Convective mass transfer coefficient for a hydrodynamically developed airflow in a short rectangular duct

Iskra, Conrad R.; Simonson, Carey J.

doi:10.1016/j.ijheatmasstransfer.2006.10.026

Cited by 45 publications

(22 citation statements)

References 22 publications

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“…The air was preconditioned before it entered the test section and an upstream developing section ensured a fully developed flow pattern. For the case of Re=2000 the airflow pattern was assumed to be laminar in accordance to [19]. A 2D structured grid was used, counting 33,800 rectangular cells.…”

Section: Reference Casementioning

confidence: 99%

Sensitivity analysis of CFD coupled non-isothermal heat and moisture modelling

Belleghem

Steeman

et al. 2010

Building and Environment

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Section: Reference Casementioning

confidence: 99%

Sensitivity analysis of CFD coupled non-isothermal heat and moisture modelling

Belleghem

Steeman

et al. 2010

Building and Environment

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“…V, is the wind velocity, l is the air viscosity and L is the characteristic length of the test chamber. The density of the moist air at the free surface is estimated as the sum of the partial densities of vapor (q v,s ) and dry air (q a,s ) as [19]:…”

Section: Mathematical Calculationsmentioning

confidence: 99%

“…Analogy theory states that convective heat and mass transfer are completely analogous phenomena under certain conditions [8]. Based on this theory, the convective heat transfer correlations in the form of the Nusselt number can be employed to evaluate the mass transfer rate if the Prandtl number is replaced by the Schmidt number and the Grashof number replaced by the mass transfer Grashof number [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Experimental comparison of the ability of Dalton based and similarity theory correlations to predict water evaporation rate in different convection regimes

2012

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This paper investigates the ability of two widely used evaporation models: Dalton based correlations and similarity theory results by comparing with experimental measurements. A series of experimental investigations are carried out over a wide range of water temperatures and air velocities for 0.01 B Gr/Re 2 B 100 in a rectangular heated pool. The results show that for forced convection regime satisfactory results can be achieved by using the modified Dalton correlations, while, due to ripples appear on the water free surface, similarity theory under predicts the evaporation rate. In the free convection regime, Dalton based correlations even with modification are not able to predict acceptable results. For mixed convection regime, although both the similarity theory and Dalton based correlations without modification are not able to predict the mild non-linearity behavior between water evaporation rate and vapor pressure difference, but they obtain relatively satisfactory results. A dimensionless correlation using the experimental data of all convection regimes is proposed to cover different water surface geometries and air flow conditions. List of symbolsD H 2 o;Air Binary mass diffusion coefficient m 2 /s D h Hydraulic diameter of rectangular duct (m) g Gravitational acceleration m/s 2 g m;H 2 o Mass transfer coefficient Gr Mass transfer Grashof number H Height of rectangular duct (m) h fg Enthalpy of vaporization (J/kg) k Thermal conductivity w/mk L Length of water pan (m) _ m e Evaporation rate of water kg/m 2 h m f H 2 o

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“…by Iskra et al [42]. In these tests both the evaporation rate from the tray of water and the vapour density difference between the air stream and the surface of water are measured.…”

Section: Wind Tunnel Experiments -Convection Coefficient Experimentsmentioning

confidence: 99%

Benchmark experiments for moisture transfer modelling in air and porous materials

Belleghem

Steeman

Willockx

et al. 2011

Building and Environment

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Abstract.The presence of hygroscopic materials has a large impact on the moisture balance of buildings. Nowadays, HAM (Heat, Air and Moisture) models are widely used to investigate the role of hygroscopic materials on the performance of buildings, i.e. on the building envelope, the indoor climate and valuable objects stored within the building. Recently, these HAM models are being coupled to CFD models to study the moisture exchange between air and porous materials on a local scale (microclimates), or to BES (Building Energy Simulation) models which focus on the interaction between air and porous materials at building level. Validation of these numerical codes is essential to gain confidence in the codes. However, available experimental data are rather scarce. This paper describes the design of a new test facility for humidity experiments. A dedicated AHU system is used to provide well-controlled air (constant temperature and RH) to an airtight and well-insulated room-size test chamber. In one of the walls of the chamber a calcium silicate sample is installed. A step in RH of the supply air is imposed. Temperature and RH of the supply air, the room air and on various depths inside the sample are continuously registered during the experiments. Two types of experiments were carried out to validate a coupled CFD-HAM model and a coupled BES-HAM model. The temperature outside the test chamber was controlled and there was no temperature difference imposed across the chamber walls. Comparing the models with the measured data gave satisfactory agreement.

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Convective mass transfer coefficient for a hydrodynamically developed airflow in a short rectangular duct

Cited by 45 publications

References 22 publications

Sensitivity analysis of CFD coupled non-isothermal heat and moisture modelling

Sensitivity analysis of CFD coupled non-isothermal heat and moisture modelling

Experimental comparison of the ability of Dalton based and similarity theory correlations to predict water evaporation rate in different convection regimes

Benchmark experiments for moisture transfer modelling in air and porous materials

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