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빙축열 시스템에서의 코일 휜의 열전달 촉진 효과에 관한 시험적 연구
성병호(Sung Byung Ho),이분희(Lee Bun Hee),임광빈(Lim Kwang Bin),김철주(Kim Chul Ju) 한국에너지학회 2004 한국에너지공학회 학술발표회 Vol.2004 No.-
The present study was to investigate the heat transfer enhancement effect of coil wire fins in an ice storage system. For the two cases of tubes with internal brine flows, a finned tube with coil wires on its outer surface and a smooth tube, the rates of ice layer were tested and compared for both the icing processes. The coil fins were made of a stainless steel wire with a dia. of 2.0[mm], and the coil had an outer dia. of 10[mm] and a helix angle of 60[′].<br/> The experimental results showed that the coil fins could substantially reduce the thermal resistance of the ice layer, and enhance the heat flow rates between the water in the storage tank and the brine. The ice storing time was found to be shortened by 13[%] for the coil fins to get the same amount of ice layer that was built on the smooth tube wall for 10 hours of operation when the same thermal conditions were provided.
단일벽 탄소 나노튜브(SWNT) 강화 구리 복합체의 제조 및 기계적 특성에 관한 연구
성병호(Byung-ho Sung),오세영(Seyoung Oh),최지훈(Jee-hoon Choi),심언태(Untae Sim),김범준(Bumjoon Kim),백승현(Seunghyun Baik),임병수(Byengsoo Lim),김철주(Chul-ju Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Carbon nanotubes were coated by nickel to increase interfacial bonding on copper matrix materials. Mixing processes of ultrasonicating single-walled carbon nanotubes and copper powders were carried out in ethanol to obtain the uniform composition of specimens. The nanocomposite materials were fabricated by sintering processes, which consists of mixing carbon nanotubes with matrix powders followed by hot-pressing. The mechanical properties of single walled carbon nanotube reinforced copper matrix nanocomposite materials have been investigated by SP-creep test and wear test. The displacement rate of nickel-coated nanotube-copper composite was found to increase at 200℃ when compared with pure copper or other nanocomposite materials. The incorporation of carbon nanotubes and nickel-coated carbon nanotubes in the copper matrix composites decreased friction coefficients and increased times up to the onset point of scuffing, compared with those of pure copper specimens.
김성대(Sung-Dae Kim),강환국(Hwan-Kook Kang),성병호(Byung-Ho Sung),김철주(Chul-Ju Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
For the present study, three heat pipes with different thickness of sintered metal wick were manufactured, and their operational performances, such as capillary limit and thermal resistance were tested and compared with theoretical predictions. Experimental results showed good agreement with those by the theoretical model, and that seemed to present that the sintering process we had developed in the present study was valid.
A Study on the Manufacturing Technology for the Development of Heat Pipes with a Sintered Metal Wick
Jee-Hoon Choi(최지훈),Sung-Dae Kim(김성대),Byung-Ho Sung(성병호),Seong-Ryou Roo(유성열),Hyung Ki Park(박형기),Chul-ju Kim(김철주),Han Seo Ko(고한서) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
The most the electronic industry has recently accelerated the modularization, the miniaturization and the high integrated trend of electronics fields such as electronics components, appliances and etc., the most increasingly the heat generation problem rises. Even though the conventional cooling technologies are widely used in order to reduce the heat loads, the technologies are not easy to meet the present trends due to the fact that most of many conventional methods are relative to external form environments such as size, design and so on. With regardless of those environments, however, a heat pipe is one of the most efficient systems to improve the heat transfer performance. And then the performance of the heat pipe depends on a wick structure. Of various wick structures, sintered metal wick is known so that it has some advantages such as smaller pore size, increasing porosity as well as high reliability. In this study sintered metal wicks, thickness 0.7 ㎜, 0.8 ㎜ and 0.9 ㎜, were manufactured as of 100㎛ copper powder to obtain the manufacturing technology of heat pipes mounted with a sintered metal wick. Furthermore, experiments for the operational performance factors such as capillary limit, thermal resistance were not only performed but also compared with a theoretical model simultaneously. Experimental results agreed with the theoretical model, and then it seems to be required to study various development processes of sintered metal wicks for the high performance of a heat pipe system.
Xuan Hung Nguyen,Byung-ho Sung(성병호),Jeehoon Choi(최지훈),Junghyung Yoo(유정현),Minwhan Seo(서민환),Chulju Kim(김철주) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
This paper investigates the plate loop heat pipe system with an evaporator mounted with fin-wick structure to dissipate effectively the heat generated by the electronic components. The heat transfer formulation is modeled and predicted through thermal resistance analysis of the fin-wick structure in the evaporator. The experimental approach measures the thermal resistances and the operating characteristics. These results gathered in this investigation have been used to the objective of the information to improve the LHP system design so as to apply as the future cooling devices of the electronic components.
평판형 윅을 갖는 소형 루프 히트파이프의 윅 건조한계에 대한 해석적 연구
유성열(Seong-ryoul Ryoo),성병호(Sung-ho Byung),최지훈(Ji-hoon Choi),김철주(Chul-ju Kim),임광빈(Kwang-bin Lim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
In principle of LHP operation it is assumed that the evaporation of working fluid takes place at the interface of heating wall and the primary wick, admitting the complete saturation of porous wick with the liquid phase. But it has been found from lots of experimental investigations that the line of vapor-liquid meniscus draws back toward the center of the wick with an increasing heat load, showing the existence of a dried zone. The appearance of dried zone changes the flow mechanism through the wick, resulting in increasing the pressure drop over the wick. This is the origin of wick dry limitation for LHPs. The quantity of wick dry limitation seems to lie on the depth of dried zone but in reality it is a complicate matter to predict the vapor front line as a function of wick geometry parameters, fluid properties and rates of heat supply. In this study wick limitation was measured from experiments using the given LHP model developed for the present study and the data were put to evaluate the existing depth of dried zone as a function of heat rates.