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역 유동층에서 입자의 층 팽창에 관한 수학적 모델
A Mathematical Model for Bed Expansion in an Inverse Fluidized Bed
HWAHAK KONGHAK, October 1994, 32(5), 680-685(6), NONE
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Abstract
역 유동층에서 입자직경이 0.0965-0.219 cm이고 입자밀도가 0.2-0.705g/㎤인, 물보다 가벼운 styrofoam입자 14종류를 이용하여 층 팽창에 관한 실험을 행하여, 이를 Galileo number에 대한 terminal Reynolds number의 관계를 표현하는 2가지 종류의 model들에 적용시켰다. Expansion index, n 의 경우, 실측한 결과와 2가지 model들에 의해 예측한결과들은 유사하게 나타났고, ε=1일 때의 공탑액체속도, Ui와 terminal Reynolds number, Ret의 경우에서도 2가지 model의 결과들은 모두 실험결과에 비교적 근접하여, 층 팽창도 서로 거의 일치하였다. Model 1은 Ret의 구분에 의해 개별적으로 사용되었으나, model 2는 Ret의 제한없이 간결하게 적용가능하였다.
Fourteen different styrofoams having diameter range from 0.0965 to 0.1219cm and density range between 0.2 and 0.705g/㎤ were used to investigate bed expansion characteristics in a inverse fluidized bed. Two models for predicting bed expansion were examined and compared with the experimental data. The expansion index, n, was little difference between the predicted values from the two models and the measured values. In the view of U, the predicted values of the two models were well agreed with the experimental data. Model 2 could be more concisely applied to predict the bed expansion without restriction of Ret.
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Nikov I, Karamanev D, AIChE J., 37, 781 (1991)
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Davison JF, Harison D, "Fluidization," Academic-Press, New York, 37 (1977)
Kim DS, Park YS, Choi YC, Song SK, HWAHAK KONGHAK, 32(4), 566 (1994)
