Fuel vaporization: Effect of droplet size and turbulence at elevated temperature and pressure

Verwey, Cameron; Birouk, Madjid

doi:10.1016/j.combustflame.2017.10.010

Cited by 32 publications

(5 citation statements)

References 45 publications

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“…In all cases, droplets with larger d 0 /η (i.e. higher Re S ) evaporate faster, in agreement with previous experimental studies in HIT (Verwey & Birouk 2018, 2020 and in the presence of a mean flow (Marti et al 2017). This is explained by the enhanced surface vapour gradient and faster dispersion of the vapour around the droplet for larger d 0 /η, related to the fact that larger flow structures are more energetic.…”

Section: Effects Of the Shear-based Reynolds Numbersupporting

confidence: 89%

“…Figure 19 numerical results. A good agreement is observed with a deviation of evaporation rate K DNS of less then 7 % with respect to the experimental data, which is considered a satisfactory result and within the uncertainty of the measurement (Verwey & Birouk 2018). εn+1 does not contain any spatial-dependent term, i.e.…”

Section: C3 Single Droplet Evaporating In Hitsupporting

confidence: 81%

“…As a final validation case, we reproduce the experimental results in Verwey & Birouk (2018), reproduced also in Dodd et al (2021), consisting of a single n-heptane droplet of initial diameter d 0 = 200 μm, which evaporates in nitrogen at T g = 348 K and p th,0 = 10 bar. For this test case, we consider HIT sustained by an artificial forcing (Podvigina & Pouquet 1994) at a Reynolds number based on the Taylor's microscale Re λ = u rms λ/ν g,r ≈ 32.…”

Section: C3 Single Droplet Evaporating In Hitmentioning

confidence: 99%

“…Historically, evaporating droplets in turbulence have been the subject of numerous and extensive experimental campaigns which have mainly focused on the flow topology inside the droplets (Wong & Lin 1992;Mandal & Bakshi 2012), on the interaction between droplet dispersion and vapour clouds structure (De Rivas & Villermaux 2016;Villermaux et al 2017;Sahu, Hardalupas & Taylor 2018) and on evaporation enhancement of super-Kolmogorov (i.e. finite-size) droplets (Marti et al 2017;Verwey & Birouk 2018, 2020. On the computational side, the most common approach has been the point particle method (Kuerten 2016;Maxey 2017) for the studies of sub-Kolmogorov droplets in different flow configurations, i.e.…”

Section: Introductionmentioning

confidence: 99%

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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: Effects Of the Shear-based Reynolds Numbersupporting

confidence: 89%

Section: C3 Single Droplet Evaporating In Hitsupporting

confidence: 81%

Section: C3 Single Droplet Evaporating In Hitmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Finite-size evaporating droplets in weakly compressible homogeneous shear turbulence

et al. 2022

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“…Due to decreased convection, poor diffusivity results in the relative stagnation of vapour layers around the droplet in a high- pressure environment. This stagnation with elevated pressures is also observed in droplets of n-heptane [19], ndecane [46], and kerosene [47] at high pressures. As such, the relative importance of convection, either free or forced, significantly influences evaporation enhancement at higher pressures [19].…”

Section: Pressure Effects At Various Ambient Temperaturesmentioning

confidence: 59%

Numerical Simulation of Palm Biodiesel Droplet Evaporation at Various Temperatures and Pressures

Amsal

Tran

Hung

et al. 2023

International Journal of Energy Research

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This study uses numerical simulations to determine the evaporation characteristics of palm biodiesel droplets under normal gravity at temperatures ranging from 473 to 873 K and pressures ranging from 0.2 to 5 bar. A transient, two-phase, axisymmetric volume of fluid (VOF) model is employed to model transport processes across phases. The palm methyl ester is modelled as a single-component fuel with temperature- and pressure-dependent thermophysical properties. The study compares the obtained evaporation rates with those available in the literature and presents the effects of external parameters in experimental setups. Additionally, the study investigates the effects of changing the oxygen/nitrogen composition of the environment at elevated temperatures. The results show that elevated temperatures enhance the evaporation rate at all pressures and oxygen contents due to significantly enhanced thermal conductivity and droplet surface temperatures, while elevated pressures decrease the evaporation rates. Across the pressure range, evaporation rates decrease by 219%, 213%, and 196% for temperatures of 473, 673, and 873 K, respectively. Furthermore, increasing oxygen concentration in the environment can also increase the evaporation rate; however, the effect is less noticeable with a 6.4% increase at 473 K and more significant with a 27.8% increase at 873 K across the selected oxygen composition range.

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Heating and Evaporation of Mono-component Droplets

Sazhin

2022

Droplets and Sprays: Simple Models of Complex Processes

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Fuel vaporization: Effect of droplet size and turbulence at elevated temperature and pressure

Cited by 32 publications

References 45 publications

Finite-size evaporating droplets in weakly compressible homogeneous shear turbulence

Finite-size evaporating droplets in weakly compressible homogeneous shear turbulence

Numerical Simulation of Palm Biodiesel Droplet Evaporation at Various Temperatures and Pressures

Heating and Evaporation of Mono-component Droplets

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