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첨가제 종류 따른 탄소나노튜브 금속복합재료 소결코팅 영향
정희여(XiRu Zheng),피알라고 애드워드(E.J. Pialago),배성만(Song Man Bei),유다영(Da Young You),박찬우(Chan Woo Park),김종석(Zhon Sog Kim),임익태(Ick Tae Im) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The coating of metal surface with carbon nanotubes (CNTs) has been studied for the heat transfer enhancement of the boiling and condensation of refrigerant. The multiwalled carbon nanotube / copper oxide (CuO) composite powder, which has been surface modified by dispersant and PVA solution, was ultrasonically sprayed and sintered on a copper wafer. In this paper, experiments were performed to assess the characterization and comparison of the carbon nanotube before and after sinterning and the morphology changes of the CNT/CuO-coated surface by using different dispersants. The dispersants used are THF, SDBS, and SDS. The samples were examined by the Scanning Electron Microscope (SEM), Thermogravimetric analysis(TGA) ,Differential Scanning Calorimetersand(DSC)and Raman Spectroscopy.
열전달 촉진을 위한 탄소나노튜브(CNT)/금속 복합체 소결 코팅에 관한 연구
정희여(XiRu Zheng),피알라고 애드워드(E.J. Pialago),유다영(Da Young You),김종석(Zhon Sog Kim),임익태(Ick Tae Im),박찬우(Chan Woo Park) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.11
The coating of metal surface with carbon nanotubes (CNTs) has been studied for the heat transfer enhancement of the boiling and condensation of refrigerant. we make the multiwalled carbon nanotube/copper composite powder by th attrition milling, and the multiwalled carbon nanotube/copper composite powder, which has been coated on the copper wafer by electrostatic powder caoting and sintered with electric furnace. In this paper, experiments were performed to assess the characterization and comparison of the carbon nanotube before and after sinterning and the morphology changes of the CNT/CuO-coated surface. The samples were examined by the Scanning Electron Microscope (SEM), Energy-dispersive X-ray spectroscopy(EDAX).
Graphene 입자 코팅 표면의 비등 열전달 특성에 대한 연구
정희여(Xi Ru Zheng),애드워드(E.J. Pialago),박찬우(Chan Woo Park) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
In the present study, the effect of graphene coating on boiling heat transfer is being investigated under a pool of saturated R134a. The influence of the coating thickness and the graphene content on the heat transfer was studied. Finally, the boiling performance of a graphene coated surface is compared with that of carbon nanotubes, acid-treated grapheme, diamond, copper coated surface.
CNT/Cu 복합입자 소결코팅의 비등열전달 특성에 대한 연구
정희여(Xi Ru Zheng),애드워드(E.J.Pialago),유다영(Da Yong You),박찬우(Chan Woo Park) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
In the present study, the effect of CNTs coating on boiling heat transfer is being investigated under a pool of saturated R134a. The coating of metal surface with carbon nanotubes (CNTs) has been studied for the heat transfer enhancement of the boiling and condensation of refrigerant. we make the multiwall carbon nanotube/copper composite powder by th attrition milling, and the multiwall carbon nanotube/copper composite powder, which has been coated on the copper wafer by electrostatic powder coating and sintered with electric furnace. The influence of the temperature of the sintering, the ball milling time for the powder fabrication and the CNTs content on the heat transfer was studied. Finally, the boiling performance of a CNTs coated surface is compared with that of bare surface, pure copper powder coated surface by sintering.
TiO₂가 코팅된 CNT/Cu 복합소재의 응축 열전달 특성 연구
유다영(Da Young You),정희여(XiRu Zheng),피알라고 애드워드(E.J. Pialago),박찬우(Chan Woo Park) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
The characteristic of condensation heat transfer of TiO₂ coated CNT/Cu composite is studied in R-134a. The experimental condition is that the pressure is 3㎏/㎝2 and the saturate temperature of refrigerant is 8.56℃. CNT is coated TiO₂ by sol-gel solution method. CNT per Cu is 10vol% that set standards for the effect of TiO₂. In the case of the TiO₂ coated CNT. condensation heat flux and condensation heat transfer coefficient is increased. Because the hydrophilic is increased, the surface tension is increased and thermal resistance is decreased.