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난류유동층으로의 전이속도 및 흐름영역

Transition Velocity to Turbulent Fluidized Bed and Flow Regime

남궁원 김성원 김상돈^†

Won NamKung Sung Won Kim Sang Done Kim^†

한국과학기술원 화학공학과 및 에너지환경연구센터, 대전 305-701

Department of Chemical Engineering and Energy & Environment Research Center, Korea Advanced Institute of Science and Technology, Taejon 305-701, Korea

kimsd@kaist.ac.kr

HWAHAK KONGHAK, August 2000, 38(4), 523-528(6), NONE

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Abstract

기체 유동층(직경 0.1m, 높이 5.3m)에서 FCC 입자를 유동화시킬 때의 압력변동을 측정하여 기포 유동층에서 난류 유동층으로의 전이속도(U_c를 측정하였다. 또한 기상유속에 따른 고체 체류량 기울기의 변화로부터 전이속도를 결정하였다. 층 팽창을 이용하여 (U_c)를 예측할 수 있는 모델을 제시하였으며 이 모델에 의하여 예측된 값은 실험값과 잘 일치하였다. Archimedes number와 Reynolds number를 이용하여 유동층 내 각각의 영역을 예측할 수 있는 흐름 영역도를 제시하였다.

Transition velocity (U_c)from bubbling to turbulent fluidized bed has been determined by pressure fluctuation in a gas fluidized bed(0.1 m i.d. and 5.3 m high)of FCC particles with variation of gas velocity. Also, the transition velocity(U_cto turbulent fluidized bed is determined from the gradient variation of solid holdup with gas velocity. A model based on the bed expansion is proposed to predict U_c

Keywords

Transition Velocity Bed Expansion Model Flow Regime Map

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