Numerical analysis of the interactions between evaporating droplets in a monodisperse stream

Frackowiak, Bruno; Lavergne, G.; Tropea, Cameron; Strzelecki, Alain

doi:10.1016/j.ijheatmasstransfer.2009.12.018

Cited by 15 publications

(13 citation statements)

References 25 publications

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“…Moreover, they present similar decreases with time, due to the increase of the vapor flow rate, i.e. the surface temperature becomes hotter; hence the blowing effect induced by the Stefan flow increases [23]. The drag force appears to be larger for case 2.…”

Section: Analysis Of the Repartition Of The Forces And Influence Of Tmentioning

confidence: 71%

“…The present study is complementary to these previous investigations since it aims at comparing temperature fields obtained experimentally by two-color laser-induced fluorescence [15,19] and the DNS approach developed by Frackowiak et al [23]. The computational procedure and the experimental setup will be described first, followed by a detailed analysis based on two experimental cases of ethanol combusting droplets.…”

Section: Introductionmentioning

confidence: 94%

“…The numerical simulation is based on a two-way coupling between the external flow computations with the CFD software OpenFOAM [25], and an in-house code solving the time dependent Navier-Stokes equations for the internal fields of the droplet [23]. The configuration is axisymmetric, and the quasi-static evaporation hypothesis is adopted for evaluating the mass vapor flow rate per unit surface.…”

Section: Numerical Simulationmentioning

confidence: 99%

“…The steadiness is reached when the entrained air counteracts the vapor diffusion from the droplet surface. In order to simulate the practical case of a semiinfinite jet with a periodic condition, the same procedure as described in [23] is used. On the one hand, the evolution of the boundary layer is simulated at a larger scale by modeling the jet as a semi-infinite cylinder in a Lagrangian approach.…”

Section: Numerical Simulationmentioning

confidence: 99%

“…This phenomenon results from the dependence of the surface tension on the temperature, which creates an additional stress to the viscous one, accelerating or slowing down the liquid motion. More recently, Frackowiak et al [23] managed to simulate the case of a monodisperse droplet stream with DNS by imposing periodic conditions at the limits of the simulation domain containing two consecutive droplets. During the droplets cooling, Frackowiak et al [23] noticed that the Marangoni stress can be more significant than the viscous stress, splitting the liquid motion into two contra rotating vortices.…”

Section: Introductionmentioning

confidence: 99%

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et al. 2011

International Journal of Heat and Mass Transfer

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The temperature field within evaporating ethanol droplets is investigated, relying on the two-color laser induced fluorescence (LIF) measurement technique and on a Direct Numerical Simulation (DNS). The configuration studied corresponds to a monodisperse droplet stream in a diffusion flame sustained by the droplet vapor. An experimental probe volume, small compared to the droplet size, is used to characterize the temperature field within the droplets, whereas DNS takes into account key aspects of the droplet heating and evaporation such as the non-uniform and transient stress, and the mass and heat transfer coefficients at the droplet surface. These investigations reveal that the frictional stresses are strongly reduced due to the small spacing between the droplets. They also show that the Marangoni effect has a significant influence on the internal motion and hence on the internal temperature field.

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Section: Analysis Of the Repartition Of The Forces And Influence Of Tmentioning

confidence: 71%