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유체온도와 입자크기가 Al₂O₃ 나노유체의 열전도율에 미치는 영향
전찬희(Chanhee Chon),김경덕(D. Kihm),이신표(Shinpyo Lee),최웅소(U. S. Choi) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In this article, we report an experimental correlation (Eq. 1-a, 1-b or 1-c) for the thermal conductivity of Al₂O₃nanofluids as a function of nanoparticle size (ranging from 11-㎚ to 150-㎚ nominal diameters) over a wide range of temperature (from 21℃ to 71℃). Following the previously proposed conjecture from the theoretical point-of-view (Jang and Choi, 2004), it is first experimentally validated that the Brownian motion of nanoparticles constitutes a key mechanism of the thermal conductivity enhancement with increasing temperature and decreasing nanoparticle sizes.
제지건조기용 실린더드럼의 다중유로내의 응축수배출에 관한 이론적 연구
이기우(Ki Woo Lee),전원표(Won Pyo Chun),이계중(Kye Jung Lee),장석필(Seok Pil Jang),최웅소(U.S. Choi),하재청(Jae-Cheong Ha) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
The heat transfer process in the cylinder drum for paper drying consists of the thermal resistances by condensate thickness, thickness of shell, and the contact resistance between cylinder and canvas. The most thermal resistance in conventional cylinder drum is generated by condensate, which is specially increased by the increase of revolution per minute (RPM). In this paper, the condensate removal in the cylinder drum, w hich multi-flow channel is attached to the inside surface of cylinder, was analyzed. The maximum RPM of cylinder drum was exam ined for removing the condensate in multi-flow channel by steam pressure without siphon. Steam pressure, channel height, RPM, gap between cover plate and separate plate of steam and condensate and centrifugal force in channel and gap were examined as variables.