개질된 표면을 이용한 풀비등 임계열유속 증진에 관련한 실험적 연구

다국어 초록 (Multilingual Abstract)

In the boiling heat transfer mechanism, CHF(critical heat flux) is the significantly important parameter of the system. So, many researchers have been struggling to enhance the CHF of the system in enormous methods. Recently, there were lots of researches about enormous CHF enhancement with the nanofluids. In that, the pool boiling CHF in nanofluids has the significantly increased value compared to that in pure water because of the deposition of the nanoparticle on the heater surface in the nanofluids. The aim of this study is the comparison of the effect of the nanoparticle deposited surface and the modified surface which has the similar morphology and made by MEMS fabrication. The nanoparticle deposited surface has the complex structures in nano-micro scale. Therefore, we fabricated the surfaces which has the similar wettability and coated with the micro size post and nano structure. The experiment is performed in 3 cases : the bare surface with 0.002% water-ZnO nanofluids, the nanoparticle deposited surface with pure water and the new fabricated surface with pure water. The contact angle, a representative parameter of the wettability, of the all 3 cases has the similar value about 0 and the SEM(scanning electron microscope) images of the surfaces show the complex nano-micro structure. From the pool boiling experiment of the each case, the nanoparticle deposited surface with pure water and the fabricated surface with pure water has the almost same CHF value. In other words, the CHF enhancement of the nanoparticle deposited surface is the surface effect. It also shows that the new fabricated surface follows the nanoparticle deposited surface well.

목차 (Table of Contents)

• Abstract
• 1. 서론
• 2. 풀 비등 실험
• 3. 실험결과 및 토의
• 4. 결론
• 후기
• 참고문헌

참고문헌 (Reference)

1 Costello, C. P., "The Roles of Capillary Wicking and Surface Deposits in the Attainment of High Pool Boiling Burnout Heat Fluxes" 10 (10): 393-398, 1965

2 Golobic, I., "The Role of Enhanced Coated Surface in Pool Boiling CHF in FC- 72" 36 (36): 525-531, 2000

3 Dinh, T. N., "The Micro- Hydrodynamics that Govern Critical Heat Flux in Pool Boiling" 2007

4 Xue, H. S., "The Interface Effect of Carbon Nanotube Suspension on the Thermal Performance of a Two- Phase Closed Thermosyphon" 100 : 104909-, 2006

5 Kim, S. J., "Surface Wettability Change During Pool Boiling of Nanofluids and Its Effect on Critical Heat Flux" 50 : 4105-4116, 2007

6 Roy Chowdhury, S. K., "Surface Effects in Pool Boiling" 28 (28): 1881-1889, 1985

7 Liter, S. G., "Pool-boiling CHF Enhancement by Modulated Porous-Layer Coating: Theory and Experiment" 44 : 4278-4311, 2001

8 Takata, Y., "Pool Boiling on a Superhydrophilic Surface" 27 : 111-119, 2003

9 Moreno, Jr. G., "Pool Boiling Heat Transfer of Alumina- Water, Zinc Oxide-Water and Alumina–Water + Ethylene Glycol Nanofluids" 2005

10 Vassalo, P., "Pool Boiling Heat Transfer Experiments in Silica– Water Nano-Fluids" 47 : 407-411, 2004

11 Das, S.K., "Pool Boiling Characteristics of Nano-Fluids" 46 : 851-862, 2003

12 Nanostructed & Amorphous Materials Inc, "Nanostructed & Amorphous Materials Inc"

13 Anderson, T. M., "Microelectronic Cooling by Enhanced Pool Boiling of Dielectric Fluorocarbon Liquid" 551-560, 1988

14 Wen, D., "Mechanisms of Thermal Nanofluids on Enhanced Critical Heat Flux (CHF)" 51 : 4958-4965, 2008

15 Hahne, E., "Hydrodynamic and Surface Effects on the Peak Heat Flux in Pool Boiling" 209-214, 1978

16 Zuber, N., "Hydrodynamic Aspects of Boiling Heat Transfer" University of California 1959

17 Coleman, H.W., "Experimentation and Uncertatinty Analysis for Engineers 2nd Edition" John Wiley & Sons, Inc. 1999

18 Messina, A. D., "Effects of Precise Arrays of Pits on Nucleate Boiling" 24 : 141-145, 1981

19 Liaw, S. P., "Effect of Surface Wettability on Transition Boiling Heat Transfer from a Vertical Surface" 2031-2036, 1986

20 You, S .M., "Effect of Nanoparticles on Critical Heat Flux of Water in Pool Boiling Heat Transfer" 83 (83): 3374-3376, 2003

21 Kim, H., "Effect of Nanoparticles on CHF Enhancement in Pool Boiling of Nano-Fluids" 49 : 5070-5074, 2006

22 Fong, R. W. L., "Correlation Between the Critical Heat Flux and theFractal Surface Roughness of Zirconium Alloy Tubes" 8 : 137-146, 2001

23 Tak, Y., "Controlled Growth of Well-Aligned ZnO Nanorods Array Using a Novel Solution Method" 109 (109): 19263-19269, 2005

24 Bang, I. C., "Boiling Heat Transfer Performance and Phenomena of Al2–O3– Water Nano-Fluids from a Plain Surface in Pool Boiling" 48 : 2407-2419, 2005

25 Kandlikar, S. G., "A Theoretical Model to Predict Pool Boiling CHF Incorporating Effects of Contact Angle and Orientation" 123 : 1071-1079, 2001