Evaporation characteristics of dual component droplet of benzyl azides-hexadecane mixtures at elevated temperatures

Han, Kai; Zhao, Changlu; Fu, Geng; Zhang, Fujun; Pang, Siping; Li, Yuchuan

doi:10.1016/j.fuel.2015.05.004

Cited by 39 publications

(21 citation statements)

References 17 publications

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“…n-Hexadecane droplets evaporation from Han et al [55] have been modeled ( Figure 15). Experimental data on the mean droplet temperature are also available.…”

Section: Numerical Simulations: Results and Discussionmentioning

confidence: 99%

“…We expect the experimental cases of our interest to behave somewhere in-between these two cases, closer to the upper limit described by the black lines in Figure 9 In order to verify this hypothesis, a simple analysis has been conducted on the droplet shapes usually involved in experiments. 10 pictures of suspended droplets available in literature from experimental works [52,53,54,55,56,57,58] have been collected (Figure 10 b) and organized based on two dimensionless numbers, the sphericity ψ and the Eötvös number Eo, defined as:…”

Section: Effect Of the Droplet Shape On Evaporationmentioning

confidence: 99%

“…For all cases, the experimental data provided concern the droplet "equivalent" diameter decay. Han et al [55] also provided some data on the mean droplet temperature by using a thermocouple as a fiber. To our knowledge, the cases from Verwey et al [61] and Han et al [55] have never been modeled.…”

Section: Description Of the Experimental Casesmentioning

confidence: 99%

See 2 more Smart Citations

DropletSMOKE++: A comprehensive multiphase CFD framework for the evaporation of multidimensional fuel droplets

Saufi¹,

Frassoldati²,

Faravelli³

et al. 2019

International Journal of Heat and Mass Transfer

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This paper aims at presenting the DropletSMOKE++ solver, a comprehensive multidimensional computational framework for the evaporation of fuel droplets, under the influence of a gravity field and an external fluid flow. The Volume Of Fluid (VOF) methodology is adopted to dynamically track the interface, coupled with the solution of energy and species equations. The evaporation rate is directly evaluated based on the vapor concentration gradient at the phase boundary, with no need of semi-empirical evaporation sub-models.The strong surface tension forces often prevent to model small droplets evaporation, because of the presence of parasitic currents. In this work we by-pass the problem, eliminating surface tension and introducing a centripetal force toward the center of the droplet. This expedient represents a major novelty of this work, which allows to numerically hang a droplet on a fiber in normal gravity conditions without modeling surface tension. Parasitic currents are completely suppressed, allowing to accurately model the evaporation process whatever the droplet size. DropletSMOKE++ shows an excellent agreement with the experimental data in a wide range of operating conditions, for various fuels and initial droplet diameters, both in natural and forced convection. The comparison with the same cases modeled in microgravity conditions highlights the impact of an external fluid flow on the evaporation mechanism, especially at high pressures.Non-ideal thermodynamics for phase-equilibrium is included to correctly capture evaporation rates at high pressures, otherwise not well predicted by an ideal gas assumption. Finally, the presence of flow circulation in the liquid phase is discussed, as well as its influence on the internal temperature field. DropletSMOKE++ will be released as an open-source code, open to contributions from the sci-

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“…n-Hexadecane droplets evaporation from Han et al [55] have been modeled ( Figure 15). Experimental data on the mean droplet temperature are also available.…”

Section: Numerical Simulations: Results and Discussionmentioning

confidence: 99%

Section: Effect Of the Droplet Shape On Evaporationmentioning

confidence: 99%

See 1 more Smart Citation

DropletSMOKE++: A comprehensive multiphase CFD framework for the evaporation of multidimensional fuel droplets

Saufi¹,

Frassoldati²,

Faravelli³

et al. 2019

International Journal of Heat and Mass Transfer

View full text Add to dashboard Cite

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“…n-Butanol can not be used as a neat fuel in a diesel engine because of its lower heating value (3.31×10 7 J/kg), lower kinematic viscosity (2.22×10 -6 m 2 /s), lower cetane number (25) and higher auto-ignition temperature (658 K) than diesel (heating value: 4.25×10 7 J/kg, kinematic viscosity: 2.70×10 -6 m 2 /s, cetane number: 40-55, auto-ignition temperature: 501 K). Table 1 Physical properties of n-butanol, n-hexadecane and diesel [3,13,22,28,29] Physical properties n-Butanol n-Hexadecane Diesel The addition of high n-butanol content into diesel can improve engine performance and emission characteristics [2,7,11,12].…”

Section: Introductionmentioning

confidence: 99%

“…From Table 1, the physical properties of n-hexadecane are similar with those of diesel. Therefore, n-hexadecane is used as a representative for diesel to eliminate the influence of diesel's multicomponents [13]. In this work, BUT50 (the blend of 50% n-butanol and 50% n-hexadecane) is chosen as the test fuel.…”

Section: Introductionmentioning

confidence: 99%

Effect of ambient temperature on the puffing characteristics of single butanol-hexadecane droplet

Zhang

Huang

et al. 2018

Energy

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Puffing characteristics of BUT50 (50% n-butanol and 50% n-hexadecane by mass) were investigated using the droplet suspension technology under 638, 688 and 738 K. Experimental results showed that BUT50 underwent transient heating, fluctuation evaporation and equilibrium evaporation phases under all ambient temperatures. In the fluctuation evaporation phase, the fluctuation frequency of 738 K was higher than those of 638 and 688 K and the (D max /D 0) 2 of 738 K was lower than those of 638 and 688 K. Easy bubble rupture led to high fluctuation frequency and low (D max /D 0) 2 at 738 K. Three turning points could be found in the curve of transient temperature growth rate at 638 and 738 K. Four characteristic droplet temperatures were analyzed, including droplet temperatures at the start (T 1) and end (T 2) of transient heating phase, at (D max /D 0) 2 (T 3) and at the end of total lifetime (T 4). T 2 was slightly lower and T 3 was slightly higher than the boiling point of n-butanol. T 4 was lower than the boiling point of n-hexadecane. Furthermore, the transient heating duration (t TH), fluctuation evaporation duration (t FE) and total lifetime (t TL) decreased with increasing ambient temperature. The reduction of t FE played an important role in the decrease of t TL. The percentages of t TH /t TL and t FE /t TL were stable with increasing ambient temperature.

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A new shift mechanism for micro-explosion of water-diesel emulsion droplets at different ambient temperatures

Wang

Yuan²,

Cao³

et al. 2022

Applied Energy

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Evaporation characteristics of dual component droplet of benzyl azides-hexadecane mixtures at elevated temperatures

Cited by 39 publications

References 17 publications

DropletSMOKE++: A comprehensive multiphase CFD framework for the evaporation of multidimensional fuel droplets

DropletSMOKE++: A comprehensive multiphase CFD framework for the evaporation of multidimensional fuel droplets

Effect of ambient temperature on the puffing characteristics of single butanol-hexadecane droplet

A new shift mechanism for micro-explosion of water-diesel emulsion droplets at different ambient temperatures

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