Heat and mass transfer along a wetted porous plate in an air stream

Belhamri, Azeddine; Fohr, Jean‐Paul

doi:10.1002/aic.690420705

Cited by 17 publications

(17 citation statements)

References 19 publications

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“…g T    g q (11) where λ g is the thermal conductivity of moist air. The enthalpies are defined as:…”

Section: Conservation Of Energymentioning

confidence: 99%

“…This decrease in drying rate results in a temperature increase since less heat is required for the evaporation of water. During the DDRP, the convective boundary conditions are less critical by which a lower accuracy of the CTCs does not necessarily disturb a reliable simulation [11].…”

Section: Introductionmentioning

confidence: 99%

“…As a result, detailed conjugate experiments for forced convective drying of (un)saturated porous materials (e.g. [11]) are very scarce, as acknowledged by other researchers [13,32,33]. Such experiments are still an active topic of ongoing research (e.g.…”

mentioning

confidence: 99%

“…Particularly mass transfer is more difficult to measure accurately at high spatial resolution, compared to heat transfer [5,11]. As a result, detailed conjugate experiments for forced convective drying of (un)saturated porous materials (e.g.…”

mentioning

confidence: 99%

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Analysis of convective heat and mass transfer coefficients for convective drying of a porous flat plate by conjugate modelling

Defraeye

Blocken

Carmeliet

2012

International Journal of Heat and Mass Transfer

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Defraeye T., Blocken B., , Analysis of convective heat and mass transfer coefficients for convective drying of a porous flat plate by conjugate modelling, International Journal of Heat and Mass Transfer 55 (1-3), 112-124. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2011. does not require knowledge of convective transfer coefficients (CTCs) but allows determining the CTCs aposteriori, hence identifying their spatial and temporal variability, which is the main focus of this study.Comparison is made with porous-material modelling using spatially and/or temporally constant CTCs. Both spatial and temporal variations of the convective boundary conditions are found to have a distinct impact on the drying behaviour: the spatial CTC variation results in two-dimensional drying of the porous material due to leading-edge effects; the temporal CTC variation identifies distinct maxima in the drying rates at the surface right before the surface dries out locally. The CTCs obtained with conjugate modelling remain approximately constant during the constant and decreasing drying rate period (CDRP and DDRP, respectively), but a distinct variation is noticed at the transition of CDRP to DDRP. The heat and mass transfer analogy is found to be valid during the CDRP and to a lesser extent during the DDRP but large discrepancies are found during the transition of CDRP to DDRP. The advantages of conjugate modelling are indicated in this study but the need for detailed modelling of convective boundary conditions is however strongly dependent on the drying behaviour of the porous material and is not always required. Nomenclature

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“…g T    g q (11) where λ g is the thermal conductivity of moist air. The enthalpies are defined as:…”

Section: Conservation Of Energymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Analysis of convective heat and mass transfer coefficients for convective drying of a porous flat plate by conjugate modelling

Defraeye

Blocken

Carmeliet

2012

International Journal of Heat and Mass Transfer

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“…For completeness, we analyzed the potential role of shortwave radiation on surface temperature dynamics and evaporation rates during drying of porous surfaces (an ingredient missing in most laboratory drying experiments) [e.g., Shahraeeni and Or , ; Belhamri and Fohr , ]. For standardized comparison, we introduce a dimensionless surface temperature ( T * ) defined by mean temperature of the evaporating surface under full saturation

[\bar{T} (θ_{s})]

, the air flow temperature ( T ∞ ), and mean surface temperature during evaporative drying

(\bar{T})

expressed as

T^{*} = \frac{\bar{T} - T_{\infty}}{\bar{T} (θ_{s}) - T_{\infty}}

…”

Section: Resultsmentioning

confidence: 99%

Temperature dynamics during nonisothermal evaporation from drying porous surfaces

Aminzadeh

2013

Water Resources Research

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[1] The partitioning of incoming shortwave radiative energy on evaporative surfaces determines mass and energy exchange with the atmosphere, and influences measurements of various climatic and hydrologic processes. We quantified the coupling between an evaporative flux from a drying porous surface and the corresponding surface temperature dynamics. The analytical approach employs a pore-scale diffusion model for the evaporative flux from a unit cell (representing the porous surface) based on Schl€ under's (1988) model. The evaporation flux from the unit cell's pore was linked with other components of the surface energy balance through heat exchange across the pore's solid walls. Model predictions for evaporative flux and associated mean thermal fields during the drying of porous surfaces were in good agreement with experimental results. The model was used to predict the so-called soil evaporation transfer coefficient (h a ), yielding good agreement with measurements. Analysis shows that commonly assumed interfacial isothermal conditions (where surface and air temperatures are similar) may yield 15-40% overestimation in evaporation rates relative to nonisothermal conditions (where evaporation rates affect surface temperature). Theoretical results indicate that when shortwave radiation is significant, an evaporating porous surface may gradually warm up as it dries resulting in enhancement of evaporation rates and energy partitioning. The analytical model addresses the long standing challenge of nonlinear evaporative fluxes from drying surfaces while providing predictions for surface energy partitioning over evaporating surfaces.

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Investigation of thermal inertia and hydric properties of an eco-building material: compressed stabilized earth blocks

Boulmaali

Belhamri

2022

Heat Mass Transfer

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Heat and mass transfer along a wetted porous plate in an air stream

Cited by 17 publications

References 19 publications

Analysis of convective heat and mass transfer coefficients for convective drying of a porous flat plate by conjugate modelling

Analysis of convective heat and mass transfer coefficients for convective drying of a porous flat plate by conjugate modelling

Temperature dynamics during nonisothermal evaporation from drying porous surfaces

Investigation of thermal inertia and hydric properties of an eco-building material: compressed stabilized earth blocks

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