Computer simulation of gas molecular distribution in a cube container under molecular flow

Based on the cosine emission law which is one of the classical laws in the gas-kinetic theory, by the means of the computer simulation calculation, it is quantitatively proved that the molecular incidence rates and emission rate on the inner surfaces of a cube container are uneven distributed. In the case of dividing the one square surface into 100 units, both data and sketch show that the maximum unit incidence rate is 2.7% larger than the average value, whereas the minimum unit incidence rate is 5.7% smaller than the average value.