Study of slip-flow forced convection in straight microchannels of uniform in Circular cross-section

In this literature، a theoretically study of A superposition approach due to slip-flow forced convection in a micro channels tube shape. Axial symmetry in two-dimensional steady incompressible laminar flow slip considered the superposition model is used to analyze the behavior of the fluid Constant wall heat flux thermal boundary conditions are considered to be constant and all physical properties. It is assumed that inlet velocity and temperature distribution in the micro channel are uniform. Equations، including continuity، momentum and energy equations using specific variables have been dimensionless. Set of differential equations considering with the boundary conditions have been solved، then، Explicit expression for the velocity distribution، temperature and Nusselt number are derived. Axial velocity، temperature، local Nusselt number and dimensionless temperature، dimensionless wall heat flux thermal boundary condition constant for a wide range of Prandtl number and the ratio of the Nadsn number slip are obtained. It can be seen from obtained result that، as Prandtl number increases the Nusselt number increases. Also، the results show that، considering the reduction of the slip at the wall the Nusselt number decreases.