(A) study of collision cross-sections and non-equilibrium flow analyses using a molecular collision approach = 분자 충돌 해석을 통한 충돌단면 및 비평형 상태 해석에 관한 연구

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To investigate the non-equilibrium phenomena of bimolecular collisions for hypersonic thermodynamics or rarefied gas dynamics, the cross-section models of elastic and inelastic collisions are needed. The total cross-section is the summation of elastic and inelastic collision cross-sections. The inelastic cross-section is represented by state-to-state cross-section where the state-to-state means that initial rotational and vibrational state of the molecule is transferred to other state by the molecular collision. In the present study, total cross-section model for direct simulation Monte-Carlo calculation, the state-to-state cross-sections and rate coefficients, and non-equilibrium phenomena were investigated. For total cross-sections, modification and expansion of the collision parameters for the general soft-sphere model were made for use in the Direct Simulation Monte-Carlo calculation of hypersonic flows in the temperature range of 300K to 50,000K. The collision integrals were expressed as a two-term function in a form of the inverse power of temperature, which was cast in terms of the soft-sphere scattering parameters and the four total cross-section parameters. Next, the most recent available data for the diffusion and viscosity collision integrals were collected and fitted into a function of temperature in the same form. By equating these expressions for the diffusion and viscosity collision integrals simultaneously, the five collision parameters were deduced as functions of species combinations. The resulting collision parameters for the general soft-sphere model were tabulated for 191 collision pairs involving 22 species. It was shown that the transport properties calculated by using the present collision parameters are much closer to experiments, theoretical data, and the values obtained by the ab-initio calculations from quantum-mechanically derived potential energy surfaces than existing total cross-section models. The Direct Simulation Monte-Car...
Advisors
Kwon, Oh-Joonresearcher권오준researcher
Description
한국과학기술원 : 항공우주공학전공,
Publisher
한국과학기술원
Issue Date
2009
Identifier
327806/325007  / 020055817
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 항공우주공학전공, 2009. 8., [ xii, 105 p. ]

Keywords

nonequilibrium thermophysics; rotation-vibration coupling; rotational and vibrational relaxation; DSMC; state-to-state transition; 비평형 열물리; 회전-진동 간섭; 회전; 진동 에너지 이완; 직접모사법; 에너지 준위 이동; nonequilibrium thermophysics; rotation-vibration coupling; rotational and vibrational relaxation; DSMC; state-to-state transition; 비평형 열물리; 회전-진동 간섭; 회전; 진동 에너지 이완; 직접모사법; 에너지 준위 이동

URI
http://hdl.handle.net/10203/26390
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=327806&flag=dissertation
Appears in Collection
AE-Theses_Ph.D.(박사논문)
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