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Finite-size Evaporating Droplets in Weakly Compressible Homogeneous Shear Turbulence by Scapin, Nicolò; Barba, Federico Dalla; Lupo, Giandomenico; Rosti, Marco Edoardo; Duwig, Christophe; Brandt, Luca is a scholarly article available to read on EtoBox.

What is Finite-size Evaporating Droplets in Weakly Compressible Homogeneous Shear Turbulence about?

We perform interface-resolved simulations of finite-size evaporating droplets in weakly-compressible homogeneous shear turbulence (HST). The study is conducted by varying three dimensionless physical parameters: the initial gas temperature over the critical temperature $T_{g,0}/T_c$, the initial droplet diameter over the Kolmogorov scale $d_0/\eta$ and the surface tension, i.e. the shear-based Weber number, $We_{\mathcal{S}}$. For the smallest $We_{\mathcal{S}}$, 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 Fr\"ossling/Ranz-Marshall correlation underpredicts the Sherwood number at low temperatures, $T_{g,0}/T_c=0.75$. Next, we show that the ratio between the actual evaporation r

Author

Scapin, Nicolò; Barba, Federico Dalla; Lupo, Giandomenico; Rosti, Marco Edoardo; Duwig, Christophe; Brandt, Luca

Published

2021

Language

EN