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김형국(H. K. Kim),최병철(B. C. Choi),김민국(M. K. Kim),최재혁(J. H. Choi),정석호(S. H. Chung) 한국연소학회 2008 KOSCOSYMPOSIUM논문집 Vol.- No.-
The effect of AC electric field on flame position in counterflow burner has been investigated experimentally by varying the voltage and frequency. The result showed that the flame position maintained the typical flame shape above critical frequency, which was stable regardless of applied voltage amplitude. In contrary, below critical frequency, the flame position was oscillated. The oscillating flames were categorized in two regimes. For high frequency regime from 2 ㎐ to critical value, the flame position was sinusoidally oscillated with increasing amplitude as applied voltage amplitude increases. And for low frequency regime below 2 ㎐, the flame position was complicatedly oscillated with peak phenomenon having rapid variation of the position. In such a case, the low frequency oscillating flames were controlled by interaction between the flame position variation on DC electric field and the chemically response time on AC electric field.
고온초전도체 Y₁Ba₂Cu₃O7-δ 박막의 Hall 효과
허재호(J. H. Her),류제천(J. C. Ryu),김형국(H. K. Kim),김장환(J. W. Kim) 한국자기학회 1994 韓國磁氣學會誌 Vol.4 No.1
High Tc superconducting Y₁Ba₂Cu₃O_(7-δ) thin film was grown up for c-axis orientation by epitaxial growth method on LaAlO₃ single crystal substrate. The crystal structures of this thin film were found to be c-axis orientation by X-ray diffraction patterns. Hall effect and resistivity measurements were made by van der Pauw method. Hall resistivity was calculated from the magnetoresistivity by considering thermomagnetic effect. The relation was ρ_H = ρ_stanα_n - QBT Ss/Ks The measured Hall resistivity and the calculated one are in good agreement each other.
Effect of Low Frequency AC Electric Fields on Counterflow Diffusion Flames
최병철(B. C. Choi),김형국(H. K. Kim),김민국(M. K. Kim),최재혁(J. H. Choi),정석호(S. H. Chung) 한국마린엔지니어링학회 2009 한국마린엔지니어링학회 학술대회 논문집 Vol.2009 No.-
The effect of electric fields on the response of diffusion flames in a counterflow has been investigated experimentally by varying the voltage and frequency of AC. The result showed that the flame was stationary with high frequency above the threshold frequency. Below the threshold frequency, the flame oscillated by exhibiting near sinusoidal or complex behaviour. This oscillation can be attributed to the ionic wind effect by the generation of bulk flow, arising from the momentum transfer between neutral molecules and ions, where the ions in the flame were accelerated by the Lorentz.