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A model for predicting transport velocity in gas fluidized-beds
Kim, Daewook,Won, Yoo Sube,Khurram, Muhammad Shahzad,Joo, Ji Bong,Choi, Jeong-Hoo,Ryu, Ho-Jung Elsevier 2018 Advanced powder technology Vol.29 No.12
<P><B>Abstract</B></P> <P>This study improved the model that used the correlation of the particle entrainment rate to determine the transport velocity. It proposed the new absolute value of the local slope as the criterion of the model for locating the transport velocity in the relationship between dimensionless velocity (U/U<SUB>t</SUB>) and the reciprocal of the entrainment rate (1/K<SUB>i</SUB> <SUP>∗+</SUP>). It indicated that the criterion depended on properties of fluidized particles and increased with Archemedes number. The Archemedes number was modified by substituting the critical diameter, the maximum particle diameter at which the sum of the interparticle adhesion forces gave a dominant influence to the particle entrainment rate, for the diameter of particles in case that the mean diameter of particles was smaller than the critical diameter. A correlation was suggested to calculate the absolute value of the local slope at the transport velocity. The new model was successful covering the effect of particle properties in predicting the transport velocity.</P> <P><B>Highlights</B></P> <P> <UL> <LI> This model determined the transport velocity from the correlation of entrainment rate. </LI> <LI> The criterion for locating the transport velocity was proposed. </LI> <LI> The criterion increased with Archimedes number. </LI> <LI> A correlation for the criterion was successful in predicting the transport velocity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Archimedes number versus absolute slope at transport velocity.</P> <P>[DISPLAY OMISSION]</P>
Effects of angle on the transport velocity in an inclined fluidized-bed
Muhammad Shahzad Khurram,최정후,Yoo Sube Won,A Reum Jeong,박영철,류호정,이창근 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.12
The transport velocity (utri) in an inclined fluidized-bed was investigated by varying the bed angle relative to the horizontal plane (0o-90o), the particle diameter (0.021-0.925mm), and density (1,272-4,503 kg/m3). This study employed the emptying time method to determine the transport velocity. The transport velocity for the vertical fluidized- bed (utr90) was revealed to increase appreciably with the aspect ratio of the fluidized-bed. The transport velocity decreased as the bed angle increased. The ratio of the transport velocity to that for the vertical bed (utri/utr90) decreased with an increase in either the bed angle or the ratio of the particle diameter (dp) to the critical particle diameter (dp *), i.e., the maximum particle diameter at which the sum of the interparticle adhesion forces had a dominant influence on particle entrainment. Correlations for the transport velocity according to the bed angle relative to the horizontal plane were proposed successfully, based on the experimental data.
기체 유동층에서 입자 비산속도 상관식에 의한 수송속도의 예측
원유섭,무하매드 샤자드 쿠람,정아름,최정후,류호정,Won, Yoo Sube,Khurram, Muhammad Shahzad,Jeong, A Reum,Choi, Jeong-Hoo,Ryu, Ho-Jung 한국화학공학회 2017 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.55 No.5
기체 유동층에서 입자비산속도에 관한 상관식을 사용하여 입자의 수송속도를 예측하는 모델을 제안하였다. Choi 등과 Li와 Kato의 상관식을 사용하여 emptying time 방법을 모사하였다. 기체속도의 단위에 의한 영향을 배제하기 위해서, 기체속도를 종말속도로 나눈 무차원 속도를 x-축의 값으로 사용하였다. y-축은 입자비산속도의 역수를 사용하였다. 기체속도를 증가시킬 때, y-값의 감소 기울기가 절대값으로 0.398 [$m^2s/kg$]를 나타내는 무차원 속도를 수송속도로 간주하였다. 모델의 예측값은 고온, 고압에서도 측정값과 비교적 잘 일치하였다. A model for predicting the transport velocity was proposed using the correlation of the particle entrainment rate in the gas fluidized bed. The emptying time method was simulated using correlations of Choi et al. and Li and Kato. In order to exclude the influence of the unit of the gas velocity, the dimensionless velocity obtained by dividing the gas velocity by the terminal velocity was used as the value of the x-axis. The inverse of the particle entrainment rate was used as the value of the y-axis. When increasing the gas velocity, the non-dimensional velocity, at which the decreasing slope of the y-value is 0.398 [$m^2s/kg$] in absolute value, was considered as the transport velocity. The transport velocity predicted by the model was in good agreement even at high temperature and high pressure.