(An) experimental study on pool boiling characteristics of carbon nano tube (CNT) and fullerene (C-60) nanofluids = 탄소 나노 튜브(CNT)와 풀러린(C-60) 나노유체의 수조 비등 특성에 관한 실험적 연구

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In recent years, it was found that pool boiling critical heat flux (CHF) increases in nanofluids. The CHF conditions are important for safe and economic design of many heat transfer units including nuclear reactor. In this study, our objective is to evaluate the impact of Carbone Nano Tubes (Singlewalled CNTs and Multiwalled CNTs) and Fullerene (C-60) nanofluids at different particle concentration on pool boiling critical heat flux experimentally at saturated conditions. Multiwalled CNT and fullerene (C-60) added in the pure water at three volume concentrations (0.01%, 0.001%, and 0.0001%). Singlewalled CNT nanoparticles added in the pure water at two volume concentrations (0.0005%, and 0.0001%). For the dispersion of nanoparticles in pure water, several treatments were performed. Multiwalled CNTs and Fullerene (C-60) prepared using acid treatment, meanwhile two treatment are using for Singlewalled CNTs: (1)Singlewalled CNTs prepared using polymer treatment, (2)Singlewalled CNTs prepared using pre polymerization of micelle treatment. The zeta potential of CNTs and Fullerene nanofluids were in the range of 13-71 mV. The zeta potential of nanofluids was constant for more than one month. It concludes that the treatment has been succeeded produces water dispersible CNTs and Fullerene nanofluids with good stability. The critical heat flux (CHFs) of the solution is enhanced greatly for all nanofluids. Enhanced (~167.9%) CHF was observed for solutions with Multiwalled CNT nanoparticles with concentration 0.01 vol%. Enhanced (~109.4%) CHF was observed for solutions with Singlewalled CNT nanoparticles with concentration 0.0005 vol%. Enhanced (~108.9%) CHF was observed for solutions with Fullerene nanoparticles with concentration 0.01 vol%. The pool boiling Heat Transfer Coefficient (HTCs) of the CNTs nanofluids are lower than those of pure water in the entire nucleate boiling regime. On the other hand, the pool boiling HTCs of Fullerene nanofluids are higher ...
Advisors
Chang, Soon-Heungresearcher장순흥researcherNo, Hee-Cheonresearcher노희천researcherJeong, Yong-Hoonresearcher정용훈researcher
Description
한국과학기술원 : 원자력및양자공학과,
Publisher
한국과학기술원
Issue Date
2009
Identifier
327312/325007  / 020083968
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 원자력및양자공학과, 2009. 8., [ xiv, 87 p. ]

Keywords

임계열유속; 나노유체; 탄소 나노 튜브; 풀러린; 수조비등; CHF; Nanofluids; CNT; Fullerene; Pool Boiling

URI
http://hdl.handle.net/10203/49558
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=327312&flag=dissertation
Appears in Collection
NE-Theses_Master(석사논문)
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