Film Thickness, Droplet Size Measurements and Correlations for Large Pressure-Swirl Atomizers

Benjamin, M.; Mansour, Adel; Samant, U. G.; Jha, S.; Liao, Y.; Harris, Thomas J.; Jeng, San‐Mou

doi:10.1115/98-gt-537

Cited by 20 publications

(13 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…He found that the discharge coef cient increases with atomizer constant K , L s / D s , and D s / d o , and decreasesslightly with l o / d o . Recent resultsof Benjamin et al 10 show that these effects are sensitiveto the range of parameter values considered. They have presented correlations for discharge coef cient, lm thickness, and spray angle for large-scale simplex nozzles.…”

mentioning

confidence: 96%

Parametric Study of Simplex Fuel Nozzle Internal Flow and Performance

et al. 2000

Self Cite

View full text Add to dashboard Cite

A numerical study is presented of the effects of changes in simplex nozzle geometry on its performance. A computational model based on the arbitrary-Lagrangian-Eulerianmethod with an adaptive grid-generation scheme is used. Three nondimensional geometric parameters are studied: the length-to-diameter ratio of the swirl chamber L s /D s and ori ce l o /d o and the swirl-chamber-diameter-to-exit-ori ce-diameter ratio D s /d o . The variations in the atomizer performance, caused by the changes in the geometric parameters, are presented in terms of the lm thickness at the exit of the ori ce, the spray cone angle, and the discharge coef cient. Results indicate that these geometric parameters have a signi cant effect on the internal ow and performance of simplex nozzles. With a constant mass ow through the nozzle over the range of parameters considered, an increase in L s /D s produces an increase in the lm thickness at the ori ce exit, a decrease in the spray cone half-angle, and a slight decrease followed by an increase in the discharge coef cient. Conversely, increasing l o /d o decreases lm thickness, spray cone angle, and discharge coef cient. An increase in D s /d o results in a decrease in lm thickness and discharge coef cient and a decrease in spray cone angle. Nomenclaturechamber diameter, m d o = exit-ori ce diameter, m K = atomizer geometric constant, A p / ( D s d o ) L s = swirl-chamber length, m l o = ori ce length, m m = vertex mass Çm = mass-ow rate, kg/s p = mean pressure, N/m 2 p 1 = ambient pressure, N/m 2 R 1 , R 2 = radii of curvature, m r = radial coordinate, m t = time, s t s = lm thickness, m t ¤ s = dimensionless lm thickness, t s / (d o / 2) u = axial velocity, m/s v = radial velocity, m/s w = swirl velocity, m/s x = axial coordinate, m D p = pressure differential, N/m 2 h = spray cone half-angle, deg l = dynamic viscosity, kg m/s l t = turbulent dynamic viscosity, kg m/s q = uid density, kg/m 3 r = surface tension, N/m

show abstract

mentioning

confidence: 96%

Parametric Study of Simplex Fuel Nozzle Internal Flow and Performance

et al. 2000

Self Cite

View full text Add to dashboard Cite

show abstract

“…They have used the Bloor and Ingham [11] analysis for the boundary-layer flow above a flat disk and they estimated the proportion of the fluid that enters the orifice through the boundary layer. Benjamin et al [12] have investigated the effects of various geometric and flow parameters on the performance of large-scale pressure swirl atomizers using optical methods. In 2001 Hansen et al [13] simulated the Newtonian fluid flow in a scaled model of a pressure-swirl atomizer via commercially available CFX-4.3 code.…”

Section: Figure1: Schematic View Of a Pressure-swirlmentioning

confidence: 99%

Modeling of Non-Newtonian Fluid Flow Within Simplex Atomizers

Rezaeimoghaddam

Elahi

Razavi

et al. 2010

ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, Volume 3

View full text Add to dashboard Cite

In this paper the Volume-of-Fluid (VOF) method is used to simulate Newtonian and non-Newtonian fluid flow within simplex (pressure-swirl) atomizers. The two-dimensional axisymmetric swirl Navier-Stokes equations coupled with the VOF method is employed for accounting the formation mechanism of the liquid film inside the swirl chamber and the orifice hole of the pressure swirl atomizer. For verification of the code, the numerical results were compared with experimental data for large scale prototype injector with water (Newtonian fluid) as injection fluid in various constant inlet mass flow rate. By using power-law equation to calculate shear stress terms in the Navier-Stokes equations, the code is extended to compute Newtonian and non-Newtonian fluid flow inside the atomizer. The time-independent purely viscous power-law fluids flow in pressure-swirl atomizers is simulated. The effects of shear-thinning fluids (0.5 < n <1), viscous Newtonian (n = 1) fluids and shear thickening fluids (1< n < 1.5) on atomizers performance (discharge coefficient and spray cone angle) were investigated. Results were shown that with increasing the power-law index the spray cone angle decreases and the discharge coefficient increases.

show abstract

“…To validate their code, experiments were conducted on a large scale prototype nozzle using Particle-Image-Velocimetry (PIV) and Laser-DopplerVelocimetry (LDV) methods and high speed digital camera [45]. Detailed comparison of experimental measurements/empirical correlations [46,47,48] and computational results was carried out which showed excellent agreement. The validated computational code was then used to investigate the effects of atomizer geometry under two flow regimes -constant mass flow rate through the atomizer [34,36,45,49] and constant pressure drop across the atomizer [35].…”

Section: Figurementioning

confidence: 99%

Trends in Comprehensive Modeling of Spray Formation

Tharakan

Mukhopadhyay

Datta

et al. 2013

International Journal of Spray and Combustion Dynamics

View full text Add to dashboard Cite

Comprehensive modeling of spray formation in liquid fuel injectors involves modeling of (i) internal hydrodynamics of fuel injector (ii) break up of liquid sheet leading to primary and secondary atomization and (iii) prediction of size and velocity distributions of droplets in the spray. Comprehensive models addressing all the three aspects are rare though some work has been reported that incorporate two of the three aspects. However, significant volume of literature exists on the individual modules. In the present work, progress and current trends in the individual modules have been extensively reviewed and their implications on development of comprehensive models have been discussed. The unresolved issues and future research directions are also indicated.

show abstract

Film Thickness, Droplet Size Measurements and Correlations for Large Pressure-Swirl Atomizers

Cited by 20 publications

References 1 publication

Parametric Study of Simplex Fuel Nozzle Internal Flow and Performance

Parametric Study of Simplex Fuel Nozzle Internal Flow and Performance

Modeling of Non-Newtonian Fluid Flow Within Simplex Atomizers

Trends in Comprehensive Modeling of Spray Formation

Contact Info

Product

Resources

About