Axial gas dispersion in a fluidized bed of polyethylene particles

Cho, Hong Il; Chung, Chong-Pyoung; Han, Gui Young; Ahn, Gui Ryong; Kong, Jong Su

doi:10.1007/bf02699043

Cited by 19 publications

(9 citation statements)

References 20 publications

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“…In addition, with increasing the liquid flow rate (liquid velocity), liquid MRT decreases, and apparently it seems that the mixing regime of liquid became nearly plug flow. The variance of the obtained curves for empty bed is more than those for a fixed bed, and the variance of obtained curves for fixed bed is more than those for a fluidized bed that was also found by Cho et al [20].…”

Section: Efect Of Liquid Velocity On Pressure Dropsupporting

confidence: 56%

“…3(a) shows the mean residence time of the liquid phase (t m ) obtained from the RTD data. As particle Reynolds number increased, mean residence time decreased [20]. The variation in ADC of liquid phase with particle Reynolds number is shown in Fig.…”

Section: Efect Of Liquid Velocity On Pressure Dropmentioning

confidence: 90%

“…The ADC was varied between 4.63 and 12.47 cm 2 /s in the fixed [20] and Kim et al [21]. On the other hand, the effect of liquid velocity, which was not considered in variance, was included in the ADC.…”

Section: Efect Of Liquid Velocity On Pressure Dropmentioning

confidence: 99%

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Influence of high density particles in reduction of axial dispersion in liquid fluidized bed with residence time distribution curve studies

Behin

Shojaeimehr

2011

Korean J. Chem. Eng.

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Liquid phase RTD curves were investigated in classical fixed and fluidized bed regimes with high density particles. The effect of liquid velocity was studied on bed hydrodynamics. Using an impulse tracer injection technique in a column of 5 cm inner diameter and 1.2 m height, liquid RTD, mean residence time (MRT), axial dispersion coefficient (ADC) and vessel dispersion number (N D ) were determined. ADC increases with liquid superficial velocity. It varied from 4.63 to 20.7 cm 2 /s for the particle Reynolds number of 43 to 279, respectively. The experimental results show that the hight density particles cause less ADC than the low density particles at an identical Reynolds number.

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Section: Efect Of Liquid Velocity On Pressure Dropsupporting

confidence: 56%

Section: Efect Of Liquid Velocity On Pressure Dropmentioning

confidence: 90%

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Influence of high density particles in reduction of axial dispersion in liquid fluidized bed with residence time distribution curve studies

Behin

Shojaeimehr

2011

Korean J. Chem. Eng.

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“…The bed aspect ratio has a significant influence on solid mixing [51,52] and gas dispersion [53] in a bubbling fluidized bed, indicating the interaction between of the two phases changing with the amount of bed materials. Hence the interphase mass transfer rate may also change accordingly.…”

Section: Effect Of Bed Inventorymentioning

confidence: 99%

Emulsion phase expansion of Geldart a particles in bubbling fluidized bed methanation reactors: A CFD–DEM study

Zhang

Zhao

et al. 2015

Powder Technology

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“…Besides the importance of the mass transport inside the porous catalyst, the external resistance to the mass transfer, which is usually defined by the mass transfer coefficient, strongly depends on the flow fluid field around the particles. Most researches have tried to experimentally and theoretically determine the effect of fluid flow on the fixed or fluidized performance [1,2].…”

Section: Introductionmentioning

confidence: 99%

CFD modeling of the effect of absorbent size on absorption performance of a packed bed column

Rahimi

Mohseni

2008

Korean J. Chem. Eng.

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This paper reports a study on the ability of the computational fluid dynamics (CFD) modeling for analyzing the fluid flow hydrodynamics and absorption in a packed bed column. The water absorption by silica gel absorbents in an experimental packed bed was investigated, and the absorption performance of two different sizes of absorbent was studied. A series of experiments were carried out for five setups which are different in the weight ratio of the employed big to small absorbents. The CFD modeling was carried out for all five experimental setups. The predicted results show that by more replacing of the big absorbents with the small ones the water absorption increased. On the other hand, a greater pressure drop was observed as more small absorbents were used. The predicted absorption rates were compared with the measured values and on average a consistency within 11.6% was observed.

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Axial gas dispersion in a fluidized bed of polyethylene particles

Cited by 19 publications

References 20 publications

Influence of high density particles in reduction of axial dispersion in liquid fluidized bed with residence time distribution curve studies

Influence of high density particles in reduction of axial dispersion in liquid fluidized bed with residence time distribution curve studies

Emulsion phase expansion of Geldart a particles in bubbling fluidized bed methanation reactors: A CFD–DEM study

CFD modeling of the effect of absorbent size on absorption performance of a packed bed column

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