Comparison of CFD–DEM heat transfer simulations with infrared/visual measurements

Patil, AV Amit; Peters, E.A.J.F.; Kuipers, J.A.M.

doi:10.1016/j.cej.2015.04.131

Cited by 110 publications

(55 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A threshold value of 0.32 (converted image intensity from 0-1, where 0 and 1 indicate the minimum and maximum, respectively) can be used to differentiate between the particles and the background. As reported by [17], this value can be found by trial and error. However, by using this method for each particle in the bed, a small halo of pixels with a higher temperature than the surroundings is observed.…”

Section: Ir Counts [-]mentioning

confidence: 67%

“…1 helps to limit the heat loss through conduction to the environment. PMMA can also reduce the interference relate to an increase of the temperature of the back plate during the experiments (C p = 1466 J/ kg/K) compared to the aluminum plate (k = 205 W/m/K and C p = 900 J/kg/K) used in the earlier work of [17]. Particles are heated-up due to the heat of adsorption, while the whole column also increases its temperature from room temperature.…”

Section: Experimental Set-upsmentioning

confidence: 99%

“…The visual and infrared cameras were connected to the computer system via a trigger box. The cameras are triggered to take images simultaneously according to a preselected signal, of which details can be found in [17,24]. The two images taken by IR and visual cameras can be combined to use the position of particles to correct the thermal image such that only IR radiation from the particle phase is included.…”

Section: Optical Apparatusmentioning

confidence: 99%

“…Both emissivity and shape of the object can affect the radiation emitted. We adopted a similar way of camera calibration as proposed by [17]. A bed of zeolite 13X particles of 1.8-2.0 mm diameter was heated up to 200°C in an external oven and transferred into the bed, where one zeolite 13X particle attached to a thermocouple was placed close to the front observation window.…”

Section: Ir Camera and Calibrationmentioning

confidence: 99%

“…However, the validation was conducted by studying a cooling process of glass beads without heat production. In this work, we extend the work of [17] to include heat production in the particles. In order to mimic the heat production in the exothermic polymerization, a model system was used.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Experimental and simulation study of heat transfer in fluidized beds with heat production

Janssen

Buist

et al. 2017

Chemical Engineering Journal

Self Cite

View full text Add to dashboard Cite

h i g h l i g h t sHeat production in a fluidized bed by CO 2 adsorption on Zeolite 13X. Combined infrared/visual camera (PIV-DIA-IR) technique for studying heat transfer. Extensive validation though a combined CFD-DEM model. Key aspects of adsorption process studied with TGA and STA. a r t i c l e i n f o b s t r a c tAs a result of highly exothermic reactions during gas-phase olefin polymerization in fluidized bed reactors, difficulties with respect to the heat management play an important role in the optimization of these reactors. To obtain a better understanding of the particle temperature distribution in fluidized beds, a high speed infrared (IR) camera and a visual camera have been coupled to capture the hydrodynamic and thermal behavior of a pseudo-2D fluidized bed. The experimental data were subsequently used to validate an in-house developed computational fluid dynamics and discrete element model (CFD-DEM). In order to mimic the heat effect due to the exothermic polymerization reaction, a model system was used. In this model system, heat is released in zeolite 13X particles (1.8-2.0 mm, Geldart D type) due to the adsorption of CO 2 . All key aspects of the adsorption process (kinetics, equilibrium and heat effect) were studied separately using Thermogravimetric Analysis (TGA) and Simultaneous Thermal Analysis (STA), and subsequently fluidized bed experiments were conducted, by feeding gas mixtures of CO 2 and N 2 with different CO 2 concentrations to the bed, where the total heat of liberation could be controlled. The combined infrared/visual camera technique generated detailed information on the thermal behavior of the bed. Furthermore, the comparison of the spatial and temporal distributions of the particle temperature measured in the fluidized bed with the simulation results of CFD-DEM provides qualitative and quantitative validation of the CFD-DEM, in particular concerning the thermal aspects.

show abstract

Section: Ir Counts [-]mentioning

confidence: 67%

Section: Experimental Set-upsmentioning

confidence: 99%

Section: Optical Apparatusmentioning

confidence: 99%

Section: Ir Camera and Calibrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations