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응축기의 비응축 가스 배출 타입에 따른 틈 간격 비율의 영향에 대한 수치적 연구
제준호(Junho Je),김수재(Soo Jea Kim),최치웅(Chi-woong Choi),김무환(Moo Hwan Kim) 대한기계학회 2012 大韓機械學會論文集B Vol.36 No.1
본 논문은 응축기의 비 응축 가스 배출 타입에 따른 틈 간격의 비율이 응축기의 성능에 미치는 영향에 관하여 다공성 매질 개념을 적용한 수치적 연구에 관한 것이다. 다공성 매질의 개념을 이용한 응축기의 성능 해석에서는 응축기기 내부의 다관군을 다공성 매질로 간주하며, 다관군에 의한 압력강하는 상관식으로 반영한다. 상용수치해석 프로그램인 Fluent 와 user-defined functions 를 이용하여 McAllister 응축기에 다공성 매질 개념을 적용하여 3 차원 응축량을 해석하였다. 순수증기의 해석에서는 틈 간격이 응축량에 미치는 영향이 거의 없었다. 그러나 비 응축가스가 포함되어 있으며, 외부 배출의 경우 틈 간격은 응축량에 매우 큰 영향을 미쳤는데, 틈 간격이 줄어듦에 따라 응축량이 매우 증가하는 결과를 얻었다. A numerical analysis was carried out to estimate the effect of the gap size ratio on the performance of condensers under noncondensable gas ventilation using the porous medium approach (PMA). In the PMA, the details of the tube bundle in the condenser are considered to be those of a porous medium, and the flow resistance term is added in the momentum equation. Three-dimensional analysis of the condensation for a McAllister condenser was conducted with the PMA using Fluent and user-defined functions (UDFs). The gap size effect on the condensation was negligible under pure steam conditions. However, the gap size effect was dominant in condensation with noncondensable gas and external venting. As the gap size decreased, the condensation rate increased for noncondensable gas in an external venting system.
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응축기의 비응축 가스 배출 타입에 따른 틈 간격의 영향에 대한 수치적 연구
제준호(Junho Je),최치웅(Chi-woong Choi),김수재(Soo Jea Kim),김무환(Moo Hwan Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The numerical study to estimate performance for gap size effect for non-condensable gases ventilation type in condensers was carried out using the porous medium approach (PMA). In the PMA, the details of tube bundle in the condenser are considered as the porous medium, and the flow resistance term is added in the momentum equation. In this regard, the PMA is quite helpful for the study of tube bundle in the huge condenser. Three dimensional analysis of condensation for condenser with the PMA was conducted using Fluent and user-defined functions (UDFs). Gap size effect on condensation was negligible in pure steam condition. However, gap size effect was dominant in condensation with non-condensable gas and external venting. As gap size was decreased, condensation rate was increased for non-condensable gas and external venting system.
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응축기의 비응축 가스 배출 타입에 따른 질량 확산율의 영향에 대한 수치적 연구
제준호(Junho Je),최치웅(Chi-woong Choi),김수재(Soo Jea Kim),김무환(Moo Hwan Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
The numerical study to estimate performance for mass diffusivity effect for non-condensable gases ventilation systems in condensers was carried out using the porous medium approach (PMA). In the PMA, the details of tube bundle in the condenser are considered as the porous medium, and the flow resistance term is added in the momentum equation. In this regard, the PMA is quite helpful for the study of tube bundle in the huge condenser. Three dimensional analysis of condensation for condenser with the PMA was conducted using Fluent and user-defined functions (UDFs). The mass diffusivity effect on condensation was small in internal vent system. However, the mass diffusivity effect was dominant in condensation for external venting system. As the ratio of turbulent viscosity to fluid viscosity was increased, mass fraction of non-condensable gas was decreased. Therefore, total condensation rate was increased for external venting system.
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