Abstract
Non-Newtonian pseudo plastic liquid flow through different types of 0.0127 m diameter pipe bends as well as straight pipe have been investigated experimentally to evaluate frictional pressure drop across the bends in laminar and water flow in turbulent condition. We have studied here the effect of flow rate, bend angle, fluid behavior on static pressure and pressure drop. A Computational Fluid Dynamics (CFD) based software is used to predict the static pressure, pressure drop, shear stress, shear strain, flow structure, friction factor, loss co- efficient inside the bends for Sodium Carboxy Methyl Cellulose (SCMC) solution as a non-Newtonian pseudo plastic fluids and water as a Newtonian fluid. Laminar Non-Newtonian pseudo plastic Power law model is used for SCMC solution to numerically solve the continuity and the momentum equations. The experimental data are compared with the CFD generated data and is well matched. The software predicted data may be used to solve any industrial problem and also to design various equipment.
Highlights
Non-Newtonian pseudo plastic fluid flow through bends are more complicated compared to the simple straight pipe as the bends are associated with different curve geometry
We have considered Dean Number (De) to explain the flow phenomena inside the bends
4.4 Boundary conditions The continuity and momentum equations are solved subject to the following boundary conditions: (a) Assuming bend walls are rigid and no slip conditions are introduced. (b) Velocity is considered as inlet parameter and (c) The outlet is the pressure of the fluid at the end of the pipe
Summary
Non-Newtonian pseudo plastic fluid flow through bends are more complicated compared to the simple straight pipe as the bends are associated with different curve geometry. CFD analysis of non-Newtonian pseudo plastic flow through bends is important as it may be used as a complement to an experiment and to lower the time and experimental cost of equipment. It gives us the conceptual studies of new design, redesign, detailed product development, troubleshooting with the help of numerical techniques where mass, momentum, energy, species are involved. The literature available for non-Newtonian pseudo plastic liquid fluid flow through pipe bends are very less. Objective of the work The frictional pressure drop, loss coefficient, shear stress, strain for non-Newtonian liquid flow through different types of bend as piping components are evaluated by the CFD analysis. The apparent or effective viscosity, μeff are defined from Power law model for non-Newtonian fluids as, τ xy
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