Fluidization of fine particles at reduced pressure

Kusakabe, Katsuki; Kuriyama, T.; Morooka, Shigeharu

doi:10.1016/0032-5910(89)80024-5

Cited by 58 publications

(19 citation statements)

References 11 publications

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“…Under reduced pressure, the minimum fluidization velocity can be obtained by some equations (Kusakabe et al, 1989;Llop et al, 1996). In this study, we adopted the equation of Kusakabe et al, because the calculated results by the equation of Kusakabe et al were in good agreement with our experimental data:…”

Section: Physical Properties Of Particle Bedsupporting

confidence: 75%

“…To enhance the heat transfer rate into the material, the fluidized bed was combined with vacuum drying in this study. Some workers have studied the fluidization characteristics under reduced pressure (Kusakabe et al, 1989;Noda et al, 1994;Llop et al, 1996;Mawatari et al, 2003Mawatari et al, , 2004, and it was found that the fluidization state is observed at even less than 1 kPa. For the particulate materials, Kozanoglu et al (2002) have examined the drying characteristics in the fluidized bed under reduced pressure.…”

Section: Introductionmentioning

confidence: 97%

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Drying characteristics of porous material immersed in a bed of hygroscopic porous particles fluidized under reduced pressure

Tatemoto

Tsunekawa

Yano

et al. 2007

Chemical Engineering Science

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Section: Physical Properties Of Particle Bedsupporting

confidence: 75%

Section: Introductionmentioning

confidence: 97%

Drying characteristics of porous material immersed in a bed of hygroscopic porous particles fluidized under reduced pressure

Tatemoto

Tsunekawa

Yano

et al. 2007

Chemical Engineering Science

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“…(1). [13] Although some equations were suggested to calculate the minimum fluidization velocity under reduced pressure, we adopted the equation …”

Section: Methodsmentioning

confidence: 99%

“…Some workers have studied the fluidization characteristics under reduced pressure, [13][14][15][16][17] and it is found that the fluidization state is observed at even less than 1 kPa. For the particulate materials, Kozanoglu et al [18] have examined the drying characteristics in the fluidized bed under reduced pressure.…”

Section: Introductionmentioning

confidence: 97%

Effect of Fluidizing Particle on Drying Characteristics of Porous Materials in Superheated Steam Fluidized Bed under Reduced Pressure

et al. 2008

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The hygroscopic porous particle was used as the fluidizing particle for the superheated steam fluidized bed drying under reduced pressure. A relatively large material was immersed in the fluidized bed as the drying sample. The drying characteristics of the sample were examined experimentally and the results were compared with those in the case of inert particle fluidized bed.The water transfer from the sample to the fluidizing particle bed in the case of hygroscopic porous particle facilitated the drying regardless of pressure and temperature in the drying chamber. The increment degree of the sample temperature at the earlier period of drying was smaller in the case of hygroscopic porous particle than in the case of inert particle, and the phenomenon was more remarkable in the case of superheated steam than in the case of hot air. INTRODUCTIONThe quality of a dry product is strongly affected by the drying process. During the drying process, heat-sensitive materials such as food and pharmaceuticals must be kept at low temperature. The freeze dryer is used for such materials, but the long drying time and the large amount of energy are necessary for the drying. Therefore, the development of a dryer that has low drying temperature, high drying rate, and high energy efficiency is required for heat-sensitive materials.Under reduced pressure, the material temperature in drying becomes lower. Under extremely low pressure, however, the convective heat transfer rate from the drying gas to the material is low and the drying time becomes much

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“…4 Kusakabe et al observed that fine particles were smoothly fluidized at reduced pressures. 5 Generally, the fluidized bed reactor is favorable to treat powders because of the uniformity in the bed and the ability of continuous powder handling. 6 Therefore, all powders can be uniformly treated at the fluidized bed plasma reactor.…”

Section: Introductionmentioning

confidence: 99%

Surface crosslinking of high‐density polyethylene beads in a modified plasma reactor

Kim

Choi

2002

J of Applied Polymer Sci

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High-density polyethylene (HDPE) beads were successfully surfacecrosslinked in a modified plasma reactor. The modified plasma reactor treats large amounts of beads, which are uniformly surface-crosslinked. In this study, effects of the gas pressure, radio-frequency (RF) power, and the treatment time on the degree of surface crosslinking were systematically investigated. Degree of surface crosslinking was measured by solvent extraction method (boiling xylene method, BXM). The gel content of plasma-treated HDPE increases from 0.0 to 1.05% within 10 min at 100 mTorr, 200 W. FTIR and DSC analyses show that the crosslinked layer after plasma treatment is limited only at HDPE surface without changing the bulk thermal property of HDPE. Through the analysis of FTIR, it was confirmed that main peaks corresponding to CH 2 bands were decreased and two peaks corresponding to CF 2 and CF 3 were observed after plasma surface modification.

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Fluidization of fine particles at reduced pressure

Cited by 58 publications

References 11 publications

Drying characteristics of porous material immersed in a bed of hygroscopic porous particles fluidized under reduced pressure

Drying characteristics of porous material immersed in a bed of hygroscopic porous particles fluidized under reduced pressure

Effect of Fluidizing Particle on Drying Characteristics of Porous Materials in Superheated Steam Fluidized Bed under Reduced Pressure

Surface crosslinking of high‐density polyethylene beads in a modified plasma reactor

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