Sheet Atomization of Non-Newtonian Liquids

Hartranft, Thomas J.; Settles, Gary S.

doi:10.1615/atomizspr.v13.i23.30

Cited by 7 publications

(8 citation statements)

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“…Droplet evaporation represents a common natural phenomenon that has applications in numerous industrial fields: DNA mapping, ink-jet printing, surface patterning and evaporative spray cooling among others [2][3][4][5][6][7][8][9][10][11][12][13][14]. Heat and mass transfer to the contact line region of an evaporating droplet is a classical heat and mass transfer problem that is not yet fully solved.…”

Section: Introductionmentioning

confidence: 99%

Heat flux distribution beneath evaporating hydrophilic and superhydrophobic droplets

Gibbons

Marco

Robinson

2020

International Journal of Heat and Mass Transfer

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An experimental investigation of the heat and mass transfer to an evaporating hydrophilic water droplet using thin-foil thermography and droplet shape analysis is reported. These results have been compared with that of a superhydrophobic evaporating droplet. The hydrophilic droplet initially evaporated with a pinned contact line before unpinning and evaporating with a receding contact line. The largest heat flux is observed at the contact line region for both droplets. The hydrophilic droplet evaporated 34% faster than its superhydrophobic counterpart due to its greater contact line length, liquid-gas interface temperature and solid-liquid surface area for the majority of its evaporation. In general, the hydrophilic droplet dissipated a greater total power due to its larger contact line length and solid-liquid surface area, while the superhydrophobic droplet had a greater average heat flux due to its larger contact line length density for the majority of its evaporation time. The average heat flux to the evaporating droplets was demonstrated to vary as a linear function of the contact line length density.

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Section: Introductionmentioning

confidence: 99%

Heat flux distribution beneath evaporating hydrophilic and superhydrophobic droplets

Gibbons

Marco

Robinson

2020

International Journal of Heat and Mass Transfer

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“…A fundamental process like droplet evaporation which is widely observed in day to day life holds a pivotal role in many technical applications, including DNA/RNA micro-array deposition [1,2], inkjet printing [3,4], microelectronics cooling [5][6][7], combustion [8,9] and metrology [10][11][12]. In such technologies, the evaporation rate is a key contributor to the overall system efficiency -as it dictates the droplet lifetime and corresponding rates of heat and mass transfer.…”

Section: Introductionmentioning

confidence: 99%

Steady-state droplet evaporation: Contact angle influence on the evaporation efficiency

Gleason

Voota

2016

International Journal of Heat and Mass Transfer

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“…For non-Newtonian spray, the effects of viscoelasticity on the droplets evolution and distribution in the downstream field have attracted numerous industrial applications [23,24]. For different applications, the requirements of droplet size and distribution are different, for instance, finer droplets are desirable for combustions and painting spray [25]. On the contrary, in pesticide sprays [26] and anti-misting jet, too small drops are undesirable.…”

Section: Introductionmentioning

confidence: 99%

“…Ma et al [29] found the particle size distribution was fit to the Rosin-Rammler function through 3-D phase Doppler methods. Hartranft and Settles [25] indicated that extensional viscosity had the dominant influence on sheet breakup features compared to Weber number, which means the traditional Weber number may not qualify to describe the breakup of non-Newtonian fluids. These experimental investigations can support us to extend the breakup mode of Newtonian drop to the viscoelastic version.…”

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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Sheet Atomization of Non-Newtonian Liquids

Cited by 7 publications

References 0 publications

Heat flux distribution beneath evaporating hydrophilic and superhydrophobic droplets

Heat flux distribution beneath evaporating hydrophilic and superhydrophobic droplets

Steady-state droplet evaporation: Contact angle influence on the evaporation efficiency

Numerical Models for Viscoelastic Liquid Atomization Spray

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