개질된 표면을 이용한 풀비등 임계열유속 증진에 관련한 실험적 연구 (Experimental Investigation of CHF Enhancement on the Modified Surface Under Pool Boiling)

서지정보

· 발행기관 : 대한기계학회
· 수록지 정보 : 대한기계학회논문집 B / 33권 / 11호 / 840 ~ 848페이지
· 저자명 : 강순호, 안호선, 조항진, 김무환, 김형모, 김준원

초록

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.

영어초록

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.

참고자료

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