Micro/nano electromechanical systems (MEMS/NEMS), which are small in size, consume low energy, emit less heat, and provide high sensitivity and precision, have received great attention over the past two decades. With reduced device size, extremely high specific surface area, and confinement by solid walls, nanoconfined fluids exhibit many properties that are completely different from those of bulk fluids. However, the underlying mechanism of convective heat transfer in nanoconfined fluids remains unclear. The velocity slip and temperature jump at the fluid-solid interface have become important factors affecting convective heat transfer. The present study takes full account of the velocity slip and temperature jump at the fluid-solid interface as well as the abnormal thermal conductivity of confined fluids at the nanoscale. The boundary conditions of the 2D heat transfer energy equation are modified. The effects of axial heat conduction and viscous dissipation on heat transfer performance are investigated. Finally, the accuracy of the model is verified through molecular dynamics simulations.
 

Axial conduction, Slip length, Viscous dissipation, Temperature jump length