CFD modelling and experimental validation of particle-to-fluid mass and heat transfer in a packed bed at very low channel to particle diameter ratio

Romkes, S.J.P; Dautzenberg, Frits M.; Bleek, C.M. van den; Calis, H.P.A.

doi:10.1016/j.cej.2003.08.026

Cited by 170 publications

(55 citation statements)

References 19 publications

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“…Moreover, they studied fluid flow and heat transfer inside fixed beds (Logtenberg and Dixon, 1998) Several other papers examined the heat transfer in packed beds. Romkes et al (2003) performed a study on mass and heat transfer using CFD modeling and experimental validation for a composite structured catalytic reactor packing with a low N value. Guardo (2005) discussed wall-to-fluid heat transfer in packed beds using different turbulence models.…”

Section: Introductionmentioning

confidence: 99%

Micro Scale Heat Transfer Comparison between Packed Beds and Microfibrous Entrapped Catalysts

Sheng

Gonzalez

Yantz

et al. 2013

Engineering Applications of Computational Fluid Mechanics

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Computational Fluid Dynamics (CFD) was used to compare the micro scale heat transfer inside a packed bed and a microfibrous entrapped catalyst (MFEC) structure. Simulations conducted in stagnant gas determined the thermal resistance of the gas in the micro gaps between the particle-to-particle contact points in the resistance network model of a packed bed. Tube to particle diameter ratios for the simulations were 9 based on particle diameter and 27 for MFEC based on surface area average diameter. The maximum temperature difference used in the simulations was 80°C. It was shown that thermal resistance at the contact points accounted for 90% of the thermal resistance of the solid path. In the MFEC, the thermal resistance of the continuous metal fibers was relatively smaller than that of contact points. As a result, 97.2% of the total heat flux was transported by continuous fiber cylinders, which was the fundamental function of fibers on improving the heat transfer of MFEC structures. Enhanced heat transfer characteristics of MFEC were further demonstrated by simulations performed in flowing gas, where both heat conduction and heat convection were significant.

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Section: Introductionmentioning

confidence: 99%

Micro Scale Heat Transfer Comparison between Packed Beds and Microfibrous Entrapped Catalysts

Sheng

Gonzalez

Yantz

et al. 2013

Engineering Applications of Computational Fluid Mechanics

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“…Table 1 Considering the fluid phase around one sphere, the ratio between the mean cell volume and the void space is 1/2400. This ratio is the same order as the one used in other cited studies [4][5][6]. A slightly coarser mesh was also used and gave similar results.…”

Section: Modelling With the Direct Cfd Approachmentioning

confidence: 53%

Transient heat transfer by free convection in a packed bed of spheres: Comparison between two modelling approaches and experimental results

Laguerre

Amara

Álvarez

et al. 2008

Applied Thermal Engineering

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“…Logtenberg and Dixon [21] investigated wall heat transfer coefficient, Nu number, and the radial effective thermal conductivity ratio in 3D geometry of pseudorandomly stacked spheres in a cylindrical channel. Calis et al [22] and Romkes et al [23] investigated the flow and heat transfer characteristics in composite structured packed beds of spheres with CFD and experimental methods, and the CFD results show good agreement with experimental data and they also demonstrate that the effects of packing forms on macroscopic flow and heat transfer characteristics were remarkable.…”

Section: Introductionmentioning

confidence: 68%

Pore Scale Thermal Hydraulics Investigations of Molten Salt Cooled Pebble Bed High Temperature Reactor with BCC and FCC Configurations

Song

Xiang-Zhou

Liu

et al. 2014

Science and Technology of Nuclear Installations

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The present paper systematically investigated pore scale thermal hydraulics characteristics of molten salt cooled high temperature pebble bed reactor. By using computational fluid dynamics (CFD) methods and employing simplified body center cubic (BCC) and face center cubic (FCC) model, pressure drop and local mean Nusselt number are calculated. The simulation result shows that the high Prandtl number molten salt in packed bed has unique fluid-dynamics and thermodynamic properties. There are divergences between CFD results and empirical correlations' predictions of pressure drop and local Nusselt numbers. Local pebble surface temperature distributions in several default conditions are investigated. Thermal removal capacities of molten salt are confirmed in the case of nominal condition; the pebble surface temperature under the condition of local power distortion shows the tolerance of pebble in extreme neutron dose exposure. The numerical experiments of local pebble insufficient cooling indicate that in the molten salt cooled pebble bed reactor, the pebble surface temperature is not very sensitive to loss of partial coolant. The methods and results of this paper would be useful for optimum designs and safety analysis of molten salt cooled pebble bed reactors.

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CFD modelling and experimental validation of particle-to-fluid mass and heat transfer in a packed bed at very low channel to particle diameter ratio

Cited by 170 publications

References 19 publications

Micro Scale Heat Transfer Comparison between Packed Beds and Microfibrous Entrapped Catalysts

Micro Scale Heat Transfer Comparison between Packed Beds and Microfibrous Entrapped Catalysts

Transient heat transfer by free convection in a packed bed of spheres: Comparison between two modelling approaches and experimental results

Pore Scale Thermal Hydraulics Investigations of Molten Salt Cooled Pebble Bed High Temperature Reactor with BCC and FCC Configurations

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