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혼합입자 삼상유동층내의 상체유량 특성에 관한 연구

Phase Holdup Characteristics of Three Phase Fluidized Beds of Mixed Particles

HWAHAK KONGHAK, October 1980, 18(5), 375-384(10), NONE
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Abstract

두 개의 다른 크기의 입자를 혼합한 삼상 유동층에서의 각 상의 체유량을 측정하였다.
삼상유동층에서 적은 균일입자를 액체로 유동화시킨 후 기체를 주입하였을 때 층 높이 감소 현상이 여러 경우의 혼합입자 층에서는 관찰되지 않았다. 혼합입자의 무게비 변화에 따라서 층기공률 및 액상 체유량은 최저값을 보여 주었다.
혼합입자 유동층에서의 최저 유동화 속도는 균일입자의 경우보다 상대적으로 낮은 것으로 나타났다. 실험결과는 무차원군인 유체의 Reynolds 및 Froude numbers로써 harmonic 평균입자 크기를 근거로하여 상관식을 얻었으며 이 실험식은 삼상 유동층내의 균일입자 및 혼합입자 경우의 층기공률 및 액상 체유량 등을 산출하는데 유용할 것이다.
Individual phase holdups were measured in three phase fluidized beds of mixed particles having binary size distributions.
The bed contraction phenomena, which have been observed in the beds of small monosized particles, could not be found for some mixtures of solid particles at the same experimental conditions. The variation of bed porosity and liquid phase holdups showed miniumm values depending upon the variation of weight fraction of the component particles.
The minimum fluidizing velocity of the mixed particle systems was comparatively lower than that of the large particle component only.
Results were summarized with dimensionless correlations, in terms of fluid Reynolds and Froude numbers based on harmonic mean particle diameter, which can be applicable to both monosized and mixed particle systems.

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