ИСТИНА

The work is devoted to the problem of the air outflow into a vacuum through a slot of height h and length L, which is periodically interrupted by bodies (runner) moving toward the jet. The runner consists of an infinite periodic sequence of identical blades of height d and length s, spaced at a distance l from each other. The runner moves with a constant velocity v_w. The pressure p_0, temperature T_0 and molar fraction χ_0 of the light component in the reservoir to the left of the slot were maintained, and the reservoir to the right of the slot is pumped out to very low pressures, so in the calculations it was assumed p_1=0. The stator and runner surface temperatures were assumed to be equal to the gas temperature in the left reservoir: T_w=T_0. An idealized statement of this problem was considered earlier [1]. The present study is a generalization of the previous one to the case of (1) a finite gap between blades and slot walls and (2) consideration of rotational degrees of freedom in the gas. The problem was solved by the method of event-driven molecular dynamics (EDMD) [2], using the collision model for nitrogen and oxygen, proposed [3,4] by the author on the basis of the results of trajectory MD calculations. It was obtained that the presence of a finite gap between the blades and the slot walls significantly changes the logic of designing such gas separation devices. The research is carried out using the equipment of the shared research facilities of HPC computing resources at Lomonosov Moscow State University and the Joint Supercomputer Center of the Russian Academy of Sciences. The reported study was supported by the Russian Science Foundation (project № 20-71-10049). REFERENCES [1] A. Yakunchikov and V. Kosyanchuk, Acta Astronautica, 163, Part A, 120 (2019). [2] A. Yakunchikov and V. Kosyanchuk, Computers and Fluids, 170, 121 (2018). [3] A. Yakunchikov, V. Kosyanchuk, A. Iuldasheva, Physics of Fluids, 32(10), 102006 (2020). [4] See https://multiscale.ru/science/collisionmodel for C++ code of the collision model for air.