Analysis of a Two-Fluid Sprayer and Its Use to Develop the Number Size Distribution Moments Spray Model, Part I: Experimental Analysis

Emekwuru, Nwabueze; Watkins, A. P.

doi:10.1615/atomizspr.v20.i6.10

Cited by 8 publications

(30 citation statements)

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“…A water spray study, using a twin-fluid sprayer typically used in agricultural spraying processes, was presented by Emekwuru & Watkins (2010a). In the study, the characteristics of the water spray are defined by the droplet size data obtained using a laser-diffraction-based measuring instrument.…”

Section: Discussion Of Application To Water Spraysmentioning

confidence: 99%

“…A Gamma distribution function is used in these sub-models. The three-moments model of Emekwuru & Watkins (2010b) is the third moments spray model, and the last three moments of the droplet size distribution are calculated from transport equations while the first moment is calculated from a Gamma distribution function which is also used for the three other areas in the spray model that require a distribution as in the four-moments model. The general Gamma distribution used in the three moments model is given by…”

Section: Droplet Size Distribution Functions Used In the Moments Spramentioning

confidence: 99%

“…These transport equations have been described by Emekwuru & Watkins (2010b). The first moment of the droplet size distribution, 0 Q , is obtained from the Gamma size distribution function.…”

Section: Application Of the Gamma Distribution To The Moments Spray Mmentioning

confidence: 99%

“…Figure 1 presents a volume frequency distribution and a cumulative volume distribution for a water spray (Emekwuru, 2007).…”

Section: Representation Of Droplet Size Distributions 21 Introductionmentioning

confidence: 99%

“…Droplet size distribution showing both the cumulative volume distribution and the volume frequency distribution. These have been obtained from a water spray at 103 kPa atomizing pressure from a 3.52 mm diameter nozzle at an axial distance 275 mm from the nozzle using a laser-diffraction based droplet analyzer (Emekwuru, 2007). …”

Section: Representation Of Droplet Size Distributions 21 Introductionmentioning

confidence: 99%

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Using the General Gamma Distribution to Represent the Droplet Size Distribution in a Spray Model

Emekwuru¹

2012

Hydrodynamics - Theory and Model

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Section: Discussion Of Application To Water Spraysmentioning

confidence: 99%

Section: Droplet Size Distribution Functions Used In the Moments Spramentioning

confidence: 99%

Section: Application Of the Gamma Distribution To The Moments Spray Mmentioning

confidence: 99%

“…Figure 1 presents a volume frequency distribution and a cumulative volume distribution for a water spray (Emekwuru, 2007).…”

Section: Representation Of Droplet Size Distributions 21 Introductionmentioning

confidence: 99%

Section: Representation Of Droplet Size Distributions 21 Introductionmentioning

confidence: 99%

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Using the General Gamma Distribution to Represent the Droplet Size Distribution in a Spray Model

Emekwuru¹

2012

Hydrodynamics - Theory and Model

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Validation of Σ−yliq Atomization Model in Pressure Swirl Atomizer

Amedorme¹,

Roselina

2022

Int. J. Eng. Tech. Mgmt. Res.

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In many combustion and agricultural applications atomizers are used to increase the surface area of the liquid to ensure high rates of mixing and improve evaporation. The most common, simple, and reliable atomizer is the pressure swirl atomizer. This atomizer is said to have quality and effective atomization compared to others and induces swirling motion to the liquid and gives a hollow cone spray with air core as it emerges from the exit orifice. To enhance the understanding and prediction of the atomizing characteristics various atomization models are used and need to be investigated experimentally. This paper presents a validation of the Σ−Yliq atomization model of two-phase flow in a pressure swirl atomizer using commercial CFD star-cd code and laser-diffraction based drop measurements. To obtain the best results for the droplet mean diameter between the prediction and the experiment in terms of turbulence different k-e models were evaluated. The results show that the computational predictions of Sauter Mean Diameter (SMD) for the model have a good agreement with most of the experimental measurements in the radial positions when standard k-ɛ turbulence was used. However, more divergence was observed between the predictions and the experimental measurements when the RNG and Realizable k-ɛ turbulence models were used in the predictions. It was also observed that the model has good agreement with the mean droplet measurements on the spray centreline and radial axis with a percentage error of less than five percent.

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Experimental Study of Mean Droplet Size From Pressure Swirl Atomizer

Amedorme

2020

Int. J. Eng. Sci. Tech

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This experimental study undertakes the measurements of droplet Sauter Mean Diameter (SMD) at different axial distances for the hollow-cone nozzle and different radial distances from the spray centreline using a laser-diffraction-based drop size analyser in order to validate atomization model. The study also investigates the influence of injection pressure and the evaluation of two exit orifice diameters on the Sauter Mean Diameter (SMD). The drop size distributions along the nozzle centreline as well as the radial drop distributions from spray centreline are also evaluated. To enhance the physics of liquid sheet instability and liquid film breakup mechanisms, visualization of liquid film breakup as a function of injection pressure was carried out. The results show that mean droplet size (SMD) increases in the axial distance on the spray centreline but decreases with an increasing injection pressure on the spray centreline. It was observed that larger sized drops occupy the spray periphery compared to those occupying the spray core. For the nozzle exit orifice diameters of 3.5 mm and 1.5 mm, the results show that the small nozzle exhibits smaller SMDs than the bigger nozzle and the break-up lengths are different for the two nozzles. The drop size distributions at radial positions showed an increase in droplet formation through the spray downstream distances and become more uniform. The visualisation of the spray was carried out using high-speed camera and it was noted that a well-defined hollow-cone spray was captured and that the spray angle increases with the injection pressure but reduces with the liquid film length.

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Analysis of a Two-Fluid Sprayer and Its Use to Develop the Number Size Distribution Moments Spray Model, Part I: Experimental Analysis

Cited by 8 publications

References 0 publications

Using the General Gamma Distribution to Represent the Droplet Size Distribution in a Spray Model

Using the General Gamma Distribution to Represent the Droplet Size Distribution in a Spray Model

Validation of Σ−yliq Atomization Model in Pressure Swirl Atomizer

Experimental Study of Mean Droplet Size From Pressure Swirl Atomizer

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