My current research interest falls within thermofluids, most recently development of new mathematical models for the heating, evaporation and ignition of fuel blends and associated atomisation processes and physics. Other rersearch interests include: CFD development of numerical Conjugate Heat Transfer (CHT) models typical applications of which are the 3D rotating-cavities of gas-turbine engines, heat sinks, PV/T systems and conventional heat exchangers.
Proceedings ILASS–Europe 2017. 28th Conference on Liquid Atomization and Spray Systems
A model for heating and evaporation of mono- and multi-component droplets, based on analytical so... more A model for heating and evaporation of mono- and multi-component droplets, based on analytical solutions to the heat transfer and species diffusion equations in the liquid phase, is summarised. The implementation of the model into ANSYS Fluent via User-Defined Functions (UDF) is described. The model is applied to the analysis of pure acetone, ethanol, and mixtures of acetone/ethanol droplet heating/cooling and evaporation. The predictions of the customised version of ANSYS Fluent with the newly implemented UDF model are verified against the results predicted by the previously developed in house, one-dimensional code.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.4759
The previously developed approaches for fuel droplet heating and evaporation processes, mainly us... more The previously developed approaches for fuel droplet heating and evaporation processes, mainly using the Discrete Multi Component Model (DMCM), are investigated for the aerodynamic combustion simulation. The models have been recently improved and generalised for a broad range of bio-fossil fuel blends so that the application areas are broadened with an increased accuracy. The main distinctive features of these models are that they consider the impacts of species’ thermal conductivities and diffusivities within the droplets in order to account for the temperature gradient, transient diffusion of species and recirculation. A formulation of fuel surrogates is made using the recently introduced model, referred to as “Complex Fuel Surrogate Model (CFSM)”, and analysing their heating, evaporation and combustion characteristics. The CFSM is aimed to reduce the full composition of fuel to a much smaller number of components based on their mass fractions, and to formulate fuel surrogates. Su...
Previously developed droplet heating and evaporation models, taking into account temperature grad... more Previously developed droplet heating and evaporation models, taking into account temperature gradient, recirculation, and species diffusion within droplets, and their application to the analysis of commercial automotive fuel droplets are reviewed. It is shown that the most efficient analysis of Diesel fuel droplet heating and evaporation is based on the MDQD (multi-dimensional quasi-discrete) model, taking into account the contribution of all groups of hydrocarbons in automotive fuels. The main features of this model are summarised and its new application to the analysis of droplets in Diesel engine-like conditions, taking into account time-dependent velocities, is described. In the MDQD model, Diesel fuel is approximated by six groups of components: alkanes, cycloalkanes, bicycloalkanes, alkylbenzenes, indanes & tetralines, naphthalenes, and three characteristic components C19H34 (tricycloalkane), C13H12 (diaromatic), and C14H10 (phenanthrene). It is shown that errors in estimated ...
A detailed comparative analysis of transport and thermodynamic properties of biodiesel fuels and ... more A detailed comparative analysis of transport and thermodynamic properties of biodiesel fuels and components of these fuels is presented. Five types of biodiesel fuels are considered: Palm Methyl Ester, produced from palm oil; Hemp Methyl Esters, produced from hemp oil in the Ukraine and European Union; Rapeseed oil Methyl Ester, produced from rapeseed oil in the Ukraine; and Soybean oil Methyl Ester, produced from soybean oil. Up to 16 components (methyl esters in most cases) of these fuels are considered. The results are applied to the analysis of biodiesel fuel droplet heating and evaporation in conditions relevant to internal combustion engines, using the model described elsewhere.
This study focuses on preliminary analysis of the heating and evaporation processes in a spherica... more This study focuses on preliminary analysis of the heating and evaporation processes in a spherical moving droplet using Direct Numerical Simulation (DNS) and simplified modelling approaches. DNS of two-phase flows is used to obtain detailed information about heat and mass transfer at the interface. The DNS results are compared with the results predicted by the modelling approach, based on the analytical solution to the heat transfer equation inside the droplet. The latter approach takes into account the finite thermal conductivity and recirculation inside droplets using the effective thermal conductivity (ETC) model. The ETC model has been widely used by the scientific community since it was originally developed by Abramzon and Sirignano more than 25 years ago, although its range of applicability has never been rigorously investigated. The comparison between DNS and modelling results is performed for a wide range of Peclet numbers in the analysis of transient heating of droplets wit...
Proceedings ILASS–Europe 2017. 28th Conference on Liquid Atomization and Spray Systems
A model for heating and evaporation of mono- and multi-component droplets, based on analytical so... more A model for heating and evaporation of mono- and multi-component droplets, based on analytical solutions to the heat transfer and species diffusion equations in the liquid phase, is summarised. The implementation of the model into ANSYS Fluent via User-Defined Functions (UDF) is described. The model is applied to the analysis of pure acetone, ethanol, and mixtures of acetone/ethanol droplet heating/cooling and evaporation. The predictions of the customised version of ANSYS Fluent with the newly implemented UDF model are verified against the results predicted by the previously developed in house, one-dimensional code.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.4759
The previously developed approaches for fuel droplet heating and evaporation processes, mainly us... more The previously developed approaches for fuel droplet heating and evaporation processes, mainly using the Discrete Multi Component Model (DMCM), are investigated for the aerodynamic combustion simulation. The models have been recently improved and generalised for a broad range of bio-fossil fuel blends so that the application areas are broadened with an increased accuracy. The main distinctive features of these models are that they consider the impacts of species’ thermal conductivities and diffusivities within the droplets in order to account for the temperature gradient, transient diffusion of species and recirculation. A formulation of fuel surrogates is made using the recently introduced model, referred to as “Complex Fuel Surrogate Model (CFSM)”, and analysing their heating, evaporation and combustion characteristics. The CFSM is aimed to reduce the full composition of fuel to a much smaller number of components based on their mass fractions, and to formulate fuel surrogates. Su...
Previously developed droplet heating and evaporation models, taking into account temperature grad... more Previously developed droplet heating and evaporation models, taking into account temperature gradient, recirculation, and species diffusion within droplets, and their application to the analysis of commercial automotive fuel droplets are reviewed. It is shown that the most efficient analysis of Diesel fuel droplet heating and evaporation is based on the MDQD (multi-dimensional quasi-discrete) model, taking into account the contribution of all groups of hydrocarbons in automotive fuels. The main features of this model are summarised and its new application to the analysis of droplets in Diesel engine-like conditions, taking into account time-dependent velocities, is described. In the MDQD model, Diesel fuel is approximated by six groups of components: alkanes, cycloalkanes, bicycloalkanes, alkylbenzenes, indanes & tetralines, naphthalenes, and three characteristic components C19H34 (tricycloalkane), C13H12 (diaromatic), and C14H10 (phenanthrene). It is shown that errors in estimated ...
A detailed comparative analysis of transport and thermodynamic properties of biodiesel fuels and ... more A detailed comparative analysis of transport and thermodynamic properties of biodiesel fuels and components of these fuels is presented. Five types of biodiesel fuels are considered: Palm Methyl Ester, produced from palm oil; Hemp Methyl Esters, produced from hemp oil in the Ukraine and European Union; Rapeseed oil Methyl Ester, produced from rapeseed oil in the Ukraine; and Soybean oil Methyl Ester, produced from soybean oil. Up to 16 components (methyl esters in most cases) of these fuels are considered. The results are applied to the analysis of biodiesel fuel droplet heating and evaporation in conditions relevant to internal combustion engines, using the model described elsewhere.
This study focuses on preliminary analysis of the heating and evaporation processes in a spherica... more This study focuses on preliminary analysis of the heating and evaporation processes in a spherical moving droplet using Direct Numerical Simulation (DNS) and simplified modelling approaches. DNS of two-phase flows is used to obtain detailed information about heat and mass transfer at the interface. The DNS results are compared with the results predicted by the modelling approach, based on the analytical solution to the heat transfer equation inside the droplet. The latter approach takes into account the finite thermal conductivity and recirculation inside droplets using the effective thermal conductivity (ETC) model. The ETC model has been widely used by the scientific community since it was originally developed by Abramzon and Sirignano more than 25 years ago, although its range of applicability has never been rigorously investigated. The comparison between DNS and modelling results is performed for a wide range of Peclet numbers in the analysis of transient heating of droplets wit...
This study focuses on preliminary analysis of the heating and evaporation processes in a spherica... more This study focuses on preliminary analysis of the heating and evaporation processes in a spherical moving droplet using Direct Numerical Simulation (DNS) and simplified modelling approaches. DNS of two-phase flows is used to obtain detailed information about heat and mass transfer at the interface. The DNS results are compared with the results predicted by the modelling approach, based on the analytical solution to the heat transfer equation inside the droplet. The latter approach takes into account the finite thermal conductivity and recirculation inside droplets using the effective thermal conductivity (ETC) model. The ETC model has been widely used by the scientific community since it was originally developed by Abramzon and Sirignano more than 25 years ago, although its range of applicability has never been rigorously investigated. The comparison between DNS and modelling results is performed for a wide range of Peclet numbers in the analysis of transient heating of droplets without evaporation. A DNS database has been created. DNS results are shown to be rather different from the modelling results when the model is used for relatively low Peclet numbers. These results, however, turned out to be in good agreement for relatively high Peclet numbers.
The main features of the previously developed model for two-component droplet heating and evapora... more The main features of the previously developed model for two-component droplet heating and evaporation into a neutral gas (nitrogen) are summarised. The results of functionality testing of this model for heat and mass transfer between two parallel plates are reviewed. New results of the application of the model to the analysis of a twocomponent (n-dodecane and p-dipropylbenzene) droplet’s heating and evaporation in a high pressure background gas (nitrogen) in Diesel engine-like conditions are presented. As in the case of the previously developed similar models, the model used in the analysis is based on the introduction of the kinetic region in the immediate vicinity of the droplets and the hydrodynamic region. The model is tested for the analysis of heating and evaporation of a droplet with initial radius and temperature equal to 5 μm and 300 K, respectively, immersed into gas with temperatures 1000 K and 700 K for several mixtures of n-dodecane and p-dipropylbenzene. It is shown that the increase in mass fraction of p-dipropylbenzene and kinetic effects lead to the increase in predicted droplet evaporation time. It is shown that the kinetic effects increase with increasing gas temperature and molar fraction of p-dipropylbenzene.
Previously developed droplet heating and evaporation models, taking into account temperature grad... more Previously developed droplet heating and evaporation models, taking into account temperature gradient, recirculation, and species diffusion within droplets, and their application to the analysis of commercial automotive fuel droplets are reviewed. It is shown that the most efficient analysis of Diesel fuel droplet heating and evaporation is based on the MDQD (multi-dimensional quasi-discrete) model, taking into account the contribution of all groups of hydrocarbons in automotive fuels. The main features of this model are summarised and its new application to the analysis of droplets in Diesel engine-like conditions, taking into account time-dependent velocities, is described. In the MDQD model, Diesel fuel is approximated by six groups of components: alkanes, cycloalkanes, bicycloalkanes, alkylbenzenes, indanes & tetralines, naphthalenes, and three characteristic components C19H34 (tricycloalkane), C13H12 (diaromatic), and C14H10 (phenanthrene). It is shown that errors in estimated temperatures and evaporation times in typical Diesel engine conditions, using the approximation of Diesel fuel by 15 quasi-components/components compared to the case when all 98 components are taken into account, are up to 1% and 3%, respectively. This is acceptable in most engineering applications. This approximation has also reduced CPU time by about 6 times compared with the case when the contribution of 98 components is taken into account. The approximations of Diesel fuel with n-dodecane (widely used in engineering modelling) and 20 alkane components lead to under-prediction of the evaporation time by over 50% and 22%, respectively.
"A detailed comparative analysis of transport and thermodynamic properties of biodiesel fuels and... more "A detailed comparative analysis of transport and thermodynamic properties of biodiesel fuels and
components of these fuels is presented. Five types of biodiesel fuels are considered: Palm Methyl
Ester, produced from palm oil; Hemp Methyl Esters, produced from hemp oil in the Ukraine and
European Union; Rapeseed oil Methyl Ester, produced from rapeseed oil in the Ukraine; and Soybean
oil Methyl Ester, produced from soybean oil. Up to 16 components (methyl esters in most cases) of
these fuels are considered. The results are applied to the analysis of biodiesel fuel droplet heating and
evaporation in conditions relevant to internal combustion engines, using the model described
elsewhere."
This book documents pioneering mathematical models introduced for the simulation of multi-compone... more This book documents pioneering mathematical models introduced for the simulation of multi-component droplets heating and evaporation processes which are implementable into commercial CFD codes. These models, described as multi-dimensional quasi discrete` (MDQD) and discrete-component` models, were applied to automotive fuel droplets in experimentally measured internal combustion engine conditions for biodiesel, diesel, and gasoline fuels. For instance, it is shown that the suggested models lead to accurate predictions of temperatures and evaporation times in typical diesel and gasoline engine conditions. Such models have also reduced CPU time about 85% compared with cases when classical approaches are used.
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Papers by Mansour Al Qubeissi
neutral gas (nitrogen) are summarised. The results of functionality testing of this model for heat and mass transfer
between two parallel plates are reviewed. New results of the application of the model to the analysis of a twocomponent
(n-dodecane and p-dipropylbenzene) droplet’s heating and evaporation in a high pressure background
gas (nitrogen) in Diesel engine-like conditions are presented. As in the case of the previously developed similar
models, the model used in the analysis is based on the introduction of the kinetic region in the immediate vicinity of
the droplets and the hydrodynamic region. The model is tested for the analysis of heating and evaporation of a droplet
with initial radius and temperature equal to 5 ÎĽm and 300 K, respectively, immersed into gas with temperatures 1000
K and 700 K for several mixtures of n-dodecane and p-dipropylbenzene. It is shown that the increase in mass
fraction of p-dipropylbenzene and kinetic effects lead to the increase in predicted droplet evaporation time. It is shown
that the kinetic effects increase with increasing gas temperature and molar fraction of p-dipropylbenzene.
components of these fuels is presented. Five types of biodiesel fuels are considered: Palm Methyl
Ester, produced from palm oil; Hemp Methyl Esters, produced from hemp oil in the Ukraine and
European Union; Rapeseed oil Methyl Ester, produced from rapeseed oil in the Ukraine; and Soybean
oil Methyl Ester, produced from soybean oil. Up to 16 components (methyl esters in most cases) of
these fuels are considered. The results are applied to the analysis of biodiesel fuel droplet heating and
evaporation in conditions relevant to internal combustion engines, using the model described
elsewhere."