Simulation of constant wall-temperature heat transfer in microchannel by Direct Simulation Monte Carlo Method

Pressure-driven gaseous flow in microchannel under constant wall-temperature boundary condition was simulated with Direct Simulation Monte Carlo (DSMC) method. The velocity and temperature distributions were presented for different wall temperatures and different ratios of microchannel length to height. The simulation results show that; Compressibility plays an important role on the temperature distributions and the actual temperature distributions are affected by both compressibility and heat transfer condition. The streamwise distribution of gas temperature may decrease when the gas is heated by the wall due to significant compressibility in short microchannel. When the gas is heated by wall, the pressure gradient increases and the profile of streamwise velocity becomes raised near the channel entrance. The cross-sectional averaged velocity decreases in the case of Kn = 0.055 and increases in another case of Kn = 0.88. The variation of friction factor with the wall temperature is distinct when gas flows in slip and transition regions.