CFD Modelling of Natural Convection Heat and Mass Transfer in Hygroscopic Porous Media

Prakash, Mahesh; Turan, Ozden; Li, Y.; Thorpe, Graham

doi:10.1080/07373930008917837

Cited by 8 publications

(6 citation statements)

References 16 publications

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“…[14][15][16][17][18] A few numerical simulations have been presented to study on natural convection heat and moisture transfer in a cavity partially filled with hygroscopic porous medium. [19][20] In those papers, the effect of laminar or turbulent convection in an overlying fluid layer on heat and moisture transfer in enclosures was considered, and the results were obtained for a rectangular storage bin with a fluid layer overlying hygroscopic porous medium. [19][20] However, the effect of surface thermal radiation on heat and moisture transfer in enclosures was neglected, which maybe result in a deviation of the results from the facts.…”

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confidence: 99%

“…[19][20] In those papers, the effect of laminar or turbulent convection in an overlying fluid layer on heat and moisture transfer in enclosures was considered, and the results were obtained for a rectangular storage bin with a fluid layer overlying hygroscopic porous medium. [19][20] However, the effect of surface thermal radiation on heat and moisture transfer in enclosures was neglected, which maybe result in a deviation of the results from the facts. radiation and Rayleigh numbers that affect the natural convection, temperature and moisture distributions is also conducted.…”

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confidence: 99%

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Natural convection heat and moisture transfer with thermal radiation in a cavity partially filled with hygroscopic porous medium

et al. 2015

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This paper deals with natural convection heat and moisture transfer with thermal radiation in a cavity partially filled with hygroscopic porous medium. The governing equations for the momentum and heat transfer in both free fluid and hygroscopic porous medium and moisture content transfer in hygroscopic porous medium were solved by the finite element method. The radiative heat transfer is calculated by making use of the radiosity of the surfaces that assumed to be grey. Comparisons with experimental and numerical results in the literature have been carried out. Effects of thermal radiation, Rayleigh number on natural convection and heat transfer in both free fluid and porous medium and moisture content transfer in porous medium were analyzed. It was found that surface thermal radiation can significantly change the temperature and moisture content fields in the regions of free flow and porous medium. The mean temperature at the interface decreases, and the temperature and moisture content gradients are created on the upper two corners of the porous medium region and the moisture content in the porous medium decreases in the porous medium as Ra increases. Downloaded by [University of Otago] at 13:16 28 July 2015 2

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confidence: 99%

Section: Please Scroll Down For Articlementioning

confidence: 99%

Natural convection heat and moisture transfer with thermal radiation in a cavity partially filled with hygroscopic porous medium

et al. 2015

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“…CFD applications to simulate fluid flow in porous media have a broad range of applications from oil basin simulation 10 to modeling corn seed drying. 11 In all cases, the results depend on an appropriate geometrical model, mesh definition, and the selection of a turbulence model (when considered necessary). There have been few CFD studies in fixed beds due to complex factors such as geometry definition and heat and mass transfer modeling, in addition to limitations in computational power.…”

Section: Introductionmentioning

confidence: 99%

CFD Flow and Heat Transfer in Nonregular Packings for Fixed Bed Equipment Design

Guardo

Coussirat

Larrayoz

et al. 2004

Ind. Eng. Chem. Res.

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This work aims to test the application of computational fluid dynamics (CFD) modeling to fixed bed equipment design. Studies of CFD with a fixed bed design commonly use a regular packing approach to define bed geometry. However, assuming nonregular packing is a more realistic way to simulate the behavior of a fixed bed and therefore to estimate important design parameters. As a fluid flow simulation tool, CFD allows us to obtain a more accurate view of the fluid flow and heat transfer mechanisms present in fixed bed equipment. Forty-four spheres stacked in a nonregular maximum-space-occupying arrangement in a cylindrical container were used as the geometrical model. Estimates of the pressure drop along the bed, and wall heat transfer parameters were chosen as validation parameters. ΔP, Nu w, and k r/k f are given for different values of Re (transition and turbulent flow), and they are compared to commonly used correlations. Air was chosen as the flowing fluid. Cases of laminar and turbulent flows are presented, and their results are compared. To account for the fluid flow and thermally fluctuating components in the turbulent cases, one- and two-equation turbulence models were used for simulation.

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“…The case study of Prakash et al [32] is moisture migration in a rectangular cavity (2 m in height and 1 m in diameter) with half the cavity filled with silica gel and their paper presents a general method of solving heat and moisture transfer by analysing a two layer system with a fluid overlying a hygroscopic porous medium where turbulence in the fluid layer affect the natural convection flow. Also, these approaches are of interest for applications of formulation of EPNs if the phenomenon is scaled adequately to small containers in which GBs are deposited for storage, transportation and commercialization, because they permit air in the container to contact the exposed surfaces of the packages for oxygen exchange with EPNs [58,59].…”

Section: Natural Convection In Cavitiesmentioning

confidence: 99%

“…Based on natural convection theory, heat and mass transfer from porous media in quiescent fluid environments have been extensively studied by its importance in the design or performance of the systems when it is desirable to minimize heat transfer rates or to minimize operating costs [32].…”

Section: Natural Convection Theorymentioning

confidence: 99%

Moisture Evaporation from Granular Biopesticides Containing Quiescent Entomopathogenic Nematodes

Cortés-Martínez¹,

Ruiz-Vega²,

Martínez-Gutiérrez³

2017

Current Perspective to Predict Actual Evapotranspiration

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The moisture evaporation process from granular biopesticides (GBs) containing entomopathogenic nematodes (EPNs) has influence in the shelf-life of these biological products, but the approach to design GBs with desired transport properties lacks of theoretical support to get closer in a better way to formulations design of long-term storage. In this chapter we review the state of art in theoretical studies about the physics of the moisture evaporation to elucidate what are the mechanisms of drying of GBs. We found that several external and internal factors influence the transport process of moisture exchange among others phenomenon that happened in a porous media such as GBs; consequently, complex and highly dynamic interactions between medium properties, transport processes, and boundary conditions result in a wide range of evaporation behaviors. The theory of drying process in two stages for porous materials with high moisture content seems to be a good starting point to explore further the drying of GBs at different scales and mechanistic and correlative models of evaporation are available to analyze the desiccation in different stages of the elaboration process, which is also of interest in the subject area of science and technology of the formulation of EPNs.

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CFD Modelling of Natural Convection Heat and Mass Transfer in Hygroscopic Porous Media

Cited by 8 publications

References 16 publications

Natural convection heat and moisture transfer with thermal radiation in a cavity partially filled with hygroscopic porous medium

Natural convection heat and moisture transfer with thermal radiation in a cavity partially filled with hygroscopic porous medium

CFD Flow and Heat Transfer in Nonregular Packings for Fixed Bed Equipment Design

Moisture Evaporation from Granular Biopesticides Containing Quiescent Entomopathogenic Nematodes

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