A generalized bubble diameter correlation for gas‐solid fluidized beds

Horio, Masayuki; Nonaka, Akira

doi:10.1002/aic.690331113

Cited by 169 publications

(83 citation statements)

References 23 publications

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“…7 Thus, even though the Harrison et al criterion can be useful for an estimation of the fluidization homogeneity, the collective interaction between bubbles through splitting-coalescence mechanism can ultimately lead to equilibrium bubble sizes larger than Harrison's maximum stable size as seen in experiments. 12 Note, however, that the Harrison criterion conforms to the Wilhelm & Kwauk empirical criterion (Eq. 1) if the Froude number is defined based on the terminal settling velocity of an individual particle (Fr 0 5 v 2 p0 /(gd p )).…”

Section: Introductionmentioning

confidence: 78%

Fluidization of fine and ultrafine particles using nitrogen and neon as fluidizing gases

et al. 2007

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in Wiley InterScience (www.interscience.wiley.com).When fluidized by a gas, some agglomerated fine and ultrafine particles display a regime of uniform, nonbubbling fluidization known as agglomerate particulate fluidization (APF). The agglomeration of micrometric sized particles, or simple pre-existing agglomerates in the case of nanoparticles, is governed by the balance between hydrodynamic shear forces and interparticle attractive forces. From this balance the theoretical scaling law Bo g $ k D12 has been derived, where Bo g , the granular Bond number, is the ratio of the interparticle attractive force to particle weight, k is the ratio of agglomerate to particle size, and D is the fractal dimension. In the experimental program the behavior of gas-fluidized beds of fine and ultrafine particles as affected by the use of neon and nitrogen as fluidizing gas is studied. The experimental results indicate that there is no relevant distinction between the sizes of agglomerates fluidized with the different gases as theoretically predicted. However, it is seen that the relatively small increment of gas viscosity opens up a new window of highly expanded agglomerate particulate fluidization (APF) behavior with a delayed onset of bubbling. For a sufficiently high-gas viscosity, and/or smaller particle size, full suppression of the bubbling regime is observed. For nanoparticles exhibiting agglomerate bubbling fluidization (ABF) behavior, where bed expansion is small, and bubbling occurs soon after minimum fluidization, we also observe a delayed onset of bubbling when fluidizing with a gas of higher viscosity.

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Section: Introductionmentioning

confidence: 78%

Fluidization of fine and ultrafine particles using nitrogen and neon as fluidizing gases

et al. 2007

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“…For group A particles, where both bubble coalescence and splitting are important, Horio and Nonaka's correlation 26 is more appropriate and is thus chosen in the present work for the estimation of bubble size.…”

Section: Fluid-dynamic Modelmentioning

confidence: 99%

“…According to Horio and Nonaka, 26 the initial bubble diameter for a porous plate must be calculated by using the equation given in Table 1, but results obtained by this equation for the experimental conditions used in this work forecast an initial bubble diameter that is too small (Ͻ0.05 mm). Since the initial bubble diameter must be at least as large as the particle diameter (0.2 mm), the initial bubble diameter was varied between 0.2 and 2 mm, the best results being obtained for a value of 0.5 mm.…”

Section: Fluid-dynamic Modelmentioning

confidence: 99%

Modeling of fluidized bed reactors with two reaction zones

et al. 2006

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“…These low voidages support to rise the bubbles faster than the inlet superficial velocity. Increase or decrease of bubble diameter depends on the balance of coalescence and splitting frequencies (Horio M & Nonaka A, 1987). Group-B particle showed higher mixing than Group-A particles due to the more bubbles in the bed.…”

Section: Pressure Gradientmentioning

confidence: 99%

Proceedings of the 58th Conference on Simulation and Modelling (SIMS 58) Reykjavik, Iceland, September 25th – 27th, 2017

2017

Linköping Electronic Conference Proceedings

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Welcome to the 58th Conference on Simulation Modelling and Optimization in Reykjavik, Iceland. Reykjavik is the northernmost and one of the smallest capital cities in the world. Although small for a capital, it is the country's largest and most populated city and with the urban area population of around 200000, it is the home of the vast majority of Iceland's people. The city is pioneer in the use of geothermal energy to provide low-cost heating and electricity. Iceland's energy consumption per capita is among the highest in the world, and the proportion of this consumption provided by renewable energy sources exceeds most other countries. The electricity is produced almost entirely from renewable energy sources, hydroelectric (70%) and geothermal (30%) and simulation, modelling and optimization are the key elements to utilize the renewable energy more efficiently.The SIMS 58 will cover broad aspects of simulation, modelling and optimization and be a technical forum for participants to further their knowledge by being exposed to diverse topics, and exchange opinions and ideas both from industry and academia in a variety of topics related to simulation, modelling and optimization. The ambition is to bring the field of applied modelling and simulation techniques of energy systems to the general public as a contributing technology for efficient and sustainable energy systems. This year, the conference program contains two keynote speakers, 53 research papers and presentations organized into 14 sessions and an excursion to a geothermal park.The focus of the conference is on simulation, modelling and optimization in a variety of applied contexts including topics such as geothermal, hydro and bio energy, oil production, automotive industry and methodology and technologies for simulation, modelling and optimization.A key component of the SIMS conference is the opportunity to socialize and make new connections. The conference offers several possibilities such as a conference dinner at Bryggjan Brugghús (Bistro and Brewery), an excursion to the Reykjanes GEOPARK and last but not least some coffee and lunch breaks.SIMS stands for the Scandinavia Simulation Society with members from five Nordic countries, Denmark, Finland, Norway, Sweden and Iceland. The goal of SIMS is to develop further the science and practice of modelling and simulation in all application areas and to be a forum for information interchange between professionals and non-professionals in the Nordic countries.Thanks to all participants, authors, keynote speakers and presenters for their contribution to this conference. I also want to acknowledge the support I have received from the conference board, program committee and the SIMS board. The support from the National energy authority, Iceland is gratefully acknowledged.Welcome, I hope you will enjoy the conference and the interactions with your colleagues and other presenter here.Magnus Excursion:The conference excursion will be on Wednesday, September 27 th , at 10:00. Resource Park in the Reykjanes pen...

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A generalized bubble diameter correlation for gas‐solid fluidized beds

Cited by 169 publications

References 23 publications

Fluidization of fine and ultrafine particles using nitrogen and neon as fluidizing gases

Fluidization of fine and ultrafine particles using nitrogen and neon as fluidizing gases

Modeling of fluidized bed reactors with two reaction zones

Proceedings of the 58th Conference on Simulation and Modelling (SIMS 58) Reykjavik, Iceland, September 25th – 27th, 2017

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