인공 캐비티를 가진 히터를 이용한 가열면 경사각에 따른 포화상태 풀 핵비등 열전달 기초연구
Heat Transfer Characteristics under Saturated Nucleate Pool Boiling for Various Heating Surface Angles using Heater with Artificial Cavity
2
조회
0
다운로드
1
인용
0
참고문헌
키워드
초록
Nucleate pool boiling experiments with constant heat flux condition were performed using pure R11 and R113 for various surface angles under saturated pool condition. A circular heater of 1 mm diameter, with artificial cavity in the center, fabricated using MEMS technique and the high-speed controller were used to maintain the constant heat flux. Images of bubble growth were taken at 5,000 frames per second using a high-speed CCD camera. The bubble geometry was obtained from the captured bubble images. The effects of surface angles on the bubble growth behaviors were analyzed as dimensional scales for the initial and thermal growth regions. The parameters for the bubble growth behaviors were bubble radius, bubble growth rate, sliding velocity, bubble shape and advancing and receding contact angles. These phenomena require further analysis for various surface angles, but this study will provide good experimental data with constant heat flux boundary condition for such works.
Abstract
Nucleate pool boiling experiments with constant heat flux condition were performed using pure R11 and R113 for various surface angles under saturated pool condition. A circular heater of 1 mm diameter, with artificial cavity in the center, fabricated using MEMS technique and the high-speed controller were used to maintain the constant heat flux. Images of bubble growth were taken at 5,000 frames per second using a high-speed CCD camera. The bubble geometry was obtained from the captured bubble images. The effects of surface angles on the bubble growth behaviors were analyzed as dimensional scales for the initial and thermal growth regions. The parameters for the bubble growth behaviors were bubble radius, bubble growth rate, sliding velocity, bubble shape and advancing and receding contact angles. These phenomena require further analysis for various surface angles, but this study will provide good experimental data with constant heat flux boundary condition for such works.
참고문헌 (9)
- Mikic, B. B., "On Bubble Growth Rates", Int. J. Heat Mass Transfer, 13, pp.657~666 (1970)
- Lee, H. C., "Single Bubble Growth in Saturated Pool Boiling on a Constant Wall Temperature Surface", Int. J. of Multiphase Flow, 29(12), pp.1857~1874 (2003)
- Kim, J., "Experimental Study of Pool Temperature Effects on Nucleate Pool Boiling", Int. J. of Multiphase Flow, 32, pp.208~231 (2006)
- Lee, H. C., "Single Bubble Growth in Saturated Pool Boiling of Binary Mixtues", Int. J. of Multiphase Flow, 30(6), pp.697~710 (2004)
- Githinji, P. M, "Some Effect of the Orientation of the Heating Surface in Nucleate Boiling", ASME J. Heat Transfer, 85, pp.379~ (1963)
- Chen, L. T., "Heat Transfer to Pool Boiling Freon from Inclined Heating Plate", Lett. Heat Mass Transfer, 5, pp.111~120 (1978)
- Jung, D. S., "Effects of Enhanced Surfaces and Surface Orientation on Nucleate and Film Boiling Heat Transfer in R-11", Int. J. Heat Mass Transfer, 30, pp.2627~2639 (1987)
- Chang, J. Y., "Heater Orientation Effects on Pool Boiling Micro-porous-enhanced Surfaces in Saturated FC-72", ASME J. Heat Transfer, 118, pp.937~943 (1996)
- Lee, J., "Microscale Bubble Nucleation from an Artificial Cavity in Single Microchannel", ASME J. of Heat Transfer, 125, pp.545~ (2003)