Experimental study of non-newtonian fluids in conical annular channels

Abstract

Intensive development of chemical technology makes current problems of hydrodynamics flow abnormally viscous fluids in cylindrical annular channels and conical annular channels. Feature of such flows is the need to consider the influence of the flow not only reological properties of the fluid, but also the effect of the inertial forces of the convective acceleration. This article has one of the first attempts to conduct similar investigations of and to obtain views and recommendations on how to calculate the parameters of such flows. In the basis of work the experimental studies to allow a physical simulation of hydrodynamics flow in doubly connected domains with different angles of taper forming surfaces. The article presents the resulting experimental dependence, characterized by a loss of energy in conical annular channels, depending on the rheological properties of model fluids and their offers on the basis of the calculation of the coefficient of hydraulic friction. Are presented according to the coefficient of hydraulic friction λ of the Reynolds number Re for conical annular channels with various law changes the cross-section along its length. Such studies may be useful in the design-governmental equipment for the processing of polymeric materials in the extrusion line.