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삼상 유동층내에서의 기포 분쇄 및 수역학적 특성

Hydrodynamics and Bubble Breakage in Three Phase Fluidized Beds

HWAHAK KONGHAK, December 1979, 17(6), 407-418(12), NONE
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Abstract

삼상(액체-기체-고체) 유동층 및 삼상 유동층내에 기포를 분쇄할 목적으로 혼합한 부동물질이 함유된 층내의 각상의 체유량을 비교적 넓은 범위의 유속 조건에서 측정하였다. 실험은 직경이 25.4 ㎝인 유동층 반응기에서 행하여졌다.
유체의 속도, 입자의 크기, 부동물질의 모양 및 부동물질과 입자의 체적비가 각상의 체유량 및 층기공률(층팽창)에 어떠한 영향이 있는가를 구명하였다.
유동층내의 입자와 부동물질의 체적비가 10 % 이상인 경우의 삼삼 유동계에서는 부동물질이 기포를 현저하게 분쇄함을 알았으나 체적비가 10 % 이하인 경우에는 부동물질이 기포를 분쇄하는 효과가 크지 못함을 알 수 있었다.
실험결과는 입자의 Reynolds 및 Froude Number 및 부동물질과 입자간의 표면적비의 함수의 실험식으로 나타내었다.
The individual phase holdups in three(liquid-gas-solid) phase fluidized bed and the bed of particles with floating contactors(cylindrical or spherical) for breaking bubbles have been measured over a wide range of liquid and gas velocities. Experiments were carried out in a 25.4 ㎝-diameter fluidized bed.
The effects of fluid velocity, particle size, shape of floating contactors and volume ratio of floating contactors to solid particles on bed porosity and phase holdups were determined.
Beds of particles and floating contactors having a volume ratio exceeding 10 % were found to have a significant bubble breaking potential. In contrast, beds of particles and floating contactors having the ratio below this value were found to have insignificant bubble breaking potential.
The data were correlated empirically by equations involving particle Reynolds and Froude numbers and surface ratio of floating contactors to particles.

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