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Alessio Frassoldati
Polytechnic University of Milan
212Publications
34H-index
3,928Citations
Publications 212
Newest
Abstract A detailed analysis on the evaporation of acetic acid and ethylene glycol droplets is performed experimentally and numerically. The isolated droplet is positioned in a combustion chamber, suspended on a thermocouple and evaporated in buoyancy driven convection, following the thermal history throughout the droplet lifetime. The experiments provide quantitative and qualitative data on the evaporation physics of acetic acid, ethylene glycol and their mixture. The data are then modeled adop...
Abstract Despite the recent interest in large carboxylic acid oxidation due to their presence in pyrolysis bio-oils, their kinetics of pyrolysis and oxidation has not been experimentally addressed. For the first time, this paper reports a new set of experimental data for the oxidation in a jet-stirred reactor of two high molecular weight carboxylic acids: butanoic (butyric) and pentanoic (valeric) acids. This work was performed at 106.7 kPa (800 Torr) over a range of temperatures from 800 to 110...
#1Warumporn Pejpichestakul (Polytechnic University of Milan)H-Index: 2
#2Alessio Frassoldati (Polytechnic University of Milan)H-Index: 34
Last.T. Faravelli (Polytechnic University of Milan)H-Index: 43
view all 4 authors...
ABSTRACTCombustion-generated nanoparticles cause detrimental effects to not only health and environment but also combustion efficiency. A detailed kinetic mechanism employing a discrete sectional model is validated using experimental data obtained in laminar counterflow diffusion flames of ethylene/oxygen/nitrogen. Two configurations, named Soot formation (SF) and soot formation/oxidation (SFO) flames, are modeled using one-dimensional simulations. Radiative heat losses reduce the maximum flame ...
#1Andrea Bertolino (Polytechnic University of Milan)
#2Alessandro Stagni (Polytechnic University of Milan)H-Index: 8
Last.Alessio Frassoldati (Polytechnic University of Milan)H-Index: 34
view all 6 authors...
Abstract In this work, the flammable range of several hydrocarbons was predicted using a freely-propagating flame method for pure hydrocarbons and their mixtures, investigating the effects of operating conditions, in terms of temperature, pressure, fuel/oxidizer composition. The model showed accurate agreement with a wide set of experimental data. The average deviation between the experiments and the model was reduced to ∼20% for the UFL of methanol, methane, ethane, propane, n-butane, n-heptane...
#1Warumporn Pejpichestakul (Polytechnic University of Milan)H-Index: 2
#2Alberto Cuoci (Polytechnic University of Milan)H-Index: 27
Last.T. Faravelli (Polytechnic University of Milan)H-Index: 43
view all 6 authors...
Abstract Polycyclic aromatic hydrocarbons (PAHs) are known as soot precursors, but their formation/consumption is not fully understood. A recent comprehensive experimental study of premixed laminar ethylene flame [23] investigated the transition from gas-phase to soot particles. The complex fluid dynamics of this system is taken into account to compare model predictions with experimental measurements and thus further validate a detailed kinetic mechanism of soot formation. The relatively low inl...
#1R. Calabria (National Research Council)
#2Fabio Chiariello (National Research Council)H-Index: 6
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#1G.L. Tufano (University of Stuttgart)H-Index: 3
#2O.T. Stein (University of Stuttgart)H-Index: 12
Last.C. Hasse (Technische Universität Darmstadt)H-Index: 23
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Abstract Fully-resolved simulations of the heating, ignition, volatile flame combustion and char conversion of single coal particles in convective gas environments are conducted and compared to experimental data (Molina and Shaddix, 2007). This work extends a previous computational study (Tufano et al., 2016) by adding a significant level of model fidelity and generality, in particular with regard to the particle interior description and heterogeneous kinetics. The model considers the elemental ...
#1A.E. Saufi (Leonardo)
#2Alessio Frassoldati (Leonardo)H-Index: 34
Last.Alberto Cuoci (Leonardo)H-Index: 27
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Abstract This paper aims at presenting the DropletSMOKE++ solver, a comprehensive multidimensional computational framework for the evaporation of fuel droplets, under the influence of a gravity field and an external fluid flow. The Volume Of Fluid (VOF) methodology is adopted to dynamically track the interface, coupled with the solution of energy and species equations. The evaporation rate is directly evaluated based on the vapor concentration gradient at the phase boundary, with no need of semi...
#1Warumporn Pejpichestakul (Polytechnic University of Milan)H-Index: 2
#2E. Ranzi (Polytechnic University of Milan)H-Index: 49
Last.T. Faravelli (Polytechnic University of Milan)H-Index: 43
view all 7 authors...
Abstract The primary objective of the present work is to collect and review the vast amount of experimental data on rich laminar premixed flames of hydrocarbon fuels reported in recent years, and to analyze them by using a detailed kinetic mechanism, identifying aspects of the mechanism of PAH and soot formation requiring further revisions. The kinetic assessment was hierarchically conducted, with the progressive extension of the core C 0 –C 2 NUIG mechanism up to the CRECK kinetic mechanism of ...
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