Abstract
A viscoplastic fluid flow through an axisymmetric sudden pipe contraction is studied numerically in a laminar regime under non-isothermal conditions. Governing equations are written in terms of stream function – vorticity – temperature variables. A modified Schwedoff -Bingham rheological model is used to describe characteristics of the fluid. The problem is solved by the finite-difference method based on the alternative directions scheme. Simulation of the process involves taking into account viscous dissipation effects and temperature dependence of viscosity. Distributions of flow characteristics and flow structures are shown and compared with those obtained in the case when viscous dissipation is neglected. A local resistance coefficient is calculated and presented as a function of the Brinkman number.
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