Numerical study of unsteady film condensation with non-condensable gas
- 주제(키워드) Film condensation , Non-condensable gas , phase change , wavy interface
- 발행기관 서강대학교 일반대학원
- 지도교수 손기헌
- 발행년도 2020
- 학위수여년월 2020. 2
- 학위명 석사
- 학과 및 전공 일반대학원 기계공학과
- UCI I804:11029-000000064879
- 본문언어 영어
- 저작권 서강대학교 논문은 저작권보호를 받습니다.
초록/요약
Numerical simulation of wavy film condensation in a vertical channel with non-condensable gases is performed by combining unsteady differential equations for the vapor phase with unsteady integral boundary layer f ormulations for a very thin condensate film. The present method, which can save computational time significantly, can accurately consider t he condensation effect by explicitly implementing the velocity, stress, and heat flux conditions at the interface. An analytical model is also developed for internal flow condensation with non condensable gases. The numerical results for steady film conden sation with non condensable gases show good agreement with the analytical solutions. The present method is applied to investigate the effects of non condensable gas, inlet vapor velocity and wall subcooling on the condensate film thickness and heat flux in wavy film condensation.
more초록/요약
Numerical simulation of wavy film condensation in a vertical channel with non-condensable gases is performed by combining unsteady differential equations for the vapor phase with unsteady integral boundary layer f ormulations for a very thin condensate film. The present method, which can save computational time significantly, can accurately consider t he condensation effect by explicitly implementing the velocity, stress, and heat flux conditions at the interface. An analytical model is also developed for internal flow condensation with non condensable gases. The numerical results for steady film conden sation with non condensable gases show good agreement with the analytical solutions. The present method is applied to investigate the effects of non condensable gas, inlet vapor velocity and wall subcooling on the condensate film thickness and heat flux in wavy film condensation.
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