Heat Transfer Between a Gas Fluidized Bed and Immersed Tubes

Saxena, S.C.; Grewal, N.S.; Gabor, J.D.; Zabrodsky, S.S.; Galershtein, D. M.

doi:10.1016/s0065-2717(08)70087-x

Cited by 80 publications

(28 citation statements)

References 43 publications

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“…The heat transfer coefficient between the bed material and the tube was then calculated according to the following energy balance equation: The figure indicates that in the bubbling zone the heat transfer coefficient increases and then decreases with the air flow rate. This observation is in good agreement with those made by other investigators (Saxena et al, 1978). The increase of the heat transfer coefficient at low air flow rates is mainly due to the increase in particle movement; the decrease at high air flow rates, however, is due to the decrease in particle density.…”

Section: Experimental Methodssupporting

confidence: 93%

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Characteristics of grid zone heat transfer in a gas‐solid fluidized bed

Wang

Hopper

1987

AIChE Journal

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Section: Experimental Methodssupporting

confidence: 93%

“…It appears that the heat transfer coefficient with smaller particles is slightly higher than that with larger particles. Note that this trend is in agreement with that observed in the bubbling zone by other investigators (Saxena et al, 1978).…”

Section: Eflect Of Particle Sizesupporting

confidence: 93%

Characteristics of grid zone heat transfer in a gas‐solid fluidized bed

Wang

Hopper

1987

AIChE Journal

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“…The findings are consistent with the experiments with non-magnetic beds with immersed tubes (Botterill, 1975;Saxena et al, 1978) and the excellent experiments of Kellogg et al (1983) with a flat surface.…”

Section: Local Heat Transfer Coefficients Between a Bed And An Immerssupporting

confidence: 90%

MAGNETIC FIELD ASSISTED FLUIDIZATION – A UNIFIED APPROACH Part 3: Heat Transfer in Gas-Solid Fluidized Beds - a critical re-evaluation of the results

Hristov¹

2003

Reviews in Chemical Engineering

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“…Thus, any possible variations of the local heat transfer coefficient with the tangential angle [28] are taken into account. Therefore, the temperature T w is the mean value of these 9 measurements.…”

Section: Materials and Experimental Apparatusmentioning

confidence: 99%

Experimental heat transfer coefficients between a surface and fixed and fluidized beds with PCM

Izquierdo-Barrientos

Sobrino

Almendros-Ibáñez

2015

Applied Thermal Engineering

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This work presents an experimental study to determine the capacity of a phase change material (PCM) in granular form to be used in fixed and bubbling fluidized beds for thermal energy storage. The experimental measurements are focused on determination of the heat transfer coefficient between a heated surface immersed in the bed and the granular PCM. The flow rate is varied to quantify its influence on the heat transfer coefficient. The PCM used is Rubitherm GR50 with a phase change temperature of approximately 50• C. The PCM is available in two different particle sizes, 0.54 mm and 1.64 mm, of which the finer is used in the fluidized bed and the coarser is used in the fixed bed. In addition, the results obtained for the PCM are compared with the heat transfer coefficients measured for sand, a material commonly used for thermal storage. * Corresponding author. NOTICE: this is the author's version of a work that was accepted for publication in Applied Thermal Engineering. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Applied Thermal Engineering 78 (2015) pp. 373-379. doi:10.1016/j.applthermaleng.2014.12.044 In comparing the heat transfer coefficients for fixed and fluidized beds, the heat transfer coefficients in the fluidized bed with PCM are nearly three times higher than those for the fixed bed at the same gas flow rate. This increase in the heat transfer is a result of two main factors: first, the continuous renewal of PCM particles from the heated surface when they are fluidized, and second, the large quantities of energy in latent form absorbed by the PCM. In the fixed bed there is no renovation of particles, consequently only a small percentage of particles are able to change its phase. Hence, there is no increase in the heat transfer coefficient due to this fact.

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Heat Transfer Between a Gas Fluidized Bed and Immersed Tubes

Cited by 80 publications

References 43 publications

Characteristics of grid zone heat transfer in a gas‐solid fluidized bed

Characteristics of grid zone heat transfer in a gas‐solid fluidized bed

MAGNETIC FIELD ASSISTED FLUIDIZATION – A UNIFIED APPROACH Part 3: Heat Transfer in Gas-Solid Fluidized Beds - a critical re-evaluation of the results

Experimental heat transfer coefficients between a surface and fixed and fluidized beds with PCM

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