application of new empirical models
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K výběru odpovídajícího fenomenologického modelu pro vazkoplastické kapaliny
 David, Jiří ; Filip, Petr
At present a series of phenomenological models are used for the description of flow curves of viscoplastic materials. Their application for the given materials hitherto subjects to the two following factors: number of entering parameters and agreement with the experimental data. However, for the case of viscoplastic fluids there is still one point playing a crucial role: determination whether a mutual ratio of ciscous and plastic effects generated by the proposed model corresponds to the physical characteristics of the material studied. This contribution aims to analyse partially this topic and to provide a hint for a choice of a corresponding model
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