In the present study, the non-equilibrium effects at the stagnation wall in one-dimensional unsteady micro-flow responding to the external sinusoidal oscillation are investigated. The fluctuating behavior of the rarefied medium is simulated by employing the unsteady DSMC method for various conditions with the acoustic Reynolds number and the Knudsen number. The heat fluxes calculated from Maxwell-Smoluchowski’s relation and its higher order modifications are compared with the direct DSMC result. Consequently, it is found that there exists the non-equilibrium effect at the stagnation wall especially when the number of reflected molecules from the diffuse wall was small.

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