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Finite-size evaporating droplets in weakly compressible homogeneous shear turbulence
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- Scapin, Nicolo (författare)
- KTH,Strömningsmekanik och Teknisk Akustik
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- Dalla Barba, Federico (författare)
- Univ Padua, Dept Ind Engn, I-35131 Padua, Italy.;Univ Padua, CISAS, I-35131 Padua, Italy.
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- Lupo, Giandomenico (författare)
- KTH,Teknisk mekanik
- visa fler...
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- (creator_code:org_t)
- 2022-01-14
- 2022
- Engelska.
- Ingår i: Journal of Fluid Mechanics. - : Cambridge University Press (CUP). - 0022-1120 .- 1469-7645. ; 934
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
Stäng
- We perform interface-resolved simulations of finite-size evaporating droplets in wealdy compressible homogeneous shear turbulence. The study is conducted by varying three dimensionless physical parameters: the initial gas temperature over the critical temperature T-g,T-0/T-c, the initial droplet diameter over the Kolmogorov scale d(0)/eta and the surface tension, i.e. the shear-based Weber number, We(S). For the smallest We(S), we first discuss the impact on the evaporation rate of the three thermodynamic models employed to evaluate the gas thermophysical properties: a constant property model and two variable-properties approaches where either the gas density or all the gas properties are allowed to vary. Taking this last approach as reference, the model assuming constant gas properties and evaluated with the '1/3' rule is shown to predict the evaporation rate better than the model where the only variable property is the gas density. Moreover, we observe that the well-known Frossling/Ranz-Marshall correlation underpredicts the Sherwood number at low temperatures, T-g,T-0/T-c = 0.75. Next, we show that the ratio between the actual evaporation rate in turbulence and the one computed in stagnant conditions is always much higher than one for wealdy deformable droplets: it decreases with T-g,T-0/T-c without approaching unity at the highest T-g,T-0/T-c considered. This suggests an evaporation enhancement due to turbulence also in conditions typical of combustion applications. Finally, we examine the overall evaporation rate and the local interfacial mass flux at higher Wes, showing a positive correlation between evaporation rate and interfacial curvature, especially at the lowest T-g,T-0/T-c.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
Nyckelord
- drops
- condensation/evaporation
- homogeneous turbulence
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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- Scapin, Nicolo
- Dalla Barba, Fed ...
- Lupo, Giandomeni ...
- Rosti, Marco Edo ...
- Duwig, Christoph ...
- Brandt, Luca
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