Droplet collision processes in an inter-spray impingement system

Ko, Gwon Hyun; Ryou, Hong Sun

doi:10.1016/j.jaerosci.2005.02.005

Cited by 43 publications

(18 citation statements)

References 16 publications

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“…According to the experimental studies by Brazier-Smith et al [58], Ashgriz and Poo [59] and Estrade et al [60], the outcomes from collision are generally classified into three types [61]: bouncing, coalescence, separation (reflexive separation and stretching separation). As shown in Figure 6, in order to determine the collision regimes, three dimensionless numbers are involved: the collision Weber number, We l , the droplet size ratio, 1 2 / r r , and the impact parameter, 1 2 / ( ) r r     , where  is the distance between the center of one drop and the relative velocity vector U rel , and r 1 and r 2 are the radii of small and large droplets, respectively.…”

Section: Collision and Coalescencementioning

confidence: 99%

“…Near the jet inlet, the atomization gas has an unchanged centerline velocity, but the peripheral velocity starts to decay. Figure 10 shows the numerical results with experimental data [61] for gas velocities along the flow centerline with the impinging plate against jet. The gas velocities are nondimensionalized by the nozzle exit velocity U 0 .…”

Section: Streamline and Pattern Of The Spray Fieldmentioning

confidence: 99%

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Modeling on effervescent atomization: A review

Qian

Lin

2011

Sci. China Phys. Mech. Astron.

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The study and modeling process of effervescent atomization are reviewed. The mechanism of droplet events and the treatment of liquid fragmentation process and dispersed particles are systematically presented, which includes the primary atomization of Newtonian and non-Newtonian fluid, instability analysis, turbulence treatment, particle tracking, secondary atomization and droplets collision. The review on the sub-models involved in the simulation of effervescence is followed by a summary of the achievements of modeling. First is the validation of models; then the parametric study is summarized; the third part introduces the fitting formula of droplet mean size and impinging factors, and finally the scope of future study is indicated. effervescent atomization spray, modeling, review PACS: 47.55.Ca, 47.55.df, 47.60.Kz ALR air-to-liquid ratio, by mass C D drag coefficient D noz nozzle diameter, m d d the droplet diameter, m e internal energy, J F force, N g gravity force, N k turbulent kinetic energy per unit mass k bu breakup frequency, s 1 k  wave number m  mass flow rate, kg/s m mass, kg p pressure kg s 2 /m Q heat source, J q heat flux vector r droplet radius, m Re Reynolds number Sr nterface velocity slip ratio SMD Sauter mean diameter, m U rel relative velocity vector, m/s u, v, w velocity, m/s x radial coordinate, m y axial coordinate, m Greek symbols  volume fraction of gas  deformation parameter  dynamic viscosity, kg/ms  density, kg/m 3  surface tension, kg/m 2  thickness sheet, m  growth rate  viscous dissipation rate, J/ms  distance between the center of one drop and U rel , m  drop oscillation frequency, /s  viscous shear stress tensor Subscript cr criteria g gas l liquid

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Section: Collision and Coalescencementioning

confidence: 99%

Section: Streamline and Pattern Of The Spray Fieldmentioning

confidence: 99%

Modeling on effervescent atomization: A review

Qian

Lin

2011

Sci. China Phys. Mech. Astron.

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“…Furthermore, Ashgriz and Poo (1990), Qian and Law (1997) and Brenn et al (2001) have reported that several satellite droplets are created during the separation processes. In regards to this phenomenon, the models for fragmenting collision, which consider the formation of satellite droplets, were recently developed by Georjon and Reitz (1999), Ko and Ryou (2005) and Munnannur and Reitz (2007).…”

Section: Introductionmentioning

confidence: 99%

Modeling of binary droplet collisions for application to inter-impingement sprays

Kim

Lee

2009

International Journal of Multiphase Flow

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“…The outcomes from collision could be generally classified into three types [33]: coalescence, grazing collision, and separation. In order to determine the collision regimes, three dimensionless number are involved: the collision Weber number, We l, the droplet size ratio, r 1 /r 2 , and the impact parameter, w = v/(r 1 ?…”

Section: Collision Modelmentioning

confidence: 99%

Numerical Modeling in Radio Frequency Suspension Plasma Spray of Zirconia Powders

Qian

Lin

Xiong

2010

Plasma Chem Plasma Process

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A comprehensive model was developed to investigate the suspension spraying for a radio frequency (RF) inductively coupled plasma torch. Firstly, the electromagnetic field is solved with the Maxwell equations and validated by the analytical solutions. Secondly, the plasma field with different power inputs is simulated by solving the governing equations of the fluid flow coupled with the RF heating. Then, the suspension droplets embedded with nano particles are modeled in a Lagrangian manner, considering feeding, collision, heating and evaporation of the suspension droplets, as well as tracking, acceleration, melting and evaporation of the nano or agglomerate particles. The noncontinuum effects and the influence of the evaporation on the heat transfer are considered. This particle model predicts the trajectory, velocity, temperature and size of the in-flight nano-or agglomerate particles. The effects of operating conditions and intial inputs on the particle characteristics are investigated. The statistical distributions of multiple particles' size, velocity, temperature are also discussed for the cases with and without consideration of suspension droplets collision. List of symbolsheat of evaporation (J kg -1 ) m Mass Nu Nusselt number Pr Prandtl number, Pr = m/a Q J Joule heating (W m -3 ) Q conv Convection heat (W m -3 ) Q rad Radiation heat loss (W m -3 ) Q vap Vaporization heat (W m -3 ) R Radius (nm) Sh Sherwood number r Radial coordinate (m) t Time (s) T Particle temperature (K)

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Droplet collision processes in an inter-spray impingement system

Cited by 43 publications

References 16 publications

Modeling on effervescent atomization: A review

Modeling on effervescent atomization: A review

Modeling of binary droplet collisions for application to inter-impingement sprays

Numerical Modeling in Radio Frequency Suspension Plasma Spray of Zirconia Powders

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