Experiments on Air-Blast Atomization of Viscoelastic Liquids, Part 1: Quiescent Conditions

Li, Larry K.B.; Dressler, Daniel M.; Green, Sheldon; Davy, Martin; Eadie, Donald T.

doi:10.1615/atomizspr.v19.i2.30

Cited by 15 publications

(13 citation statements)

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“…From these data, and knowing the values of fluid viscosity and relaxation time from rheometry, one can easily calculate Reynolds, Deborah, and Elasticity numbers at a certain pressure difference. Similar findings were reported about atomized droplet sizes for elastic liquids in Li et al 1 and postimpact droplet sizes in the case of elastic droplet impact on a moving surface by Dressler et al 3 Figures 10 and 11 show the splash/nonsplash data for elastic liquid jet impaction on smooth and rough surfaces in terms of Deborah and Reynolds numbers. Figure 8 shows two photos of elastic liquid jet impaction.…”

Section: Resultssupporting

confidence: 77%

“…Furthermore, in the elastic liquid cases thin films or ligaments connect the droplets together; these filaments do not exist in the Newtonian splash cases. Similar findings were reported about atomized droplet sizes for elastic liquids in Li et al 1 and postimpact droplet sizes in the case of elastic droplet impact on a moving surface by Dressler et al 3 Figures 10 and 11 show the splash/nonsplash data for elastic liquid jet impaction on smooth and rough surfaces in terms of Deborah and Reynolds numbers. In both graphs, the line separating splash from deposition has a positive slope: 0.13 for the smooth surface and 0.081 for the rough one.…”

Section: Resultssupporting

confidence: 77%

“…1 This liquid is usually applied on the top surface of the rail through sprayers mounted on rail cars, locomotives, or track maintenance vehicles. Spray-coating and polymer impingement cooling are good examples of such industrial applications.…”

Section: Introductionmentioning

confidence: 99%

“…The LFM that has been studied by the authors is a water-based suspension of polymers and inorganic solids showing non-Newtonian behavior. 1 This liquid is usually applied on the top surface of the rail through sprayers mounted on rail cars, locomotives, or track maintenance vehicles. 2 Reduced fuel consumption, reduced rail/wheel wear, and decreased lateral (curving) forces are some of the benefits of LFM utilization.…”

Section: Introductionmentioning

confidence: 99%

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Elastic liquid jet impaction on a high‐speed moving surface

Keshavarz

Green

Eadie³

2012

AIChE Journal

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In the railroad industry a friction‐modifying non‐Newtonian liquid, showing elastic behavior, may be applied to the rail in the form of a liquid jet. The interaction of this elastic liquid jet and the moving surface—specifically whether it splashes or adheres without splash—is important in this industrial application. Twelve different elastic liquids with widely varying relaxation times were tested to isolate the effect of elasticity from other fluid properties. Using high‐speed imaging, the interaction between the impinging jet and the moving surface could be captured and analyzed. Although similar to Newtonian jets, for which the Reynolds number plays a major role, the Deborah number was also salient to the splash of elastic liquids. At the elevated Weber numbers of the testing, the Weber number had a much smaller impact on splash than did the Reynolds or Deborah numbers. The ratio of the surface velocity to the jet velocity has only a small effect on the splash. © 2012 American Institute of Chemical Engineers AIChE J, 2012

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Section: Resultssupporting

confidence: 77%

Section: Resultssupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Elastic liquid jet impaction on a high‐speed moving surface

Keshavarz

Green

Eadie³

2012

AIChE Journal

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“…Based on the techniques of high speed camera and phase Doppler anemometry, experiments provided visualized approaches to reveal the morphology and detailed information of the primary atomization such as breakup length, geometry, spray angle and so on [9]. Dumouchel [10] has reviewed the experimental investigate dedicated to the primary atomization step for Newtonian liquids.…”

Section: Introductionmentioning

confidence: 99%

Numerical Models for Viscoelastic Liquid Atomization Spray

2016

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Atomization spray of non-Newtonian liquid plays a pivotal role in various engineering applications, especially for the energy utilization. To operate spray systems efficiently and well understand the effects of liquid rheological properties on the whole spray process, a comprehensive model using Euler-Lagrangian approaches was established to simulate the evolution of the atomization spray for viscoelastic liquid. Based on the Oldroyd model, the viscoelastic linear dispersion relation was introduced into the primary atomization; an extended viscoelastic version of Taylor analogy breakup (TAB) model was proposed; and the coalescence criteria was modified by rheological parameters, such as the relaxation time, the retardation time and the zero shear viscosity. The predicted results are validated with experimental data varying air-liquid mass flow ratio (ALR). Then, numerical calculations are conducted to investigate the characteristics of viscoelastic liquid atomization process. Results showed that the evolutionary trend of droplet mean diameter, Weber number and Ohnesorge number of viscoelastic liquids along with axial direction were qualitatively similar to that of Newtonian liquid. However, the mean size of polymer solution increased more gently than that of water at the downstream of the spray, which was beneficial to stable control of the desirable size in the applications. As concerned the effects of liquid physical properties, the surface tension played an important role in the primary atomization, which indicated the benefit of selecting the solvents with lower surface tension for finer atomization effects, while, for the evolution of atomization spray, larger relaxation time and zero shear viscosity increased droplet Sauter mean diameter (SMD) significantly. The zero shear viscosity was effective throughout the jet region, while the effect of relaxation time became weaken at the downstream of the spray field.

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