Wicking and evaporation of liquids in porous wicks: A simple analytical approach to optimization of wick design

Beyhaghi, Saman; Geoffroy, Sandrine; Prat, Marc; Pillai, Krishna M.

doi:10.1002/aic.14353

Cited by 38 publications

(27 citation statements)

References 24 publications

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“…(1) to porous media drying is discussed in Ref. 19 where it is shown that the exact distribution of the flux depends on geometrical details, such as the thickness of the cylindrical vessel containing the beads or related to the shape of the enclosure. Also, as discussed in Ref.…”

Section: Experimental Results and First Hintsmentioning

confidence: 99%

Porous medium coffee ring effect and other factors affecting the first crystallisation time of sodium chloride at the surface of a drying porous medium

et al. 2013

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We study the distribution of ions in a drying porous medium up to the formation of first crystals at the surface. The study is based on comparisons between numerical simulations and experiments with packings of glass beads. The experimental configuration, which is representative of many previous drying experiments, is characterized by the formation of an efflorescence fairy ring at the surface of the porous medium. The preferential formation of crystals at the periphery is explained by the combined effect of higher evaporation fluxes at the surface periphery, as in the classical coffee ring problem, and variations in the porosity near the wall bordering the packing. It is shown that both effects have a great impact on the time marking the occurrence of first crystals, which is referred to as the first crystallization time.The experiments indicate that the first crystallization time increases with a decreasing bead size for a given initial ion concentration. This is explained by the variation with bead size of the characteristic size of the near wall region where a preferential desaturation of the sample occurs as a result of the porosity increase near the wall. The study also reveals a significant salt supersaturation effect. This represents a noticeable fact in relation with salt weathering issues. C 2013 AIP Publishing LLC.

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Section: Experimental Results and First Hintsmentioning

confidence: 99%

Porous medium coffee ring effect and other factors affecting the first crystallisation time of sodium chloride at the surface of a drying porous medium

et al. 2013

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“…It was previously observed that wicking and evaporation occur simultaneously when a fabric is partly immersed in water [19] as illustrated in Figure 1. Water transfer begins spontaneously, driven by capillary force, and evaporation takes place at the same time when the fabric is in contact with water [20]. Previous studies concerned with wicking-evaporating have been carried out on nontextile materials [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Effect of Weaving Structures on the Water Wicking–Evaporating Behavior of Woven Fabrics

Lei

Liu

et al. 2020

Polymers

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Water transfer through porous textiles consists of two sequential processes: synchronous wicking–evaporating and evaporating alone. In this work we set out to identify the main structural parameters affecting the water transfer process of cotton fabrics. Eight woven fabrics with different floats were produced. The fabrics were evaluated on a specially designed instrument capable of measuring the water loss through a vertical wicking process. Each test took 120 min, and two phases were defined: Phase I for the first 10 min and Phase II for the last 110 min according to wicking behavior transition. Principal components and multivariate statistical methods were utilized to analyze the data collected. The results showed that Phase I dominated the whole wicking–evaporating process, and the moisture transfer speed in this phase varied with fabric structure, whereas the moisture transfer speeds in Phase II were similar and constant regardless of fabric structure. In addition, fabric with more floats has high water transfer speed in Phase I due to its loosened structure with more macropores.

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“…Beyhaghi et al examined the effects of variation in geometrical parameters of a wick, such as porosity, height, and bead size on the wicking and evaporation processes. The optimal bead‐radius was found to be half of the equilibrium bead‐radius, which is the maximum radius that lets the liquid front reach the wick top.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of effective parameters on the drying process in a vertical porous channel

Gholami

Kouhikamali

Sharifi

2019

Heat Trans. Asian Res.

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Comprehensive understanding of evaporation in porous channels is important for the design of modern heat exchangers and thermal systems such as heat pipes. This paper presents a numerical study of evaporation in a vertical porous channel. The volume of the fluid method was applied to capture the interface between phases. The multi-dimensional limiter for explicit solution method, in which there are additional constraints based on the flux-corrected transfer method, was used to solve the interface transfer equation. Pressure drop, Nusselt number, and the drying rate were considered as performance parameters. Comparing simulation results with experimental data showed that this new solver can precisely solve the thermal phase change in a porous medium. The influence of parameters effective on the drying process, such as porosity, permeability, the dynamic contact angle was investigated. Based on the results of the pressure profile in the final state, four different regions are visible. Because of the close fit of the wall temperature to the average cross-sectional temperature, the Nusselt number increases sharply at transition points from the liquid to the vapor phase.By increasing the dynamic contact angle, the average drying rate in the channel is reduced. K E Y W O R D S effective parameters, evaporation, porous medium, vertical channel, VOF method

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Wicking and evaporation of liquids in porous wicks: A simple analytical approach to optimization of wick design

Cited by 38 publications

References 24 publications

Porous medium coffee ring effect and other factors affecting the first crystallisation time of sodium chloride at the surface of a drying porous medium

Porous medium coffee ring effect and other factors affecting the first crystallisation time of sodium chloride at the surface of a drying porous medium

Effect of Weaving Structures on the Water Wicking–Evaporating Behavior of Woven Fabrics

Numerical study of effective parameters on the drying process in a vertical porous channel

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