A wide range of materials encountered in our everyday life, such as clay suspensions, foams, concentrated emulsions, cement pastes, paints, glues, purees, creams, can flow like simple liquids under certain conditions and behave like solids under other conditions. This is the specificity of yield stress fluids which makes them so useful in various applications. In their “liquid regime” these mat...

(i) A study of the fluids in simple flow situations, such as those found in Rheometry. (ii) The construction of suitable constitutive equations for the non-Newtonian fluids under test. (iii) The use of these constitutive equations in the prediction of behavior in complex flows of practical importance. (iv) An experimental study of the behavior of non-Newtonian fluids in the complexflow situatio...

This research study deals with the characterization of two-phase flow in a fractured rock mass. A comprehensive mathematical model with which to predict the quantity of each flow component in a single joint is developed. A joint with two parallel walls filled with layers of water and air stratified is analyzed. The effects of mechanical deformation of the joint, the compressibility of fluids, t...

following recent works of several authors like huilgol, bhattacharya etd. and javadpour et al., this paper is to contribute further to the literature of axial flow in a rotational coaxial rheometer. we consider axial flow of herschel bulkley mode1 between two concentric cylinders with the inner one rotating, while the outer cylinder is held stationary. an attempt has been made to direct the ana...