A mass transfer correlation for droplet evaporation in high-temperature flows

Renksizbulut, Metin; Nafziger, Rick; Li, Xianguo

doi:10.1016/0009-2509(91)85133-i

Cited by 70 publications

(33 citation statements)

References 15 publications

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“…Under the assumption of a negligible internal circulation inside the droplet, as has been experimentally investigated in a similar setup and concluded to be reasonable [28], the Sherwood number for mass transfer is given by [29] Sh = 2.0 + 0.552Re…”

Section: Mass Loss Equationmentioning

confidence: 90%

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On the behavior of micro-spheres in a hydrogen pellet target

Nordhage

Fridén

et al. 2005

Nuclear Instruments and Methods in Physics Research Section A:

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A pellet target produces micro-spheres of different materials, which are used as an internal target for nuclear and particle physics studies. We will describe the pellet hydrogen behavior by means of fluid dynamics and thermodynamics. In particular one aim is to theoretically understand the cooling effect in order to find an effective method to optimize the working conditions of a pellet target. During the droplet formation the evaporative cooling is best described by a multi-droplet diffusioncontrolled model, while in vacuum, the evaporation follows the (revised) HertzKnudsen formula. Experimental observations compared with calculations clearly indicated the presence of supercooling, the effect of which is discussed as well.

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Section: Mass Loss Equationmentioning

confidence: 90%

“…The Nusselt number Nu for convective correction can be expressed as [29] Nu = 2.0 + 0.552Re (20) where the Prandtl number Pr ≃ 0.70 [31].…”

Section: Heat Balance Equationmentioning

confidence: 99%

On the behavior of micro-spheres in a hydrogen pellet target

Nordhage

Fridén

et al. 2005

Nuclear Instruments and Methods in Physics Research Section A:

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“…with the Sherwood number Sh evaluated from the correlation of Nafziger, see reference [20]: (11) and the Reynolds number expressed as:…”

Section: Ys T K Tgmentioning

confidence: 99%

“…Equation (20) has been derived with the assumptions of (i) constant diffusivity, (ii) high Reynolds number values in such a manner that the molecular term (III) becomes vanishingly small and is subsequently neglected. Moreover, in contrast with reference [25], we consider here the mixture fraction ξ instead of the mass fraction of a reactive species (or progress variable).…”

Section: Droplet Induced Fluctuations Of Compositionmentioning

confidence: 99%

Lagrangian modelling of turbulent spray combustion under liquid rocket engine conditions

2014

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“…Blowing effects are absent in this expression, which is attributed to the fact that the observations by Ranz and Marshall (1952) were mostly below 90 o C (Renksizbulut et al 1991). At nonzero Reynolds numbers, experimental observations show a strong analogy between heat and mass transfer allowing for a corresponding Nusselt number correlation of…”

Section: Governing Equations and Numerical Methodsmentioning

confidence: 78%

Computational Models for Simulating Multicomponent Aerosol Evaporation in the Upper Respiratory Airways

Longest

Kleinstreuer

2005

Aerosol Science and Technology

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An effective model for predicting multicomponent aerosol evaporation in the upper respiratory system that is capable of estimating the vaporization of individual components is needed for accurate dosimetry and toxicology analyses. In this study, the performance of evaporation models for multicomponent droplets over a range of volatilities is evaluated based on comparisons to available experimental results for conditions similar to aerosols in the upper respiratory tract. Models considered include a semiempirical correlation approach as well as resolved-volume computational simulations of single and multicomponent aerosol evaporations to test the effects of variable gas-phase properties, surface blowing velocity, and internal droplet temperature gradients. Of the parameters assessed, concentration-dependent gasphase specific heat had the largest effect on evaporation and should be taken into consideration for respiratory aerosols that contain high volatility species, such as n-heptane, at significant concentrations. For heavier droplet components or conditions below body temperatures, semiempirical estimates were shown to be appropriate for respiratory aerosol conditions. In order to reduce the number of equations and properties required for complex mixtures, a resolved-volume evaporation model was used to identify a twelve-component surrogate representation of potentially toxic JP-8 fuel based on comparisons to experimentally reported droplet evaporation data. Due to the relatively slow evaporation rate of JP-8 aerosols, results indicate that a semiempirical evaporation Address correspondence to Dr. P. Worth Longest, Department of Mechanical Engineering, Virginia Commonwealth University, 601 West Main Street, P.O. Box 843015, Richmond, VA 23284-3015, USA. E-mail: pwlongest@vcu.edu model in conjunction with the identified surrogate mixture provide a computationally efficient method for computing droplet evaporation that can track individual toxic markers. However, semiempirical methodologies are in need of further development to effectively compute the evaporation of other higher volatility aerosols for which variable gas-phase specific heat does play a significant role.

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A mass transfer correlation for droplet evaporation in high-temperature flows

Cited by 70 publications

References 15 publications

On the behavior of micro-spheres in a hydrogen pellet target

On the behavior of micro-spheres in a hydrogen pellet target

Lagrangian modelling of turbulent spray combustion under liquid rocket engine conditions

Computational Models for Simulating Multicomponent Aerosol Evaporation in the Upper Respiratory Airways

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