2024-03-28T10:56:54Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00030708
2023-01-16T04:53:31Z
320:2524:2544:2546
Direct simulation of effusion and expansion flows from a slit into a vacuum
Soga, Takeo
Kim, Byung Gon
Suda, Hideo
open access
Effusion flows from a two-dimensional porous surface and expansion flows from a sonic slit were studied based upon the DSMC method. Present simulation was carried out under the suspicion that thermal motion of gas molecules would partially change into back flow in effusion flow. Effusion flow was accelerated to a supersonic expansion flow but the virtual stagnation pressure of this expansion flow was much lower than the pressure at the surface. Features of effusion flow with back flow were revealed. No substantial back flow was seen even in the effusion flow from a porous surface. The back flow seemed to be separated from the main flow of the effusion and effects of the back flow were very restricted. Several cell sizes were employed in the simulation of expansion flow. It was found that cell size should be finer than (slit hight/60)[Χ](slit hight/60) so that we might obtain accurate density contour. Value of the parameter p[0]d used in the simulation was about 24torr-mm, which was comparable with the conventional experimental conditions.
Faculty of Engineering, Nagoya University
1991-10-31
eng
departmental bulletin paper
VoR
https://doi.org/10.18999/memfenu.43.1.135
http://hdl.handle.net/2237/00032893
https://nagoya.repo.nii.ac.jp/records/30708
10.18999/memfenu.43.1.135
0027-7657
Memoirs of the Faculty of Engineering, Nagoya University
43
1
135
146
https://nagoya.repo.nii.ac.jp/record/30708/files/43-1-05.pdf
application/pdf
1.0 MB
2020-10-29