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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 1991.5
- 수록면
- 142 - 151 (10page)
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In the present investigation, it has been proposed to utilize a direct contact heat exchanger as an evaporator to solve the difficulties such as scaling, corrosion and law thermal efficiencies, associated with the conventional evaporator. Liquified nitrozen was utilized as a working fluid to investigate basic natures of bubble dynamics in the evaporator, and spray nozzles were adopted to inject liquified nitrozen into the spray column with varying flow rates of dispersed phase fluids. Experimentations were carried out in the range of 6.54×10-⁴㎏/s - 0.030 ㎏/s for dispersed phase flow rates with one, three and five nozzle holes.
Observing the bubble dynamics for the evaporator the feasibility of utilizing a direct contact heat exchanger as a LNG evaporator has been evaluated. The results show that no eruption phenomena was observed in the present investigation with LN₂ and the interface between N₂ bubbles and water was fully turbulent. It is believed that the high injection velocity of LN₂ through the spray nozzles provide good mixing effects for both heat and mass transfers between water and N₂ bubbles. Ice was formed on the surface of the spray nozzle for higher LN₂ flow rates. However, even in this case, it is observed that the ice was detached as soon as it was formed. Under the present experimental conditions, the shapes of LN₂ bubbles were in the spherical-cap region according to the Clift, Grace and Weber Graphs. The height of foam region caused by the breakup of larger bubbles keeps increasing with high injection velocities until it reaches it's maximum height.
Observing the bubble dynamics for the evaporator the feasibility of utilizing a direct contact heat exchanger as a LNG evaporator has been evaluated. The results show that no eruption phenomena was observed in the present investigation with LN₂ and the interface between N₂ bubbles and water was fully turbulent. It is believed that the high injection velocity of LN₂ through the spray nozzles provide good mixing effects for both heat and mass transfers between water and N₂ bubbles. Ice was formed on the surface of the spray nozzle for higher LN₂ flow rates. However, even in this case, it is observed that the ice was detached as soon as it was formed. Under the present experimental conditions, the shapes of LN₂ bubbles were in the spherical-cap region according to the Clift, Grace and Weber Graphs. The height of foam region caused by the breakup of larger bubbles keeps increasing with high injection velocities until it reaches it's maximum height.
목차
ABSTRACT
1. 서론
2. 실험장치 및 실험방법
3. 실험결과 및 고찰
4. 결론
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