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- 저자 : 고일곤(Ilgon Ko) (검색결과 3 건)
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고일곤(Ilgon Ko),곽호영(Ho-Young Kwak) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The pulse width from a bubble cloud under multibubble sonoluminescence (MBSL) conditions was measured for the first time using a time-correlated single photon counting technique (TC/SPC). The measured pulse width from several thousand bubbles in water was approximately 250.9 ps, with scattered pulses occurring 1.5 ns before and after the maximum light pulse intensity. The observed pulse width from a bubble cloud, which appears to be comparable to that of the single bubble sonoluminescence, indicates that the clouds of bubbles collapse simultaneous to emitting a light that is synchronized with the applied ultrasound. Also, pulse widths from clouds of multibubbles in water-surfactant and water alcohol solutions were measured to investigate the surfactant and alcohol effect on the sonoluminescence intensity and pulse width. Size distribution of the bubble cloud at the multibubble conditions was also measured by phase-Doppler technique.
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해저에서 TNT 폭발에 의한 Fire-Ball의 팽창과 이에 따른 충격파 전파
곽호영(Ho-Young Kwak),강기문(Ki-Moon Kang),고일곤(Ilgon Ko) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Until now, several empirical models have been proposed to access the damage due to the TNT explosions. A set of analytical solutions for the time dependent radius of expanding fire-ball after detonation by TNT was obtained by solving Euler equations and energy equation with a “polytope” assumption at the fire-ball center. Shock waves developed from the rapidly expanding fire-ball in underwater were obtained by Kirkwood-Bethe hypothesis. The calculated period and maximum radius of bubble developed from the fire-ball due to violent explosion by TNT were compared to the experimental data.
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해저에서 TNT 폭발에 의한 파이어볼의 팽창과 이에 따른 충격파 전파
곽호영(Ho-Young Kwak),강기문(Ki-Moon Kang),고일곤(Ilgon Ko) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.7
지금껏 TNT 폭발에 의한 피해를 계산하는 방법에는 몇 가지 실험에 의한 모델이 제안되었다. 본 논문에서는 fire-ball 중심에서 가스가 단열이라는 가정하에 연속방정식, 오일러 및 에너지 방정식에 대한 해석적 해를 얻어 TNT 가 폭발 후 팽창하는 fire-ball 에 대한 시간에 따른 반경의 변화를 얻었다. 급격히 팽창하는 fire-ball 에 의한 충격파의 전파는 Kirkwood-Bethe 가정에 의해 구하였다. 해저에서 TNT 가 폭발하게 되면 fire-ball 이 생성, 팽창해 기포로 거동하게 된다. 이 기포의 주기와 최대반경에 대한 계산값을 실험 값과 비교한 결과 계산 값은 실험 값과 잘 일치 하였다. Until now, several empirical models for assessing the damage due to TNT explosions have been proposed. A set of analytical solutions for the time-dependent radius of an expanding fire-ball after detonation of TNT was obtained by solving the continuity, Euler (momentum), and energy equations with a “polytrope” assumption at the fire-ball center. The shock waves developed from the rapid expansion of a fire-ball under water were obtained by using the KirkwoodBBethe hypothesis. The calculated period of bubble oscillation and the maximum radius of the bubble resulting from the fire-ball due to a violent underwater TNT explosion were in good agreement with the experimental data.
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