Evaporation rates of pure hydrocarbon liquids under the influences of natural convection and diffusion

Kelly-Zion, Peter; Pursell, Christopher J.; Booth, Ryan S.; VanTilburg, Alec N.

doi:10.1016/j.ijheatmasstransfer.2009.01.015

Cited by 35 publications

(24 citation statements)

References 30 publications

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“…As indicated by a previous study it is likely the vapor, which is heavier than air, flows off the surface of the drop thereby increasing the transport rate [16]. This explanation is plausible considering a comparison of representative velocity scales.…”

Section: Experimental Results and The Diffusion-controlled Modelmentioning

confidence: 58%

“…This explanation is plausible considering a comparison of representative velocity scales. The representative diffusion velocity, v D , is equal to D/l, where the characteristic length, l, is taken to be the thickness of the vapor cloud which resides above the drop as reported in [16]. This thickness is approximately 5 mm for an evaporating hexane drop.…”

Section: Experimental Results and The Diffusion-controlled Modelmentioning

confidence: 99%

“…Measured rates were from 50% to 475% greater than the values computed by the diffusion-controlled evaporation model. Based on evidence provided by [16], the higher rates are attributed to an increase in the transport of the vapor from the drop surface by natural convection.…”

Section: Discussionmentioning

confidence: 99%

“…(ρ m -ρ a ) varies by a factor of three for the components in this study. The drops were created in a manner similar to what is reported in reference [16]. To create drops of a specified size, a pipettor or syringe was used to deposit a controlled amount of liquid on a flat circular platform that is raised slightly above the base horizontal surface, as shown in profile in Fig.…”

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Evaporation of sessile drops under combined diffusion and natural convection

Kelly-Zion

Pursell

Vaidya

et al. 2011

Colloids and Surfaces A: Physicochemical and Engineering Aspect

123

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Experiments were conducted to investigate the range of applicability of a commonly used assumption for evaporation models of sessile drops, that the transport mechanism that controls the evaporation is vapor diffusion. The evaporation rates of sessile drops of 3-methylpentane, hexane, cyclohexane, and heptane were measured. The radius of the drop contact line was constant during the measurements and drops of radius from 1 mm to 22 mm were studied. It was found that a diffusion-controlled evaporation model underpredicts the evaporation rate from 36% to 80% depending on the drop size. The increase in the evaporation rate was attributed to a second transport mechanism, natural convection of the vapors, and an empirical model was developed for conditions of combined diffusive and convective transport. Over the broad range of volatilities and drop sizes studied, the evaporation rates computed using the combined transport model agree with the measured values with less than 6% root mean square error.

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Section: Experimental Results and The Diffusion-controlled Modelmentioning

confidence: 58%

Section: Experimental Results and The Diffusion-controlled Modelmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Evaporation of sessile drops under combined diffusion and natural convection

Kelly-Zion

Pursell

Vaidya

et al. 2011

Colloids and Surfaces A: Physicochemical and Engineering Aspect

123

View full text Add to dashboard Cite

show abstract

“…Strong evidence of natural convection occurring during the evaporation of these hydrocarbon species is provided by schlieren videos, which indicate that a pancake-shaped vapor cloud forms above the evaporating drop and this cloud flows radially away from the drop by natural convection [16]. The flow of vapor is assumed to be similar to the thermally induced natural convection along the top surface of a chilled disk.…”

Section: Introductionmentioning

confidence: 99%

Correlation for the convective and diffusive evaporation of a sessile drop

Kelly-Zion

Batra

Pursell

2013

International Journal of Heat and Mass Transfer

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A simple correlation is developed to compute the evaporation rates of sessile drops and small puddles which are evaporating under the influences of both diffusion and natural convection of the vapor-air mixture surrounding the drop. The correlation is based on experiments conducted with eight hydrocarbons, which provide a factor of 16.6 variation in volatility as indicated by the equilibrium vapor pressures, a factor of 3.6 variation in molecular mass, and a factor of 2.2 variation in mass diffusivity, and thus the correlation is applicable for liquids having a broad range of properties. The correlation predicts the evaporation rates to within a root-mean-square (RMS) error of 6.5% over the broad range of conditions. Limitations of the correlation are investigated, and when one of the species is excluded, the RMS error is reduced to 4.9%.There are two main differences between this new correlation and the correlations that have been published previously. The first difference is the new correlation reduces to an expression for diffusion-limited evaporation as the density difference between the vapor-air mixture at the surface of the drop and the ambient air becomes negligible, or when the drop size becomes very small. The second difference is the form of the dependency on the density difference ratio, which in previous correlations is obtained solely through the Rayleigh number (Ra). This new correlation contains a term which represents the influence of natural convection on the evaporation rate and this term provides insight into the nature of the coupling of the diffusive and convective transport of the vapor.

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Digital holographic study of corona wind-assisted evaporation of hydrocarbon from a microliter well

Shukla

Mishra²,

Panigrahi³

2022

Appl. Phys. B

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The present study aims to understand the evaporation dynamics of heavy hydrocarbon liquid (cyclohexane) from a circular well cavity under the in uence of corona wind. Particle image velocimetry is used to characterize the velocity eld of the corona wind generated by a needle and plate con guration. Digital holography interferometry is used to decipher the mole fraction distribution of the vapor cloud.Circular well cavities of radius 2.0, 2.5 and 4 mm are studied. The study explores the effect of corona wind on the modi cation of vapor phase transport and the evaporation rate from the circular well. The effect of corona wind on the evaporation of different sized well cavities increases with an increase in actuation voltage. The side wall of the cavities in uences the distribution of the vapor cloud due to the interaction with the incoming corona wind. More than 10 times enhancement of evaporation is observed at 10 kV excitation voltage setting of the corona wind generator. The corona jet assisted evaporation can be very useful in thin lm evaporative cooling for electronics due to its simplicity in design and superior performance.

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Evaporation rates of pure hydrocarbon liquids under the influences of natural convection and diffusion

Cited by 35 publications

References 30 publications

Evaporation of sessile drops under combined diffusion and natural convection

Evaporation of sessile drops under combined diffusion and natural convection

Correlation for the convective and diffusive evaporation of a sessile drop

Digital holographic study of corona wind-assisted evaporation of hydrocarbon from a microliter well

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