Experimental investigation of the evaporation of suspended mono-sized heptane droplets in turbulence intensities approaching unity

Verwey, Cameron; Birouk, Madjid

doi:10.1016/j.combustflame.2020.06.007

Cited by 5 publications

(2 citation statements)

References 41 publications

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“…In the current study we therefore consider finite-size evaporating droplets in SS-HST, assuming an incompressible liquid surrounded by a compressible gas phase at higher temperature. The initial size, ranging between 10.5η and 21.5η, is chosen to focus on evaporation enhancement by turbulence (Verwey & Birouk 2020) and to elucidate the effects of the interface deformation. This last aspect is less discussed in literature and, so far, the spherical assumption has been invoked to describe the droplet shape also in fully resolved simulations (Lupo et al 2019.…”

Section: Introductionmentioning

confidence: 99%

Finite-size evaporating droplets in weakly compressible homogeneous shear turbulence

et al. 2022

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We perform interface-resolved simulations of finite-size evaporating droplets in weakly compressible homogeneous shear turbulence. 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 Frössling/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 rate in turbulence and the one computed in stagnant conditions is always much higher than one for weakly deformable droplets: it decreases with $T_{g,0}/T_c$ without approaching unity at the highest $T_{g,0}/T_c$ 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 $We_{\mathcal {S}}$, showing a positive correlation between evaporation rate and interfacial curvature, especially at the lowest $T_{g,0}/T_c$.

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Section: Introductionmentioning

confidence: 99%

Finite-size evaporating droplets in weakly compressible homogeneous shear turbulence

et al. 2022

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“…As discussed above, the classical D 2 -Law is established for large 3D systems, while a finite size and/or 2D system is encountered in many situations, which has not yet been systematically investigated. In experiments, examples of finite-size systems are the evaporation of a single droplet in microfluidic systems [13,31] or a dense collection of millimetric/micrometric droplets in a macroscale combustion chamber [32]. From the numerical simulation point of view, the system size is always limited by the computational cost [14], and 2D simulations are often considered for preliminary studies or model validation [29].…”

Section: Introductionmentioning

confidence: 99%

Droplet evaporation in finite-size systems: Theoretical analysis and mesoscopic modeling

et al. 2022

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Liquid jet breakup in a subsonic cross airflow: An experimental study of the effect of the gas phase turbulence

Peters,

Birouk

2023

Exp. Comput. Multiph. Flow

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Experimental investigation of the evaporation of suspended mono-sized heptane droplets in turbulence intensities approaching unity

Cited by 5 publications

References 41 publications

Finite-size evaporating droplets in weakly compressible homogeneous shear turbulence

Finite-size evaporating droplets in weakly compressible homogeneous shear turbulence

Droplet evaporation in finite-size systems: Theoretical analysis and mesoscopic modeling

Liquid jet breakup in a subsonic cross airflow: An experimental study of the effect of the gas phase turbulence

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