Numerical study of the interaction among a pair of blunt plates subject to convective drying – A conjugate approach

Lamnatou, Chr.; Papanicolaou, E.; Belessiotis, V.; Κyriakis, Ν.

doi:10.1016/j.ijthermalsci.2010.06.017

“…De Bonis et al [37] developed a finite element model using a commercial finite element package to study the performance of the drying process of fresh-cut vegetables. Lamnatou et al [38,39] developed a finite volume model to study the drying of apple slices. Finally a hybrid approach is reported in literature.…”

Section: Numerical Modelling: Coupling Ham With Cfdmentioning

confidence: 99%

Validation of a coupled heat, vapour and liquid moisture transport model for porous materials implemented in CFD

Belleghem

¹

,

Steeman

²

,

Janssen

³

et al. 2014

Building and Environment

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Moisture-related damage is an important issue when looking at the performance of building envelopes. In order to accurately predict the moisture behaviour of building components, building designers can resort to Heat, Air and Moisture (HAM) models. In this paper a newly developed heat and mass transfer model that is implemented in a 3D finite volume solver, Fluent®, is presented. This allows a simultaneous modelling approach of both the convective conditions surrounding a porous material and the heat and moisture transport in the porous material governed by diffusion. Unlike most HAM models that often confine to constant convective transport coefficients it is now possible to better predict these convective boundary conditions. An important application of the model is the convective drying of porous building materials. Especially during the first drying stage, the drying rate is determined by the convective boundary conditions. The model was validated against a convective drying experiment from literature, in which a saturated ceramic brick sample is dried by flowing dry air over one side of the sample surface. Temperature and relative humidity measurements at different depths in the sample, moisture distribution profiles and mass loss measurements were compared with simulation results. An overall good agreement between the coupled model and the experiments was found, however, the model predicted the constant drying rate period better than the falling rate period. This was improved by adjusting the material properties. The adjustment of the material properties was supported by neutron radiography measurements.

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“…The process usually takes place in equipment or units called dryers. Dryers continue to be a topic of interest for either to improve quality [4,5,6], productivity [7] or energy efficiency [5,7,8].…”

Section: Introductionmentioning

confidence: 99%

“…The heat and mass transfer in the drying process have been modelled in many ways and for different types of dryers and materials [4,5,[7][8][9][11][12][13][14]. Grains are not dried individually; they are packed forming a porous medium [17].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Optimization of continuous mixed-flow grain dryers by constructal theory

Stanescu¹,

Risso²

2016

IJHT

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Energy rational use has been extensively studied in the past fifty years but the challenge of optimal use of energy resources continues. This paper is about artificial grain drying, an intensive energy consuming industrial process. Constructal Theory guided the search of the superior limits of grain drying. By maximizing the utilization of drying gas moisture removal and carrying capability, we address the fundamental problem of determining the best strategies to minimize the specific energy consumption. Results shed some light on sizing drying chambers for given conditions. The drying gas moisture carrying capability almost doubled while the drying gas mass flow rate decreased six times. Numerical values of thermal efficiency indicate a potential improvement of the grain drying process from 14.28% for constant drying air delivery, up to 27.53% when the best variable drying air delivery strategy is employed.

show abstract

“…The heat and mass transfer in the drying process have been modelled in many ways and for different types of dryers and materials [4,5,[7][8][9][11][12][13][14]. Grains are not dried individually; they are packed forming a porous medium [17].…”

Section: Introductionmentioning

confidence: 99%

Optimization of continuous mixed-flow grain dryers by constructal theory

Stanescu¹,

Risso²

2016

IJHT

View full text Add to dashboard Cite

Energy rational use has been extensively studied in the past fifty years but the challenge of optimal use of energy resources continues. This paper is about artificial grain drying, an intensive energy consuming industrial process. Constructal Theory guided the search of the superior limits of grain drying. By maximizing the utilization of drying gas moisture removal and carrying capability, we address the fundamental problem of determining the best strategies to minimize the specific energy consumption. Results shed some light on sizing drying chambers for given conditions. The drying gas moisture carrying capability almost doubled while the drying gas mass flow rate decreased six times. Numerical values of thermal efficiency indicate a potential improvement of the grain drying process from 14.28% for constant drying air delivery, up to 27.53% when the best variable drying air delivery strategy is employed.

show abstract

Numerical study of the interaction among a pair of blunt plates subject to convective drying – A conjugate approach

Cited by 10 publications

References 52 publications

Validation of a coupled heat, vapour and liquid moisture transport model for porous materials implemented in CFD

Validation of a coupled heat, vapour and liquid moisture transport model for porous materials implemented in CFD

Optimization of continuous mixed-flow grain dryers by constructal theory

Optimization of continuous mixed-flow grain dryers by constructal theory

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