Finite-size evaporating droplets in weakly compressible homogeneous shear turbulence

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Scapin, NicoloKTH,Strömningsmekanik och Teknisk Akustik (author)

Finite-size evaporating droplets in weakly compressible homogeneous shear turbulence

Article/chapterEnglish2022

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2022-01-14
Cambridge University Press (CUP),2022
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LIBRIS-ID:oai:DiVA.org:kth-307550
https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-307550URI
https://doi.org/10.1017/jfm.2021.1140DOI

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Language:English
Summary in:English

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QC 20220131
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.

Subject headings and genre

TEKNIK OCH TEKNOLOGIER Maskinteknik Strömningsmekanik och akustik hsv//swe
ENGINEERING AND TECHNOLOGY Mechanical Engineering Fluid Mechanics and Acoustics hsv//eng
drops
condensation/evaporation
homogeneous turbulence

Added entries (persons, corporate bodies, meetings, titles ...)

Dalla Barba, FedericoUniv Padua, Dept Ind Engn, I-35131 Padua, Italy.;Univ Padua, CISAS, I-35131 Padua, Italy. (author)
Lupo, GiandomenicoKTH,Teknisk mekanik(Swepub:kth)u1zivf8n (author)
Rosti, Marco EdorardoOkinawa Inst Sci & Technol Grad Univ OIST, Complex Fluids & Flows Unit, 1919-1 Tancha, Onna, Okinawa 9040495, Japan. (author)
Duwig, ChristopheKTH,Processteknologi(Swepub:kth)u1guz8kz (author)
Brandt, LucaKTH,Strömningsmekanik och Teknisk Akustik,Norwegian Univ Sci & Technol NTNU, Dept Energy & Proc Engn, NO-7491 Trondheim, Norway.(Swepub:kth)u15iawoo (author)
KTHStrömningsmekanik och Teknisk Akustik (creator_code:org_t)

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In:Journal of Fluid Mechanics: Cambridge University Press (CUP)9340022-11201469-7645

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By the author/editor: Scapin, Nicolo; Dalla Barba, Fed ...; Lupo, Giandomeni ...; Rosti, Marco Edo ...; Duwig, Christoph ...; Brandt, Luca

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