Abstract
Rarefied gas flow into vacuum through short tubes at variable wall temperatures was studied numerically with the direct simulation Monte Carlo method. A wide range of tube wall temperatures varying from 120 to 1200 K was considered, as well as several rarefaction parameters and tube aspect ratios. The mass flow rate, specific impulse, thrust, and characteristics of the gas flow field were analyzed. The results showed that the tube wall temperature, as well as the aspect ratio and rarefaction parameter, had a significant influence on the characteristics of the tube flow. The mass flow rate was found to decrease with increasing wall temperature, while the specific impulse increased. This paper reveals the combinations of rarefaction parameter and aspect ratio whereby the wall temperature has the strongest influence on the flow field of the gas, as well as on the overall macroscopic parameters.
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