Synthesis of diamond particles with an acetylene fired circulating fluidized bed

Horio, Masayuki; Saitô, Akio; Unou, K.; Nakazono, H.; Shibuya, Noboru; Shima, Susumu; Kosaka, Akio

doi:10.1016/0009-2509(96)00193-5

Cited by 12 publications

(5 citation statements)

References 5 publications

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“…Chemical vapour deposition (CVD) is a process that can be used to synthesize diamond at much lower temperatures and pressures under non-equilibrium conditions [14]. It has been shown clearly that diamond deposition on circulating suspension is successfully done at a relatively small contact time [19]. To confirm the aforementioned statement, diamond was synthesized using the experimental set-up depicted in Fig.…”

Section: Synthesis Of Diamond Filmsmentioning

confidence: 98%

See 1 more Smart Citation

Thermodynamic stability of graphitic diamond films produced from catalytic chemical vapour deposition reactor

Iyuke

Daramola

Mokena

et al. 2015

Journal of Industrial and Engineering Chemistry

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Section: Synthesis Of Diamond Filmsmentioning

confidence: 98%

“…Since the historical finding of low pressure diamond deposition, a variety of routes to chemical vapour deposition of diamond has been achieved [19]. Chemical vapour deposition (CVD) is a process that can be used to synthesize diamond at much lower temperatures and pressures under non-equilibrium conditions [14].…”

Section: Synthesis Of Diamond Filmsmentioning

confidence: 99%

Thermodynamic stability of graphitic diamond films produced from catalytic chemical vapour deposition reactor

Iyuke

Daramola

Mokena

et al. 2015

Journal of Industrial and Engineering Chemistry

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“…Several novel applications such as nuclear fission [2], diamond synthesis [3] and catalytic oxidation of methane [4], have been proposed in recent years and tested on laboratory scale.…”

Section: Motivationmentioning

confidence: 99%

Convective Heat and Mass Transfer Modeling in Gas-Fluidized Beds

Yusuf¹,

Melaaen

Mathiesen

2005

Chem. Eng. Technol.

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This review examines selected mechanistic and empirical models reported in the literature to predict convective heat and mass transfer coefficients in gas-fluidized beds. The role of hydrodynamics in heat and mass transfer is briefly outlined before embarking on the modeling approaches. Both bed to wall and interphase heat transfer, are considered. In bed to wall heat transfer, the main focus of the review is the modeling of particle convective components, based on surface renewal. The concepts of transient and local heat transfer models are also discussed briefly. In the case of mass transfer, only interphase transfer is considered. Emphasis is placed on models based on combustion where mass transfer is seen to occur from a few active particles contained in a fluidized bed of inert particles.

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“…Fine particles, like Geldart group C particles, are generally believed to agglomerate easily due to strong interparticle forces. − In fact, agglomeration also widely exists in fluidized beds of Geldart group A particles, characterized by clusters in fast fluidized beds and pneumatic transportation and agglomerates in bubbling and turbulent fluidized beds. − Extensive research on particle clustering in the lean-phase particle flow has been conducted, , whereas work associated with particle agglomerating in the dense-phase fluidized beds operated in relatively low gas velocity has been rare. Cocco et al pictured a large number of agglomerates in a bubbling fluidized bed of FCC catalyst and suggested that nearly 41% of FCC catalyst material existed as agglomerates with an average size of 21 ± 1.7 particles.…”

Section: Introductionmentioning

confidence: 99%

Modified Force Balance Model of Estimating Agglomerate Sizes in a Gas–Solid Fluidized Bed

Niu

Chu

Cai

et al. 2019

Ind. Eng. Chem. Res.

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Transient signals of an optical probe were registered in a gas–solid fluidized bed dealing with four kinds of particles, respectively. Particle agglomerates were identified, and the diameters were investigated. The force balance model and the energy balance model are analyzed, but the predictions underestimate the agglomerate diameter because of unsuitable assumptions for FCC particle-formed agglomerates. A modified force balance model is proposed on the basis of imperfect elastic collision, and the restitution coefficient is considered and calculated when calculating the collision force. The predictions are in great agreement with experimental results. A criterion of agglomerate coalescence and breakup is proposed. The effect of the ratio of the diameters of two collision agglomerates is discussed, and the critical ratio for agglomerate coalescence is calculated. The agglomerate strength and tensile stress are calculated, and the agglomerate strength is always greater than the tensile stress, which indicates that agglomerates are almost impossible to break up in collision.

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Synthesis of diamond particles with an acetylene fired circulating fluidized bed

Cited by 12 publications

References 5 publications

Thermodynamic stability of graphitic diamond films produced from catalytic chemical vapour deposition reactor

Thermodynamic stability of graphitic diamond films produced from catalytic chemical vapour deposition reactor

Convective Heat and Mass Transfer Modeling in Gas-Fluidized Beds

Modified Force Balance Model of Estimating Agglomerate Sizes in a Gas–Solid Fluidized Bed

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