Characterizing Fluidization by the Bed Collapsing Method

Yang, Ziping; Tung, Yuanki; Kwauk, Mooson

doi:10.1080/00986448508911672

Cited by 22 publications

(23 citation statements)

References 6 publications

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“…In the second stage, the discrete gas flow out of bed gradually and the bed height decrease relatively slowly. In the third stage, particles compact under gravity and the bed height decrease very slowly [26]. From Fig.…”

Section: Fluidization Regimementioning

confidence: 93%

Experimental study on the fluidization behaviors of the superfine particles

Liu

Zhang

Chen

et al. 2015

Chemical Engineering Journal

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Section: Fluidization Regimementioning

confidence: 93%

Experimental study on the fluidization behaviors of the superfine particles

Liu

Zhang

Chen

et al. 2015

Chemical Engineering Journal

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“…Why choose a TFBR cold system to understand the fluidization behavior? Although CNTs are synthesized at a high temperature, so many scholars have adopted a cold system to investigate the fluidization behavior of CNTs. ,,, In addition, other particle materials using cold fluidized beds have also been studied by many researchers. − ,,,,,− ,− So, the study method is feasible and can withstand investigation. In the actual elevated temperature condition, as detailed in our previous study, the carbon source (propylene), H 2 , and N 2 are used in the TFBR without a distributor.…”

Section: Methodsmentioning

confidence: 99%

Research on Fluidization Performance of Different Tapered Fluidized Bed Reactors for Fluidizing Carbon Nanotubes

Bai

Chu

Wang

et al. 2020

Ind. Eng. Chem. Res.

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In this work, the tapered fluidized bed reactor (TFBR) without a distributor is used for the first time in the production of carbon nanotubes (CNTs), in which, the periodic motion process of CNT particles is elaborated through visual and image observations. The fluidization behavior and quality of the agglomerated multiwalled carbon nanotubes (MWCNTs) (@A) and vertical array MWCNTs (@V) in TFBRs with/without a distributor and with different tapered angles are carefully studied, including C1 (60°), C2 (25°), and C3 (11°). The performances of different TFBRs are evaluated qualitatively and quantitatively by using the bed collapse method and the dimensionless time Θ. Results show that the tapered angle of C3 in the TFBR with a distributor is beneficial to fluidize CNTs, and the fluidization behavior of CNT particles can be changed by varying the tapered angle of TFBRs. The results of fluidization quality ( ) in C3-N (without a distributor) and C3 (with a distributor) have shown that C3 @A (0.0.07035) < C3 @A-N (0.1545), C3 @V (0.1479) < C3 @V-N (0.1867), which verify that the fluidization quality of @A and @V particles in the TFBR without a distributor is better than that with a distributor. Furthermore, due to the less requirement of the gas source cost in this study, the TFBR without a distributor technology as a promising technique for mass production of CNTs in a cost-effective way has been confirmed.

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“…The bulk density of the bed continues to decrease, and the fluidization becomes more violent until particles no longer form a bed but are "conveyed" upwards by the gas flow. Stopping the gas flow causes the particle bed to defluidize in three consecutive stages: a rapid initial stage for bubble escape, an intermediate stage of hindered sedimentation with a constant velocity of solids descent, and a final decelerating stage of solids consolidation [30].…”

Section: Fundamentals Of Fluidizationmentioning

confidence: 99%

“…Most have particles with size between 150 µm and 500 µm and density from about 1.4 to 4 g/cm 3 . For these particle beds, once the minimum fluidization velocity is exceeded, the excess gas appears in the form of bubbles; in the defluidization process, the particle beds reach their final state as soon as bubbles are expelled [30]. Group C particles are cohesive or very fine powders.…”

Section: Fundamentals Of Fluidizationmentioning

confidence: 99%

Preparation of Sand Beds Using Fluidization

Jin¹,

Tang²,

Umbanhowar³

et al. 2019

Preprint

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Reconstituting soil beds to a desired density is essential to geotechnical modeling tests. In this study, we apply and assess the method of air fluidization to prepare sand beds for geotechnical engineering studies. Through it, an automated bed preparation process can be realized. The details of device structure and design are presented as a reference for application of the methodology. By quantifying the average and local post-fluidization density of the bed, the performance of the fluidized bed device is characterized. With the addition of vibration and by changing the defluidization rate, the sand can be prepared with volume-based relative densities ranging from 10% to 92%. Local sand density, measured with a cone penetrometer, is nearly uniform across the bed: density variation is less than 13% (coefficient of variation with respect to relative density) for all protocols except for some beds prepared by defluidization only. The variation of local density and penetration resistance measured across the bed breadth is comparable to results from beds prepared by the commonly used method of pluviation. This suggests that sand beds reconstituted using air fluidization are suitable for geotechnical modeling tests.

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Characterizing Fluidization by the Bed Collapsing Method

Cited by 22 publications

References 6 publications

Experimental study on the fluidization behaviors of the superfine particles

Experimental study on the fluidization behaviors of the superfine particles

Research on Fluidization Performance of Different Tapered Fluidized Bed Reactors for Fluidizing Carbon Nanotubes

Preparation of Sand Beds Using Fluidization

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