Numerical Modeling of Evaporation and Combustion of Isolated Liquid Fuel Droplets: a Review

Raghavan, Vasudevan

doi:10.1007/s41745-019-0097-5

Cited by 13 publications

(5 citation statements)

References 110 publications

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“…10b) with the ambient temperature and/or the ambient pressure is basically consistent with that of the droplet evaporation lifetime tL (Fig. 10a), which is also consistent with the previous experimental results [42,63]. The evaporation rate constant k increases with increasing ambient temperature.…”

Section: The Macroscopic Evaporation Characteristics Of Multi-component Dropletssupporting

confidence: 91%

“…The effect of decreasing latent heat of vaporization exceeded the combined effects of decreasing mass diffusivity and increasing boiling point of the fuel, leading to the decrease of droplet evaporation lifetime [26]. The temperatures studied in this paper are very high (T ＞Tc), so the present conclusion is consistent with existing ones [63,[95][96][97][98]. However, when the ambient pressure is higher (P ＞ 6 MPa), the effect of the decreasing latent heat of evaporation with increasing ambient pressure is offset by the combined effect of the decreasing mass diffusivity, decreasing thermal conductivity, and increasing boiling point of the fuel [26].…”

Section: The Macroscopic Evaporation Characteristics Of Multi-component Dropletssupporting

confidence: 88%

“…The evaporation process of multi-component droplets is much more complex when supercritical transition is involved [61]. Establishing the MD approach for multi-component fuel evaporation to study the VLE and supercritical transition process has important theoretical and practical significances [62,63].…”

Section: Introductionmentioning

confidence: 99%

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Phase transitions of multi-component fuel droplets under sub- and supercritical conditions

Gong

Xiao

et al. 2021

Fuel

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Section: The Macroscopic Evaporation Characteristics Of Multi-component Dropletssupporting

confidence: 91%

Section: The Macroscopic Evaporation Characteristics Of Multi-component Dropletssupporting

confidence: 88%

See 1 more Smart Citation

Phase transitions of multi-component fuel droplets under sub- and supercritical conditions

Gong

Xiao

et al. 2021

Fuel

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“…In order to have a more accurate view of the vaporization phenomenon, the finite conductivity model was considered, which does not consider the study of phenomena occurring inside the droplet, but rather the thermal diffusion in the gas [ 17 ]. Convection in the droplet is neglected and concentration and temperature gradients are taken into account [ 18 , 19 ]. The temperature evolution is represented using the energy conservation equation below:

where: T —temperature, t —time, λ i —heat conduction coefficient, ρ —density, C p —specific heat at constant pressure, r —radius.…”

Section: Determination Of the Temperature Distribution Of The Ultraso...mentioning

confidence: 99%

Experimental Investigations upon Ultrasound Influence on Calefaction of AdBlue in Selective Catalytic Reduction Systems (SCR)

2023

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The present paper intends to provide an analysis of how the process of calefaction occurs in a selective catalytic reduction (SCR) system and the mechanisms by which the deposition of AdBlue crystals on a hot surface evolve. Experimentally, two aluminium samples heated to 200 °C were used, over which AdBlue droplets with different atomisation rates were dropped, maintaining the same dynamic flow parameters, in order to observe the influence of temperature effects on the degree of deposition of crystallised sediment on the surface. The authors proposed the use of calefaction in an ultrasonic environment to prevent deposition and to increase droplet fragmentation by a break-up process. To prove the performance of this method one sample was subjected to a normal flow regime while a second sample was exposed to ultrasound. Both samples were assembled on a magneto-strictive concentrator operating at a frequency of 20 kHz. The obtained results indicated that the sample exposed to ultrasound demonstrated lower urea crystallisation compared to the sample that was not exposed to this treatment. Thus, it can be seen that the proposed method of injecting AdBlue into an ultrasonic zone gives the desired results.

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“…There have been numerous investigations, spanning decades, that focus on the behaviour of vaporizing (and burning) droplets. Some recent reviews are available in Raghavan (2019), Zang et al (2019), Sazhin (2017), Karbalaei, Kumar & Cho (2016), Erbil (2012) and Sazhin (2006). A monograph by Sirignano (2010) is also available.…”

Section: Introductionmentioning

confidence: 99%

Influence of the gas-phase Lewis number and thermocapillary stress on motion of a slowly evaporating droplet in Stokes flow

Shaw

2022

J. Fluid Mech.

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The influence of thermocapillary stresses on motion of a slowly evaporating single-component droplet in Stokes flow is investigated analytically for the situation where the environment does not have a temperature gradient in the far field. The conservation equations are solved in the liquid and gas phases and coupled at the gas–liquid interface by applying conditions for conservation of mass, species, momentum and energy. It is found that thermocapillary stresses may influence droplet motion by changing the the interface velocity, and that the gas-phase Lewis number of the evaporating component determines whether Marangoni effects increase or decrease droplet drag. If the Lewis number is less than unity, then thermal Marangoni effects increase droplet drag, while if the Lewis number is greater than unity, then thermal Marangoni effects decrease droplet drag. This is related to the sign of the temperature gradient along the droplet surface that is induced by convection. It is found that conditions may exist where a vaporizing droplet in a microgravity environment will exhibit continuous translational motion driven by thermocapillary effects.

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Numerical Modeling of Evaporation and Combustion of Isolated Liquid Fuel Droplets: a Review

Cited by 13 publications

References 110 publications

Phase transitions of multi-component fuel droplets under sub- and supercritical conditions

Phase transitions of multi-component fuel droplets under sub- and supercritical conditions

Experimental Investigations upon Ultrasound Influence on Calefaction of AdBlue in Selective Catalytic Reduction Systems (SCR)

Influence of the gas-phase Lewis number and thermocapillary stress on motion of a slowly evaporating droplet in Stokes flow

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