Current status of droplet evaporation in turbulent flows

Birouk, Madjid; Gökalp, İskender

doi:10.1016/j.pecs.2006.05.001

Cited by 112 publications

(53 citation statements)

References 60 publications

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“…A more detailed description can be found in reference [3]. Equations (6) and (7) express that the vapor is transferred from the surface of the spherical droplet to the ambient in two stages. At first, the incoming heat increases the droplet temperature up to boiling.…”

Section: Calculation Of Droplet Evaporationmentioning

confidence: 99%

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Fuel Evaporation in an Atmospheric Premixed Burner: Sensitivity Analysis and Spray Vaporization

Csemány

Józsa

2017

Processes

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Calculation of evaporation requires accurate thermophysical properties of the liquid. Such data are well-known for conventional fossil fuels. In contrast, e.g., thermal conductivity or dynamic viscosity of the fuel vapor are rarely available for modern liquid fuels. To overcome this problem, molecular models can be used. Currently, the measurement-based properties of n-heptane and diesel oil are compared with estimated values, using the state-of-the-art molecular models to derive the temperature-dependent material properties. Then their effect on droplet evaporation was evaluated. The critical parameters were liquid density, latent heat of vaporization, boiling temperature, and vapor thermal conductivity where the estimation affected the evaporation time notably. Besides a general sensitivity analysis, evaporation modeling in a practical burner ended up with similar results. By calculating droplet motion, the evaporation number, the evaporation-to-residence time ratio can be derived. An empirical cumulative distribution function is used for the spray of the analyzed burner to evaluate evaporation in the mixing tube. Evaporation number did not exceed 0.4, meaning a full evaporation prior to reaching the burner lip in all cases. As droplet inertia depends upon its size, the residence time has a minimum value due to the phenomenon of overshooting.

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Section: Calculation Of Droplet Evaporationmentioning

confidence: 99%

“…There are numerous evaporation models available in the literature, see, e.g., [6][7][8][9][10]. Among them, the simplest one, the D 2 -law, developed by Spalding and Godsave [11,12] is used presently.…”

Section: Introductionmentioning

confidence: 99%

Fuel Evaporation in an Atmospheric Premixed Burner: Sensitivity Analysis and Spray Vaporization

Csemány

Józsa

2017

Processes

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“…While different correlations could be adopted, see for instance Lavender and Pei [39], Birouk and Gokalp [8] and Faeth [17], in the present work the Nusselt and Sherwood number are evaluated using the model of Ranz and Marshall [53,54]. This correlation, which is widely recognized to be accurate and straightforward to implement, is:…”

Section: Vaporisationmentioning

confidence: 99%

Large Eddy Simulation of Spark Ignition in a Gas Turbine Combustor

Jones

Tyliszczak

2010

Flow Turbulence Combust

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Ignition in an aircraft gas turbine combustion chamber is simulated using Large Eddy Simulation (LES) in conjunction with the filtered probability density function (pdf ) equation approach, which is solved using the Eulerian stochastic field method. The LES-pdf methodology is used for both dispersed (liquid) and gas phases. The liquid phase is described using a Lagrangian formulation whilst an Eulerian approach is employed for the gas phase. The spark energy deposition was mimicked by a distributed energy source term added to the enthalpy equation. Unsuccessful and successful ignition sequences have been simulated and the results suggest that spark 'size' is an important parameter in the ignition of kerosene fuelled combustion chambers.

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“…The evaporation behavior of isolated pure species droplet (suspended) has been extensively investigated (Birouk and Gökalp 2006;Law 1982). Less data are available for the similar setups but using real fuels.…”

Section: Introductionmentioning

confidence: 99%

Accurate analysis of multicomponent fuel spray evaporation in turbulent flow

et al. 2011

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The aim of this paper is to perform an accurate analysis of the evaporation of single component and binary mixture fuels sprays in a hot weakly turbulent pipe flow by means of experimental measurement and numerical simulation. This gives a deeper insight into the relationship between fuel composition and spray evaporation. The turbulence intensity in the test section is equal to 10%, and the integral length scale is three orders of magnitude larger than the droplet size while the turbulence microscale (Kolmogorov scales) is of same order as the droplet diameter. The spray produced by means of a calibrated droplet generator was injected in a gas flow electrically preheated. N-nonane, isopropanol, and their mixtures were used in the tests. The generalized scattering imaging technique was applied to simultaneously determine size, velocity, and spatial location of the droplets carried by the turbulent flow in the quartz tube. The spray evaporation was computed using a Lagrangian particle solver coupled to a gas-phase solver. Computations of spray mean diameter and droplet size distributions at different locations along the pipe compare very favorably with the measurement results. This combined research tool enabled further investigation concerning the influencing parameters upon the evaporation process such as the turbulence, droplet internal mixing, and liquid-phase thermophysical properties.

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Current status of droplet evaporation in turbulent flows

Cited by 112 publications

References 60 publications

Fuel Evaporation in an Atmospheric Premixed Burner: Sensitivity Analysis and Spray Vaporization

Fuel Evaporation in an Atmospheric Premixed Burner: Sensitivity Analysis and Spray Vaporization

Large Eddy Simulation of Spark Ignition in a Gas Turbine Combustor

Accurate analysis of multicomponent fuel spray evaporation in turbulent flow

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