MECHANISM RESEARCH OF COUPLING DRAG REDUCTION AND HEAT TRANSFER ON SURFACE WITH DIFFERENT LIQUID-SOLID INTERACTION

摘要

In order to study the effect of liquid-solid interaction and surface temperature on drag reduction and heat transfer, non-equilibrium molecular dynamics simulation is performed to investigate the density profile, velocity profile, velocity slip and temperature profile of fluid by changing liquid-solid interaction factor a and surface temperature. The result shows that there is a low density layer near the surface when a is small (weak liquid-solid interaction), larger a (strong liquid-solid interaction) can induce density oscillation and solid-like layer near the surface. Velocity slip will decrease as the increases of a. It's worth noting that for α < 0.02, the density oscillation becomes more obvious as the rises of temperature, which impairs drag reduction; For α > 0.02 , the rises of temperature will impair the oscillation, which enhances drag reduction. Due to the existence of low density layer, the heat transfer capacity is very weak when a is small, but the capacity will be enhanced as the increases of a.