Theoretical study of the flow of cement raw material sludge through pipes

Abstract

Abstract The flow of fluids through pipes directly depends on the physicomechanical characteristics of the material. When designing technological equipment, it is assumed that the equipment operates with the limiting physical characteristics of the liquid. The study of the flow of non-Newtonian fluids is important for the development of energy-saving methods for the cement industry. In this paper, we study the flow of cement raw sludge through rigid pipes. It is shown that when moving in pipes near the pipe walls, the sludge moves like a normal Newtonian liquid, and near the pipe it moves like a solid. This indicates that when moving through a pipe with a prolonged non-stationary effect, the sludge behaves like a normal Bingham body. The article found the flow rate, the drag coefficient, the Reynolds number, and the hydraulic resistance when the sludge moves through the pipe. In this paper, the parametric law of resistance of sludge movement in pipes is defined, which can be considered as a convenient way to calculate pressure drop. It follows from the law that, when flowing through pipes, sludge now acquires the properties of a plastic body and behaves like Bingham plastic.