In the current work, the impact of shear work due to the slip velocity on non-equilibrium heat transfer in a pressure driven micro/nanochannel is evaluated under constant wall heat flux condition. The DSMC method is employed as our numerical tool. Implementation of the wall heat flux in the DSMC method is performed using the “modified Iterative technique” which in general eliminates the difficulty of implementation in adiabatic conditions and improves the convergence speed. We investigate the effects of rarefaction, property variations and compressibility. The numerical results show that shear stress on the walls significantly affects all aspects of the flow behavior and heat transfer through micro/nano channel such as the velocity slip and heat flux rates. We also analyze the counter gradient heat flow phenomenon appearing at the cooling conditions. The shear work always behaves like a heat source (heat flux) due to a considerable heat generation made by the slip velocity at the wall. The latter could be formulated as us× τxy. It is observed that this heat source affects the heat flux applied to the walls and may overcome the wall heat flux, i.e., in the case of low cooling heat flux condition, shear work causes the flow field to be heated

Keywords