Volumetric Heat Transfer Coefficient in Fluidized‐Bed Dryers

Poós, Tibor; Szabó, Viktor

doi:10.1002/ceat.201700038

Cited by 12 publications

(6 citation statements)

References 21 publications

(22 reference statements)

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“…The effect on the fluid dynamics of a fluidized bed of various parameters was studied: gas injection time into the bed, gas flow velocity and bubbling regime [25], bubble dynamics during nonspherical particles fluidization [26], continuous injection of the central air jet into the bed [27], and features of the pseudo-two-dimensional two-zone gas-solid fluidized bed [28], from the features of solid particles and gas bubbles [29]. Researchers also paid attention to the study of the interphase heat transfer intensity between particles and the gas flow [30] and heat transfer to heat exchange surfaces located in the layer [31][32][33][34]. The research in [31] studied the effect on the heat transfer of the gas flow uneven distribution, which led to the heat transfer intensification due to the higher packet updating frequency.…”

Section: Literature Reviewmentioning

confidence: 99%

Multistage Shelf Devices with Fluidized Bed for Heat-Mass Transfer Processes: Experimental Studies and Practical Implementation

et al. 2021

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The article deals with the theoretical description and experimental study of the hydrodynamic and heat transfer properties regarding the operation of multistage gravitational devices of the fluidized bed with inclined perforated shelves. The peculiarities of the work and the implementation field of the multistage shelf units are described. A theoretical model to define the solubilizer’s velocity above the perforation holes, in the above-shelf space of the device and in the outloading gap, as well as the residence time of the dispersed phase at the stage (perforated shelf contact) of the device is presented. The results of experimental studies regarding the influence, made by the structural parameters of the perforated shelf contacts, on the distribution pattern of single-phase and gas-dispersed flows in the workspace of the device, on the intensity of interphase heat transfer are presented. The conditions to create active hydrodynamic operating modes of multistage gravitational shelf devices, which provide higher efficiency of heat-mass transfer processes, and with lower gas consumption and hydraulic resistance compared to typical fluidized bed devices, are proved. Peculiarities regarding the implementation of heat-mass transfer processes in multistage devices are described using heat treatment and drying processes as examples.

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Section: Literature Reviewmentioning

confidence: 99%

Multistage Shelf Devices with Fluidized Bed for Heat-Mass Transfer Processes: Experimental Studies and Practical Implementation

et al. 2021

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“…A volumetric heat transfer coeffi cient was applied for modeling fl uidized bed dryers in our previous work. Based on our measurements and literature data a modifi ed Nu' = f (Re) relationship was created for fl uidized bed drying [16]:…”

Section: Nu-re Relationshipmentioning

confidence: 99%

“…In case of gas fl ow through a granulate layer, the shape resistance is negligible compared to friction resistance, therefore the analogy of heat, mass, and momentum transfer can be applied. Based on similarities of temperature, concentration, and velocity profi les, the heat transfer and mass transfer factors [16]: j q = j m . Based on the interpretation of the heat and mass transfer factors:…”

Section: Variation Of the Absolute Humidity Of Gasmentioning

confidence: 99%

Determination of entry length of a fluidized bed dryer using volumetric heat transfer coefficient

Poós

Szabó

2017

IRASE

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Fluidized bed dryers are widely used in several fi elds of industry. Suffi ciently accurate thermal models provide an opportunity to increase the effectiveness of dryers. The required size of a fl uidized bed dryer can be defi ned with the application of mathematical model. This work is aimed at developing mathematical model to investigate the infl uence of operating parameters in a fl uidized bed dryer using volumetric heat transfer coeffi cient. After the defi ning the input parameters of the differential equations, the required entry length of the dryer which effective heat and mass transfer between gas and particles takes place can be estimated. The correct estimation of the entry length is useful in optimal design of a fl uidized bed dryer. Using the model the impact of the drying parameters can be determined to the required length. Keywords: fl uidized bed dryer, heat and mass transfer, volumetric heat transfer coeffi cient, mathematical model

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“…Depending on the size of the fluidizing column, they can supply or remove significant amounts of heat. As long as the gas flow sufficiently mixes the bed, the bed's temperature is relatively consistent, both axially and radially [12]. The area at which heat is transferred from the bed to a heat-exchanging wall surface is an important consideration.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Coefficients in Air-Solid Fluidized Bed Using Vertical Heating Element

Faraj,

Ali,

Najim

2023

ETJ

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Volumetric Heat Transfer Coefficient in Fluidized‐Bed Dryers

Cited by 12 publications

References 21 publications

Multistage Shelf Devices with Fluidized Bed for Heat-Mass Transfer Processes: Experimental Studies and Practical Implementation

Multistage Shelf Devices with Fluidized Bed for Heat-Mass Transfer Processes: Experimental Studies and Practical Implementation

Determination of entry length of a fluidized bed dryer using volumetric heat transfer coefficient

Heat Transfer Coefficients in Air-Solid Fluidized Bed Using Vertical Heating Element

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