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HWAHAK KONGHAK,
Vol.34, No.1, 58-63, 1996
Vol.34, No.1, 58-63, 1996
삼상유동층에서 고체 유동입자의 축방향 분산
Axial Dispersion of Fluidized Solid Particles in Three-Phase Fluidized Beds
직경 15.2cm의 아크릴 관으로 된 삼상유동층에서 유동입장의 축방향 분사특성을 고찰하였다. 분산계수는 크기가 다른 두 가지 입자 유동층의 혼합영역에서 각 입자의 농도를 구하여 이를 축방향 분산모델에 적용하여 구하였다. 실험변수로는 기체 및 액체의 유속 그리고 유동입자의 크기 등을 선택하였으며 이들 변수들이 유동입자의 축방향 분산계수에 미치는 영향을 고찰하였다. 실험결과 유동입자의 축방향 분산계수는 기체유속과 유동입자의 크기가 증가함에 따라 증가하였고, 액체유속의 증가에 따라서는 최대값을 나타내었다. 삼성유동층에서 유동입자의 분산계수는 실험변수와 등반난류 모델에 의한 상관식으로 나타내었다.
Axial dispersion characteristics of fluidized solid particles have been investigated in a three phase fluid-ized bed of 0.152m ID. The axial dispersion coefficient has been estimated by resorting to the axial dispersion model of fluidized particles with the knowledges of particle concentrations in the mixing region of fluidized bed of binary mixture. The flow rates of gas and liquid phase and particle size have been selected as operating variables, and effects of them on the dispersion coefficient of fluidized particles have been discussed. It has been found that the dispersion coefficient increases with increases in the gas flow rate and particle size, but it exhibits the maximum value with the variation of liquid flow rate. The dispersion coefficient has been correlated in terms of operating variables and by means of isotropic turbulence model.
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