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논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 하만영
- 발행연도
- 2017
- 저작권
- 부산대학교 논문은 저작권에 의해 보호받습니다.
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초록· 키워드
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A numerical study on the flow and heat transfer characteristics of a newly shaped heat exchanger with inclined rectangular pin-fins in the flow direction has been conducted. Application to surface-air-cooled-oil cooler for high efficiency aircraft engines was considered, which accompanies the high speed air flow inside the bypass duct.
For the computational model, a straight channel having heated surface on the bottom was constructed. Pin-fins were arranged in the channel and the periodic boundary condition was used in the span-wise direction. Three-dimensional numerical calculations of the flow and conjugate heat transfer problem were conducted using finite volume method based on SIMPLE algorithm and k-ε turbulence model. To validate the analysis, previous experiment results were used.
Analyses on effects of inclined angle, cross-section area of pin-fins and area of hot side have been carried out. The height of the top bypass was also varied to examine its effect on the performance. The compactness of heat exchanger was assessed by using area and volume goodness factors in the Reynolds number range of 13000-60000. Due to the inclination angle of pin-fins, additional pressure gradient in the direction to the heat transfer surface is generated, which results in a downward cooling flow and increase in the heat transfer performance on the bottom surface. The change in heat transfer performance with variation of top bypass height was also considered. To assess the velocity profile distortion, a new parameter of downward flow eccentricity was proposed and compared its result with the boundary layer shape factor results.
For the computational model, a straight channel having heated surface on the bottom was constructed. Pin-fins were arranged in the channel and the periodic boundary condition was used in the span-wise direction. Three-dimensional numerical calculations of the flow and conjugate heat transfer problem were conducted using finite volume method based on SIMPLE algorithm and k-ε turbulence model. To validate the analysis, previous experiment results were used.
Analyses on effects of inclined angle, cross-section area of pin-fins and area of hot side have been carried out. The height of the top bypass was also varied to examine its effect on the performance. The compactness of heat exchanger was assessed by using area and volume goodness factors in the Reynolds number range of 13000-60000. Due to the inclination angle of pin-fins, additional pressure gradient in the direction to the heat transfer surface is generated, which results in a downward cooling flow and increase in the heat transfer performance on the bottom surface. The change in heat transfer performance with variation of top bypass height was also considered. To assess the velocity profile distortion, a new parameter of downward flow eccentricity was proposed and compared its result with the boundary layer shape factor results.
목차
1. 서론 12. 수치해석 방법 102.1 계산 영역 및 핀 형상 102.2 지배 방정식 및 경계 조건 112.3 변수 및 무차원 식 122.4 검증 결과 비교 153. 결과 및 토의 163.1 유동방향으로 기울어진 핀-휜의 각도에 대한 효과 163.2 핀-휜의 단면 형상 변화에 대한 영향 283.3 스케일드-업(scaled-up)에 대한 영향 323.4 상부 바이패스에 대한 영향 373.5 열교환기 무게 분석 및 하행류 정도 평가 424. 요약 및 결론 46References 89Abstract 97
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