New approaches to numerical modelling of droplet transient heating and evaporation

Sazhin, Sergei; Abdelghaffar, W.A.; Крутицкий, П. А.; Sazhina, Elena; Heikal, Morgan

doi:10.1016/j.ijheatmasstransfer.2005.04.007

Cited by 78 publications

(49 citation statements)

References 41 publications

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“…These results confirm our previous conclusion (see [9,10,12]) that this model can be recommended for implementation in CFD codes and used for multidimensional modelling of spray heating and evaporation based on these codes.…”

Section: Discussionsupporting

confidence: 90%

“…The analysis by these authors was based on the numerical solution of the heat conduction equation inside droplets. An alternative approach was suggested and developed in [8][9][10][11][12][13]. In these papers both finite liquid thermal conductivity and recirculation inside droplets (via the effective thermal conductivity (ETC) model [14]) were taken into account by incorporating the analytical solution to the heat conduction equation inside the droplet into the numerical scheme.…”

Section: Introductionmentioning

confidence: 99%

“…The preliminary validation of the model developed in [8][9][10][11][12] against published experimental data was reported in [9]. This validation, however, was limited to the comparison of predicted and calculated droplet diameters or global characteristics such as the ignition delay.…”

Section: Introductionmentioning

confidence: 99%

“…The experimental data used in our analysis are the same as earlier reported in [15]. These data were used in [15] for validation of the model different from the one developed in [8][9][10][11][12] (see [16,17]). Hence, this paper is complementary to both earlier published papers [6,15].…”

Section: Introductionmentioning

confidence: 99%

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Monodisperse monocomponent fuel droplet heating and evaporation

Kristyadi

Deprédurand

Castanet

et al. 2010

Fuel

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a b s t r a c tThe results of numerical and experimental studies of heating and evaporation of monodisperse acetone, ethanol, 3-pentanone, n-heptane, n-decane and n-dodecane droplets in an ambient air of fixed temperature and atmospheric pressure are reported. The numerical model took into account the finite thermal conductivity of droplets and recirculation inside them based on the effective thermal conductivity model and the analytical solution to the heat conduction equation inside droplets. The effects of interaction between droplets are taken into account based on the experimentally determined corrections to Nusselt and Sherwood numbers. It is pointed out that the interactions between droplets lead to noticeable reduction of their heating in the case of ethanol, 3-pentanone, n-heptane, n-decane and n-dodecane droplets, and reduction of their cooling in the case of acetone. Although the trends of experimentally observed droplet temperatures and radii are the same as predicted by the model taking into account the interaction between droplets, the actual values of the predicted droplet temperatures can differ from the observed ones by up to about 8 K, and the actual values of the predicted droplet radii can differ from the observed ones by up to about 2%. It is concluded that the effective thermal conductivity model, based on the analytical solution to the heat conduction equation inside droplets, can predict the observed average temperature of droplets with possible errors not exceeding several K, and observed droplet radii with possible errors not exceeding 2% in most cases. These results allow us to recommend the implementation of this model into CFD codes and to use it for multidimensional modelling of spray heating and evaporation based on these codes.

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Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Monodisperse monocomponent fuel droplet heating and evaporation

Kristyadi

Deprédurand

Castanet

et al. 2010

Fuel

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“…D iv is the diffusion coefficient of species i in air, Sh iso (i) was defined by (21) replacing B M with B M i . Remembering (15) one can see that B M = B M i .…”

Section: Droplet Evaporationmentioning

confidence: 99%

Modelling of biodiesel fuel droplet heating and evaporation

Sazhin

Qubeissi

Kolodnytska

et al. 2014

Fuel

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112

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Biodiesel fuel droplet heating and evaporation is investigated using the previously developed models, taking into account temperature gradient, recirculation, and species diffusion within droplets. The analysis is focused on four types of biodiesel fuels: Palm Methyl Ester, Hemp Methyl Esters, Rapeseed oil Methyl Ester, and Soybean oil Methyl Ester. These fuels contain up to 15 various methyl esters and possibly small amounts of unspecified additives, which are treated as methyl esters with some average characteristics. Calculations are performed using two approaches: 1) taking into account the contribution of all components of biodiesel fuels (up to 16); and 2) assuming that these fuels can be treated as a one component fuel with averaged transport and thermodynamic coefficients. It is pointed out that for all types of biodiesel fuel the predictions of the multi-component and single component models are rather close (the droplet evaporation times predicted by these models differ by less than about 5.5%). This difference is much smaller than observed in the case of Diesel and gasoline fuel droplets, and is related to the 1 Corresponding author, e-mail: S.Sazhin@brighton.ac.uk Preprint submitted to FuelMarch 28, 2013 fact that in the case of Diesel and gasoline fuel droplets the contribution of components in a wide range of molar masses and enthalpies of evaporation needs to be taken into account, while in the case of biodiesel fuels the main contribution comes from the components in a narrow range of molar masses and enthalpies of evaporation. As in the case of Diesel and gasoline fuel droplets, the multi-component model predicts higher droplet surface temperature and longer evaporation times than the single component model.

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