The basic and applied study on chf enhancement of nanofluid나노유체 임계열유속 증진에 관한 기초 및 응용 연구

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The objective of this study is measurement of critical heat flux(CHF) enhancement of SiC nanofluid and development of advanced CHF model for nanofluid. CHF is a significant safety criteria not only for nuclear power plant(NPP) but also every engineering device which utilizes two phase boiling heat transfer. Safety and efficiency of the system can be improved simultaneously if CHF is enhanced so many studies tried to enhance CHF in both of pool boiling and flow boiling. The representative methods for enhancing CHF are modification of surface, imposing additional physical transition to thermal-hydraulic system, and change of fluid properties. Recently, nanofluid technique is highlighted as an revolutionary way to change both of fluid properties and surface morphology. Nanofluid is colloidal solution containing nano or semi-nano sized particles in its base fluid. Many researches reported that the nanofluid can enhance thermal-hydraulic properties of the fluid, such as heat transfer coefficient, and CHF. In this study, CHF enhancement performance of SiC nanofluid was investigated in pool boiling experiment. The 3 different volume concentrations were utilized for CHF experiment, 0.0001%, 0.001%, and 0.01%. Zeta potential, and contact angle of the SiC nanofluid were measured. The pool boiling CHF experi-ments with SiC nanofluid were conducted under atmospheric pressure. Two different dimensions of test sec-tions were tested for verifying unusual CHF enhancement trends for SiC nanofluid. At 0.01% volume concentration condition, CHF was enhanced up to 105%. After nanofluid experiment, experiment with DI water utilizing nanoparticle deposited test section was conducted. CHF enhancement ratios of SiC nanoparticle deposited test sections were well corresponded with the results of SiC nanofluid. The unusual CHF enhancement trend was interesting because it did not linearly proportional to the nanoparticle concentration. The wettability transition of SiC nanoparticle depos...
Advisors
Chang, Soon-Heungresearcher장순흥
Description
한국과학기술원 : 원자력및양자공학과,
Publisher
한국과학기술원
Issue Date
2014
Identifier
568688/325007  / 020107047
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 원자력및양자공학과, 2014.2, [ ix, 82 p. ]

Keywords

Critical Heat Flux; 실리콘 카바이드; 임계열유속 증진; 나노유체; 임계열유속; Silicon Carbide; Nanofluid; CHF enhancement

URI
http://hdl.handle.net/10203/197268
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=568688&flag=dissertation
Appears in Collection
NE-Theses_Ph.D.(박사논문)
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