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

Laguerre, Onrawee; Amara, S. Ben; Álvarez, G.; Flick, Denis

doi:10.1016/j.applthermaleng.2007.03.014

Cited by 76 publications

(23 citation statements)

References 28 publications

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“…Studies on the heat transfer in the bed are also carried out by Laguerre et al (2006Laguerre et al ( , 2008. In both cases, tests were performed with use of the spherical objects.…”

Section: Indirect Measurement Methodsmentioning

confidence: 99%

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Measurement Approach of Mean Heat Transfer Coefficient for Packed Bed of Vegetables

Łapiński

Butrymowicz

Kolodziejczyk

2017

Acta Mechanica Et Automatica

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Abstract:The non-invasive measurement approach of the mean heat transfer coefficient for the packed bed of vegetables may be thought as still open issue. There is a clear need for the assessment of heat transfer conditions for various types of fruits and vegetables in order to accurately predict the thermal load that is necessary to select refrigeration equipment for cold storage chamber. Additionally, there is significant development in numerical modelling of heat and mass transfer processes in cold storage chambers for fruits and vegetables which requires precise heat transfer prediction. The theoretical basis for the indirect measurement approach of mean heat transfer coefficient for the packed bed of vegetables that is based on single blow technique is presented and discussed in the paper. The approach based on the modified model of Liang and Yang was presented and discussed. The testing stand consisted of a dedicated experimental tunnel along with auxiliary equipment and measurement system are presented. The geometry of the tested vegetables bed were presented. Selected experimental results of heat transfer are presented and discussed for the packed bed of carrots. These results were presented as dimensionless relationship. The obtained results were compared with the existing dimensionless relationships developed for the packed bed consisting of elements of various regular shapes.

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“…Studies on the heat transfer in the bed are also carried out by Laguerre et al (2006Laguerre et al ( , 2008. In both cases, tests were performed with use of the spherical objects.…”

Section: Indirect Measurement Methodsmentioning

confidence: 99%

“…Additionallythey put in the bed two balls: heating and the heated in order to determine of heat conduction in the bed. Laguerre et al (2008) studied heat transfer for the case of natural convection in the bed of balls made of PVC filled with gel.…”

Section: Indirect Measurement Methodsmentioning

confidence: 99%

Measurement Approach of Mean Heat Transfer Coefficient for Packed Bed of Vegetables

Łapiński

Butrymowicz

Kolodziejczyk

2017

Acta Mechanica Et Automatica

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“…Free convection Laguerre et al [4] investigated two modelling approaches of transient heat transfer due to free convection in a packed bed of spheres. The first approach employed computational fluid dynamics software which directly solves the Navier-Stokes equations and the local energy equations in the fluid and solid phase.…”

Section: Convective Heat Transfermentioning

confidence: 99%

Simulation of thermal conversion of solid fuel by the discrete particle method

Peters¹,

Džiugys²,

Navakas³

2011

Lith. J. Phys.

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We introduce the discrete particle method (DPM) that derives from the discrete element method (DEM). This is an advanced numerical simulation tool that takes into account both motion and chemical conversion of granular material, such as coal or biomass, in furnaces in conjunction with computational fluid dynamics (CFD). However, predictions of solely motion or conversion in a decoupled mode are also applicable. The DPM uses object oriented computational techniques that support objects representing three-dimensional particles of various shapes, size, and physical properties of particle material. This makes DPM a highly versatile tool in dealing with a variety of problems related to different industrial applications of granular matter. A review of literature concerning different approaches to mass and heat transfer in packed beds is presented.

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“…It can be effectively used to decouple electricity production and demand, thus meeting random fluctuations in demand and reducing part-load generation in fossil fuel power plants [1,2]. Moreover, TES can be used in numerous commercial and industrial applications, often integrated with conventional energy sources such as advanced adiabatic compressed air energy storage systems (ACAES) [3], thermal-fluid systems [4], gas-cooled nuclear reactors [5], drying processes [6], catalytic reactors [7] and in residential buildings [8].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Research Activity on a Packed Bed TES System

et al. 2016

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This paper presents the results of experimental and numerical research activities on a packed bed sensible thermal energy storage (TES) system. The TES consists of a cylindrical steel tank filled with small alumina beads and crossed by air used as the heat transfer fluid. Experimental tests were carried out while varying some operating parameters such as the mass flow rate, the inlet-outlet temperature thresholds and the aspect ratio (length over diameter). Numerical simulations were carried out using a one-dimensional model, specifically developed in the Matlab-Simulink environment and a 2D axisymmetric model based on the ANSYS-Fluent platform. Both models are based on a two-equation transient approach to calculate fluid and solid phase temperatures. Thermodynamic properties were considered to be temperature-dependent and, in the Computational Fluid Dynamics (CFD) model, variable porosity of the bed in the radial direction, thermal losses and the effective conductivity of the alumina beads were also considered. The simulation results of both models were compared to the experimental ones, showing good agreement. The one-dimensional model has the advantage of predicting the axial temperature distribution with a very low computational cost, but it does not allow calculation of the correct energy stored when the temperature distribution is strongly influenced by the wall. To overcome this problem a 2D CFD model was used in this work.

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

Cited by 76 publications

References 28 publications

Measurement Approach of Mean Heat Transfer Coefficient for Packed Bed of Vegetables

Measurement Approach of Mean Heat Transfer Coefficient for Packed Bed of Vegetables

Simulation of thermal conversion of solid fuel by the discrete particle method

Experimental and Numerical Research Activity on a Packed Bed TES System

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