Heat transfer and hydrodynamics of particles mixture in swirling fluidized bed

Tawfik, Mohamed Hamam M.; Diab, Mohamed Refaat; Abdelmotalib, Hamada

doi:10.1016/j.ijthermalsci.2019.106134

Cited by 15 publications

(10 citation statements)

References 10 publications

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“…This situation will be discussed in more detail (Part 2 -The Air Flow Characteristics). On the other hand, as indicated by Tawfik et al, [7], the RNG 𝑘-𝜀 model offers better agreement in the region of the annular blade distributor.…”

Section: Turbulence Model Selectionmentioning

confidence: 74%

“…A grid sensitivity study was carried out in order to find an appropriate meshing method that produces minimal computational errors due to truncation and round-off error while taking less time to compute. Logic dictates that a finer mesh will have a smaller truncation error but a greater roundoff error, resulting in a longer calculation time [7]. In ANSYS Fluent, five distinct meshing schemes were created, labelled A, B, C, D, and E, each with a different number of cell elements.…”

Section: Grid Independence Studymentioning

confidence: 99%

“…In addition, the inclusion of the component in its 𝜀 equation would significantly improve the accuracy for flows subjected to fast strain and provide an analytical formula for turbulence Prandtl numbers. It is also applicable to the RNG model's swirl and turbulence condition [7,10].…”

Section: Fig 5 Velocity Distribution At Various Number Of Turbulence ...mentioning

confidence: 99%

“…Moreover, it has the capacity to fluidize Geldart Type-D particles, which are often large and difficult to fluidize [4]. As a result of these advantages, SFB has become the most effective technology for several applications, including as heat transfer and bed dynamics, drying process, new modern application and many other [5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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Twist Blade Distributor in Fluidization Systems: Part 1 – The Computational Procedure

Alias

Nawi

Sarip

et al. 2023

ARASET

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Flowing gas in fluidized bed through selected inlet distributor may imparts a drag effect on the particles, would cause an increase in gas flow, that maybe sufficient to rearrange the particles movement. Thus, study on the airflow in a fluidization system through numerical analysis has been conducted to investigate the airflow distribution affected by new model distributor of twist blade distributor configuration. The present study would emphasis on computational procedure and parametric study via ANSYS Fluent before a detailed study on selected twist blade distributor are conducted. The selected parametric study on the twist blade distributor configuration whereby the twist blade angle (100°), horizontal inclination angle (15°), radial inclination angle (10°) and number of blades (60) was carried out. Therefore, the results of the studies that have been carried out meet the expected standards based on previous studies.

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Section: Turbulence Model Selectionmentioning

confidence: 74%

Section: Grid Independence Studymentioning

confidence: 99%

Section: Fig 5 Velocity Distribution At Various Number Of Turbulence ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Twist Blade Distributor in Fluidization Systems: Part 1 – The Computational Procedure

Alias

Nawi

Sarip

et al. 2023

ARASET

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“…It was found that the most influences variable on the heat transfer coefficient was the diameter of particles; meanwhile a small influence was found from the solid thermal conductivity and fluid velocity. Tawfik et al [4] experimentally investigated a swirling fluidized bed reactor, the hydrodynamic parameters of the bed, and the heat transfer of the bed mixture was studied. They used polyethylene (PE) beads (Geldart type-D).…”

Section: Introductionmentioning

confidence: 99%

Effect of Wall Heat Transfer on the Fluidization Process

Ridha¹,

Al-Azawy²

2021

IJHT

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The fluidized bed and the fluidization process and characteristics were studied in this paper numerically using Computational Fluid Dynamics (CFD) Ansys Fluent 15.0. Constant temperature was applied to both sides of the two-dimensional fluidized bed geometry. The superficial velocity of the working fluid ranged amid (0.08 – 0.5 m/s) and the initial height of the solid particles changed amid (0.05, 0.1, 0.2 m). Aluminum particles and water was used as working materials within the fluidized bed. The model used for the investigations was validated using Ngoh and Lim research results. The results showed that the fluidization head increases as the water inlet superficial velocity increases. As well as when the water inlet superficial velocity increases, the average solid phase temperature increases.

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Effects of Excess Air and Energy Fraction on Heat Transfer for Co-firing of Eucalyptus Bark and Peanut Shell Blended Fuel in a Twin-Cyclonic Swirling Fluidized-Bed Combustor

Sirisomboon,

Sopamart,

Srisamran

2024

Korean J. Chem. Eng.

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Biomass plays an important role in mitigating greenhouse gas (GHG) emissions. However, the major problem in using biomass is that inconsistent amounts are available throughout the year. The use of mixed fuels is one way to solve this problem. Based on the lumped system analysis method, this experimental study investigated the effects of excess air and energy fraction on the heat transfer coe cients of co-ring eucalyptus bark (EB) and peanut shell (PNS) in a twin-cyclonic swirling uidizedbed combustor (TS-FBC). The blended fuel was red at a xed heat rate for various energy fractions of secondary fuel (EF 2 ) and excess air (EA). The radial and axial heat transfer coe cients were observed: the average heat transfer coe cient of each operating condition showed signi cant effects for EA, while the effect for EF 2 was not obvious. The heat transfer coe cient could be improved by up to 11% in the bed region and by as much as 22% in the freeboard area when EA was increased from 40-80%.

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Heat transfer and hydrodynamics of particles mixture in swirling fluidized bed

Cited by 15 publications

References 10 publications

Twist Blade Distributor in Fluidization Systems: Part 1 – The Computational Procedure

Twist Blade Distributor in Fluidization Systems: Part 1 – The Computational Procedure

Effect of Wall Heat Transfer on the Fluidization Process

Effects of Excess Air and Energy Fraction on Heat Transfer for Co-firing of Eucalyptus Bark and Peanut Shell Blended Fuel in a Twin-Cyclonic Swirling Fluidized-Bed Combustor

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