Rheological analysis of water clay compositions in order to investigate mudflows developing in canals
AUTOR(ES)
Maciel, Geraldo de F., Santos, Hamilton Kiryu dos, Ferreira, Fabiana de O.
FONTE
Journal of the Brazilian Society of Mechanical Sciences and Engineering
DATA DE PUBLICAÇÃO
2009-03
RESUMO
This paper describes the physical and rheological property mixtures of water and kaolinitic clay that form the interstitial fluid found in muds from inundations or torrential lava. Several compositions with varying volume concentrations (Cv) were tested in a high-precision R/S rheometer (shear rate x shear stress). The rheometric parameters such as critical stress, apparent viscosity and outflow curves were established. A detailed analysis of the possible thixotropic fluid (shear thinning) and preparation of the mixtures were carried out. Such mud-type mixtures were well adjusted to the Herschel-Bulkley rheologic model at 03 parameters namely τ =τ=τc + Kγn , where τ is the shear stress; τc the yield stress (or initial rigidity); k is the consistency term; n the flow index; and γ= du dy the deformation rate or shear rates. Considering that this is a thorough research that seeks to infer laws of friction on a canal taking into account the non-Newtonian rheology of the flowing material, it is observed that the tested mixturesspecifically keep away from the Newton model, though less for the Bingham model, and adjusted well to the Herschel-Bulkley model, especially for lower deformation rates. Finally, from a refined literature review on the subject, it was appropriate to describe in detail a wider range of deformation rates and overall behavior laws of the various parameters of the Herschel Bulkley as a function of the concentration by volume (Cv).
Documentos Relacionados
- Rheological properties and hydration of ternary cements containing clay brick, clay tile, marble, and phosphogypsum waste
- Rheological properties and curing features of natural rubber compositions filled with fluoromica ME 100
- Influence of Ca2+ in the rheological properties and filtration of bentonitic clay dispersions in aqueous drilling fluids
- Influence of clay surfactants polarity on the crystallization and rheological behavior of nanocomposites of PDLLA
- Targeting Appropriate Interventions to Minimize Deterioration of Drinking-water Quality in Developing Countries