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증류수 중 전기폭발에 의한 Cu 나노분말 제조 및 분석
조주현(Chuhyun Cho),진윤식(Yun-Sik Jin),강충일(Chungil Kang),이경자(Gyung-Ja Lee),이창규(Chang-Kyu Rhee) 대한전기학회 2010 전기학회논문지 Vol.59 No.7
The Cu powder was prepared in distilled water. It has a wide range of size distribution. The submicron-sized particles in the Cu powder were removed by using continuous type centrifugal separator. The average particle size after classification was approximately 50㎚. The XRD analysis showed that pure Cu phase and oxide phase (Cu₂O)weremixedinthepowderpreparedbythismethod.
전기선 폭발법에 의해 제작된 에틸렌 글리콜 기반 ZnO 나노유체의 열전도도
김현진(Hyun Jin Kim),황교식(Kyo Sik Hwang),신현교(Hyun Kyo Shin),이창규(Chang kyu Rhee),이경자(Gyung-Ja Lee),윤종호(Jong-Ho Yoon),장석필(Seok Pil Jang) 대한기계학회 2012 大韓機械學會論文集B Vol.36 No.2
본 연구에서는 에틸렌 글리콜 기반의 ZnO 나노유체의 열전도도를 비정상열선법(Transient Hot Wire Method)를 이용하여 10℃에서 50℃까지 측정하였다. 에틸렌 글리콜 기반의 ZnO 나노유체는 전기선 폭발법을 사용하여 부피비 1%, 3%, 5.5%로 제작 되었으며, 투과전자현미경(Transmission Electron Microscope, TEM)을 이용하여 제작된 에틸렌 글리콜 기반의 ZnO 나노유체의 분산·부유 특성을 확인하였다. 열전도도 측정 결과 에틸렌 글리콜 기반의 ZnO 나노유체는 부피비에 따라 향상하였으며, 5.5%의 부피비에서 최대 26.5%의 열전도도 향상을 보였다. 측정 결과는 기존의 열전도도 예측 모델인 Maxwell 및 Hasselman & Johnson model 과 비교하였다. In this paper, the thermal conductivities of ethylene glycol? based ZnO nanofluids manufactured using the pulsed wire evaporation method are experimentally measured using the transient hot wire method at temperatures in the range of 10℃ to 50℃. For this purpose, ethylene glycol?based ZnO nanofluids with 1%, 3%, and 5.5% volume fractions were manufactured using the pulsed wire evaporation method. Transmission electron microscopy (TEM) was performed to investigate the suspension stability of the ethylene glycol?based ZnO nanofluids. Based on the experimental results, the thermal conductivities of ethylene-glycol-based ZnO nanofluids increase with increasing volume fractions of ZnO nanofluids. The maximum enhancement of the thermal conductivity is 26.5% for a volume fraction of 5.5% at 22℃. Finally, the experimental results are compared with conventional models such as the Maxwell and Hasselman & Johnson models.
전기선 폭발법에 의해 제작된 에틸렌 글리콜 기반 ZnO 나노유체의 열전도도
김현진(Hyun Jin Kim),황교식(Kyo Sik Hwang),신현교(Hyun Kyo Shin),이창규(Chang Kyu Rhee),이경자(Gyung-Ja Lee),장석필(Seok Pil Jang) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
In this paper, thermal conductivities of ethylene glycol-based ZnO nanofluids which are manufactured by pulsed wire evaporation method are experimentally investigated by transient hot wire method for different temperatures ranging from 10℃to 50o℃. For the purpose, ethylene glycol-based ZnO nanofluids with 1% and 5.5% volume fraction are manufactured by pulsed wire evaporation method. TEM is measured to investigate suspension stability of ethylene glycol-based ZnO nanofluids. According to the experimental results, thermal conductivities of ethylene glycol-based ZnO nanofluids are increasing as volume fraction of ZnO nanofluids is getting higher and maximum enhancement of thermal conductivity is 26.5% for volume fraction 5.5% at 22℃. Finally, experimental results are compared with conventional model such as Maxwell and Maxwell-Garnett model.