Numerical study of slip flow heat transfer of non-Newtonian fluids in circular microchannels

摘要

In the present investigation, numerical simulations are performed to study flow and thermal fields of non-Newtonian fluids in circular microchannels. The flow is considered to be slip, axisymmetric, steady, incompressible, laminar, and power law model is used to characterize the behavior of the non-Newtonian fluid. The constant wall heat flux and constant wall temperature are employed as thermal boundary conditions. The set of governing dimensionless differential equations with appropriate boundary conditions are solved together using control volume finite difference method. Results indicate the increasing slip coefficient decreases the product of friction factor and Reynolds number and centerline velocity while results in increasing of local Nusselt numbers. Slip effect enhances with increasing power law index. Also slip effect in constant wall heat flux is more than that of constant wall temperature boundary conditions.