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Research Papers: Flows in Complex Systems

Gas-Assisted Droplet Impact on a Solid Surface

[+] Author and Article Information
Andres J. Diaz

Escuela de Ingenieria Industrial,
Facultad de Ingenieria,
Universidad Diego Portales,
Av. Ejercito 441, Santiago Centro, Chile
e-mail: andres.diaz@udp.cl

Alfonso Ortega

Mechanical Engineering Department,
College of Engineering,
Villanova University,
800 E. Lancaster Avenue,
Villanova, PA 19085
e-mail: alfonso.ortega@villanova.edu

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received May 28, 2015; final manuscript received February 18, 2016; published online May 19, 2016. Assoc. Editor: Oleg Schilling.

J. Fluids Eng 138(8), 081104 (May 19, 2016) (9 pages) Paper No: FE-15-1362; doi: 10.1115/1.4033025 History: Received May 28, 2015; Revised February 18, 2016

An experimental, numerical, and theoretical investigation of the behavior of a gas-assisted liquid droplet impacting on a solid surface is presented with the aim of determining the effects of a carrier gas on the droplet deformation dynamics. Experimentally, droplets were generated within a circular air jet for gas Reynolds numbers Reg = 0–2547. High-speed photography was used to capture the droplet deformation process, whereas the numerical analysis was conducted using the volume of fluid (VOF) model. The numerical and theoretical predictions showed that the contribution of a carrier gas to the droplet spreading becomes significant only at high Weo and when the work done by pressure forces is greater than 10% of the kinetic energy. Theoretical predictions of the maximum spreading diameter agree reasonably well with the experimental and numerical observations.

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Figures

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Fig. 1

Schematic of the experimental apparatus

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Fig. 2

Computational domain and boundary conditions

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Fig. 3

Droplet schematic: (a) before the impact and (b) at maximum spreading

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Fig. 4

Images of the entire deformation process of a gas-assisted droplet

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Fig. 5

Experimental spreading rate of a gas-assisted droplet as a function of nondimensional time

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Fig. 6

Side-by-side comparison of the experimental and numerical images obtained during the spreading process of a gas-assisted droplet

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Fig. 7

Spreading rate comparison of a gas-assisted droplet as a function of nondimensional time

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Fig. 8

Numerical spreading rate of a gas-assisted droplet as a function of Ω and for (a) Weo = 30, (b) 50, and (c) 100

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Fig. 9

Numerical and theoretical comparison of the gas contribution as a function of both Ω and Weo (symbols correspond to numerical data)

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