Towards a predictive evaporation model for multi-component hydrocarbon droplets at all pressure conditions

Ebrahimian, Vahid; Habchi, C.

doi:10.1016/j.ijheatmasstransfer.2011.03.031

Cited by 73 publications

(49 citation statements)

References 33 publications

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“…It has been shown by the authors [10] that the one-third rule (A r =1/3) gives better results than the arithmetic mean rule (A r =1/2).…”

Section: Mass Flow Ratementioning

confidence: 98%

“…These models give the instantaneous droplet vaporization rate from the integration of the quasi-steady species balance around the droplet. The mass evaporation rate for single-component water droplet is presented as [10]:…”

Section: Mass Flow Ratementioning

confidence: 99%

“…In the following section, an UWS evaporation model based on the multi-component droplets evaporation model developed by the authors [10] is suggested. Next, a thermal decomposition model is presented.…”

Section: Introductionmentioning

confidence: 99%

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Detailed modeling of the evaporation and thermal decomposition of urea‐water solution in SCR systems

2011

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This work aims to develop a multi-component evaporation model for droplets of urea-watersolution (UWS) and a thermal decomposition model of urea for automotive exhausts using the Selective Catalytic Reduction (SCR) systems. In the multi-component evaporation model, the influence of urea on the UWS evaporation is taken into account using a NRTL activity model. The thermal decomposition model is based on a semi-detailed kinetic scheme accounting not only for the production of ammonia (NH 3 ) and isocyanic acid (HNCO), but also for the formation of heavier solid by-products (biuret, cyanuric acid and ammelide). This kinetics model has been validated against gaseous data as well as solid-phase concentration profiles obtained by Lundstroem et al. (2009) andSchaber et al. (2004). Both models have been implemented in IFP-C3D industrial software in order to simulate UWS droplet evaporation and decomposition as well as the formation of solid by-products. It has been shown that the presence of the urea solute has a small influence on the water evaporation rate, but its effect on the UWS temperature is significant. In addition, the contributions of hydrolysis and thermolysis to urea decomposition have been assessed. Finally, the impacts of the heating rate as well as gas-phase chemistry on urea decomposition pathways have been studied in detail. It has been shown that reducing the heating rate of the UWS causes the extent of the polymerization to decrease because of the higher activation energy.

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“…It has been shown by the authors [10] that the one-third rule (A r =1/3) gives better results than the arithmetic mean rule (A r =1/2).…”

Section: Mass Flow Ratementioning

confidence: 98%

Section: Mass Flow Ratementioning

confidence: 99%

See 1 more Smart Citation

Detailed modeling of the evaporation and thermal decomposition of urea‐water solution in SCR systems

2011

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“…However, they investigate the primary breakup process in which the spray turbulence is dominant, and we investigate the subsequent secondary breakup and mixture formation process in which gas-liquid interactions dominate the process. In the model of Ebrahimian and Habchi, 20 the liquid-phase temperature is assumed to be uniform for liquid-phase balance equation, without considering the temperature inhomogeneity inside the droplet during the evaporation process. In addition, the mass and heat transfer coefficients have not been corrected for high heat and mass transfer.…”

Section: Energy Conservation Inside the Dropletmentioning

confidence: 99%

Evaporation and dynamic characteristics of a high-speed droplet under transcritical conditions

Yang

Gao

Deng

et al. 2016

Advances in Mechanical Engineering

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An evaporation and aerodynamic interaction model is developed for an isolated droplet introduced into transcritical and strong convective environments. The new numerical model takes into account variable thermophysical properties, gas solubility in the liquid phase, and vapor-liquid interfacial thermodynamics. The proposed model is verified by high-speed photography experiments carried out under different operating conditions. The influences of ambient conditions on the transcritical evaporation and aerodynamic interaction are investigated with the new model. The results indicate that (1) with increasing the liquid-gas relative velocity, the spatial temperature distribution becomes more nonuniform initially and then more uniform; (2) the drop drag increases rapidly with ambient pressure in the initial period and then significantly decreases; and (3) when the ambient temperature is lower than 1.5 times the fuel critical temperature, the droplet drag force decreased with the ambient temperature; otherwise, the drag force increased initially and then decreased with the ambient temperature.

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“…Several models have been developed to predict vaporization in multicomponent droplets [1][2][3][4][5][6][7][8]. In these models, various aspects inherent to the dynamics of the vaporization process are considered, such as thermal conduction and species diffusion inside the droplet and coupling between the droplet and the adjacent phase.…”

Section: Introductionmentioning

confidence: 99%

Cross diffusion effects in the interfacial mass and heat transfer of multicomponent droplets

Dal’Toé

Padoin

Ropelato³

et al. 2015

International Journal of Heat and Mass Transfer

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Towards a predictive evaporation model for multi-component hydrocarbon droplets at all pressure conditions

Cited by 73 publications

References 33 publications

Detailed modeling of the evaporation and thermal decomposition of urea‐water solution in SCR systems

Detailed modeling of the evaporation and thermal decomposition of urea‐water solution in SCR systems

Evaporation and dynamic characteristics of a high-speed droplet under transcritical conditions

Cross diffusion effects in the interfacial mass and heat transfer of multicomponent droplets

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