Models for automotive fuel droplets heating and evaporation

Qubeissi, Mansour Al; Sazhin, Sergei; Al-Esawi, Nawar Hasan Imran

doi:10.4995/ilass2017.2017.4754

Cited by 6 publications

(12 citation statements)

References 17 publications

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“…C 27 H 56 , C 27 H 54 (1, 4), increase with time at the expense of the lighter ones. This result is compatible with the findings presented in [7,11,18]. In some previous studies (e.g.…”

Section: Figuresupporting

confidence: 83%

“…The droplets are moving at 10 −1 in still air of pressure and temperature equal to 30bar and 800K, respectively. This assumption is compatible with those used in [17]. The evolutions of droplet surface temperatures ( ) and radii ( ) for three mixtures of diesel-biodiesel fuels (B5, B20, B50) and pure biodiesel fuel (B100) of 19 types of biodiesel fuels are analysed.…”

Section: Resultssupporting

confidence: 54%

“…The mixtures are treated as ideal gases. As in previous studies [7,10,11], blended fuel vapour is assumed to diffuse from the surface of the droplet, without changing its composition, based on averaged binary diffusion of diesel fuel vapour into dry air.…”

Section: Model and Fuel Compositionsmentioning

confidence: 99%

“…Following [10,11], the analysis of droplets heating and evaporation processes is made in application to several blends of diesel and biodiesel fuels. In contrast to previous approaches, the discrete component model (DCM) (described in [5,12] and validated experimentally in [13]) is used for this analysis; and the model is applied to a broad range of diesel-biodiesel fuel fractions.…”

Section: Model and Fuel Compositionsmentioning

confidence: 99%

“…where the diffusion coefficient of liquid species is linked with the liquid diffusion coefficient by the following equation of the Effective Diffusivity (ED) model [6,11]:…”

Section: Model and Fuel Compositionsmentioning

confidence: 99%

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Droplets heating and evaporation: an application to diesel-biodiesel fuel mixtures

Qubeissi

Al-Esawi

Sazhin

2017

Proceedings ILASS–Europe 2017. 28th Conference on Liquid Atomization and Spray Systems

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The heating and evaporation of automotive fuel droplets are crucial to the design of internal combustion engines and to ensuring their good performance. Accurate modelling is essential to the understanding of these processes and ultimately improving engine design. The interest in fossil-biodiesel fuel blends has been mainly stimulated by depletion of fossil fuels and the need to reduce carbon dioxide emissions that contribute towards climate change. This paper presents an analytical investigation into the application of discrete component model for the heating and evaporation of multi-component fuel droplets to several blended diesel-biodiesel fuels. The model considers the contribution of all groups of hydrocarbons in diesel fuel and methyl esters in biodiesel fuels. The main features of new application to the analysis of blended-fuel droplets in engine-like conditions is described. The model is applied to several blends of diesel, combining 98 components of hydrocarbons, and 19 types biodiesel fuels, combining up to 17 species of methyl ester, considering the differences in their chemical levels of saturation, and thermodynamic and transport properties. One important finding is that some fuel blends, e.g. B5 (5% biodiesel fuel and 95% diesel fuel), can give almost identical droplet lifetimes to the one predicted for pure diesel fuel; i.e. such mixtures can be directly used in conventional diesel engines with minimal, or no, modification to the droplet break-up process. KeywordsBiodiesel, Diesel, Fuel droplet, Fuel mixture, Heating and evaporation IntroductionRenewable sources of energy, such as biodiesel fuels, have been of great interest to scientists and public in the last decades due to depletion of fossil fuels and impact on global warming [1,2]. Also, compared to fossil fuel, biodiesel fuel has several advantages: it has less carbon dioxide emissions, higher flash point, higher lubricity and it is cost effective; in addition, the blend of diesel-biodiesel fuels can be used in diesel engines with minimal/no modifications [3,4]. The delay in processes preceding the onset of combustion (mainly the heating and evaporation of fuel droplets) in the internal combustion engines is crucial to the design and performance of these engines [5,6]. However, the complexity of modelling these processes should be taken into account as it involves detailed physics of heat transfer, mass transfer and fluid dynamics associated processes. In this paper, the discrete component model (DCM) (see [5][6][7]) is utilised to analyse the droplets heating and evaporation of diesel-biodiesel fuel blends. These blends are represented by a mixture of 19 types of biodiesel fuels with up to 17 species of methyl ester (see [8] for more details) and diesel fuel, formed of 98 hydrocarbons (see [7] for more details). The thermodynamic and transport properties of diesel fuel are inferred from [7]; while for properties of biodiesel fuel are taken from [9]. The contribution of species and average droplet temperatures are taken into account...

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“…C 27 H 56 , C 27 H 54 (1, 4), increase with time at the expense of the lighter ones. This result is compatible with the findings presented in [7,11,18]. In some previous studies (e.g.…”

Section: Figuresupporting

confidence: 83%

Section: Resultssupporting

confidence: 54%

Section: Model and Fuel Compositionsmentioning

confidence: 99%

Section: Model and Fuel Compositionsmentioning

confidence: 99%

“…where the diffusion coefficient of liquid species is linked with the liquid diffusion coefficient by the following equation of the Effective Diffusivity (ED) model [6,11]:…”

Section: Model and Fuel Compositionsmentioning

confidence: 99%

See 3 more Smart Citations

Droplets heating and evaporation: an application to diesel-biodiesel fuel mixtures

Qubeissi

Al-Esawi

Sazhin

2017

Proceedings ILASS–Europe 2017. 28th Conference on Liquid Atomization and Spray Systems

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The impacts of the activity coefficient on heating and evaporation of ethanol/gasoline fuel blends

Al-Esawi

Qubeissi

Sazhin

et al. 2018

International Communications in Heat and Mass Transfer

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The evolutions of droplet radii and temperatures for ethanol and gasoline fuels and their blends are investigated using a modified version of the Discrete Component (DC) model, taking into account the effect of the activity coefficient (AC). The universal quasi-chemical functional-group AC (UNIFAC) model is used to predict the ACs of the blended ethanol and gasoline fuels approximated by 21 components. In contrast to previous studies, it is shown that droplet lifetimes predicted for pure gasoline are not always shorter than those predicted for ethanol/gasoline blends. They depend on the total vapour pressure of the mixture. It is shown that the original DC model predicts ethanol/gasoline fuel droplet lifetimes with errors up to 5.7% compared to those predicted using the same model but with the ACs obtained from the UNIFAC model.

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Heating and Evaporation of Droplets of Multicomponent and Blended Fuels: A Review of Recent Modeling Approaches

et al. 2021

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In this review, recent models for the heating/evaporation of multicomponent and blended fuel droplets and their implementation into numerical codes, used for the analysis of the processes in internal combustion engines, are reviewed. In these models, the diffusion of species, recirculation, and temperature gradient inside droplets are considered. The focus of the review is on the group of models based on the implementation of the analytical solutions to the heat transfer and species diffusion equations inside droplets into numerical codes. Four key aspects are summarized: (1) application of the Discrete Component (DC) model and the Multi-Dimensional Quasi-Discrete Model (MDQDM) to a broad range of fuels, including petrol, diesel, ethanol, and biodiesel fuels and their blends, (2) formulation of fuel surrogates, with a focus on the recently introduced Complex Fuel Surrogate Model (CFSM), (3) overview of the recently introduced transient algorithm, Transient Multi-Dimensional Quasi-Discrete Model (TMDQDM), for an autogeneration of quasi-components, and (4) implementation of the latter into a computational fluid dynamics (CFD) code for a realistic engineering application to full cycle simulation in internal combustion engines. The original and modified versions of the DC model and MDQDM are evaluated for the heating and evaporation of droplets of bio/fossil-fuel (e.g., ethanol/petrol/biodiesel/diesel) blends. These were implemented into commercial CFD software and validated. The feasibility of formulating complex fuel surrogates for fuel blends, their implementation into CFD codes, and their application in the full engine cycle simulation before and after the onset of combustion (autoignition) are described.

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Models for automotive fuel droplets heating and evaporation

Cited by 6 publications

References 17 publications

Droplets heating and evaporation: an application to diesel-biodiesel fuel mixtures

Droplets heating and evaporation: an application to diesel-biodiesel fuel mixtures

The impacts of the activity coefficient on heating and evaporation of ethanol/gasoline fuel blends

Heating and Evaporation of Droplets of Multicomponent and Blended Fuels: A Review of Recent Modeling Approaches

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