**3.1 Verification**

In order to evaluate the precision and correctness of the numerical results, it is highly significant to compare simulation with experimental data. As mentioned in the previous section, the results of the SPARTA and DSMC are compared with experimental data (**Figure 6**). The comparison of results of simulations with that of experimental data of Strongrich et al. [21] for various pressure conditions shows that applied assumptions and procedures is logic and reasonable. In addition, obtained results of the SPARTA-DSMC code [21] also confirm the correctness of our results. The evaluation displays a worthy agreement of our work with other techniques.
