Air entrapment and bubble formation during droplet impact onto a single cubic pillar

Ren, Weibo; Foltyn, Patrick; Geppert, A.

doi:10.1038/s41598-021-97376-3

Cited by 11 publications

(3 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The continuum surface force (CSF) model [17] is used for surface tension, and for the interface reconstruction the Piecewise Linear Interface Calculation (PLIC) method is used [20]. FS3D has been applied successfully to various multiphase flow problems like droplet impacts onto structured surfaces [21], evaporating droplets [22], thermocapillary flows [23] and drop-film interactions [24].…”

Section: Simulation Tool: Free Surface 3dmentioning

confidence: 99%

Numerical simulation of droplet impact onto heated surfaces below the boiling point

Saha,

Weigand

2024

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

Droplet impact onto heated surfaces is a widespread process in industrial applications, particularly in the context of spray cooling techniques. Therefore, it is essential to study the complex phenomenon of droplet spreading, heat removal and flow distributions during this process. The primary focus of this research centers on the wetting dynamics at a surface temperature below the saturation temperature of the liquid. This study employs a Computational fluid dynamics (CFD) framework to simulate the impact dynamics of a water droplet onto a heated surface. The impact dynamics, spreading, air entrapment and heat transfer in the process are discussed using simulation results. The Direct Numerical Simulation (DNS) tool Free Surface 3D (FS3D), an in-house code at the Institute of Aerospace Thermodynamics, University of Stuttgart, is utilized. The Finite-Volume method is used to solve the incompressible Navier-Stokes equations, and the interface is defined by the Volume of fluid (VOF) method. In this study, the temperature change above the entrapped air bubble formed due to droplet inertia is shown, which can influence the heat removal rate in the process. Therefore, conducting a comprehensive study on the temperature shift caused by the air bubble is crucial.

show abstract

Section: Simulation Tool: Free Surface 3dmentioning

confidence: 99%

Numerical simulation of droplet impact onto heated surfaces below the boiling point

Saha,

Weigand

2024

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

“…Therefore, the reacted concentrations of the solvent molecules in the droplets are uncertain and can change depending on the external environment. In general, solvent electrolysis in a droplet cannot fully proceed because of a high concentration of solvent molecules, a loss of electrical contact during electrolysis, or bubble formation [ 32 , 33 , 34 ]. With an uncertain concentration of the redox species (i.e., solvent molecule) reacting in the droplet, the size of the droplet could not be estimated.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Analysis of Attoliter Water Droplets in Organic Solutions through Partitioning Equilibrium

Moon

Park

2023

Sensors

View full text Add to dashboard Cite

Herein, we report the electrochemical monitoring of attoliters of water droplets in an organic medium by the electrolysis of an extracted redox species from the continuous phase upon collisional events on an ultramicroelectrode. To obtain information about a redox-free water droplet in an organic solvent, redox species with certain concentrations need to be contained inside it. The redox species inside the droplet were delivered by a partitioning equilibrium between the organic phase and the water droplets. The mass transfer of the redox species from the surrounding organic phase to the droplet is very fast because of the radial diffusion, which resultantly establishes the equilibrium. Upon the collisional contact between the droplet and the electrode, the extracted redox species in the water droplets were selectively electrolyzed, even though the redox species in the organic continuous phase remained unreacted because of the different solvent environments. The electrolysis of the redox species in the droplets, where the concentration is determined by the equilibrium constant of the redox species in water/oil, can be used to estimate the size of single water droplets in an organic solution.

show abstract

“…The phenomenon of droplet impact widely exists in nature, [ 1 ] industrial processes, [ 2 ] and even human daily lives. [ 3 ] In particular, droplet impacts are imperative to industrial processes employing spray coating and painting, [ 4 ] spray cooling, [ 5 ] inkjet printing, [ 6 ] combustion engines, [ 7 ] and anti‐icing characteristics of critical industrial components such as aircraft surface, powder lines, and wind turbines.…”

Section: Introductionmentioning

confidence: 99%

A Periodic Wetting Surface Driven by Triboelectric Nanogenerator for Efficient Postimpact Droplet Collection

Tan

Fan

Sun

et al. 2022

Adv Materials Inter

View full text Add to dashboard Cite

The phenomenon of droplet impact is widely observed in nature and industrial processes. No matter the intrinsic wettability (hydrophobic, hydrophilic, and superhydrophobic) of the surface, the postimpact droplets tend to rebound or splash. The droplet impact dynamics have been well investigated but the inhibition of the rebounding or splashing of the postimpact droplet requires further exploration. This paper proposes a periodic wetting surface (PWS) driven by a triboelectric nanogenerator (TENG) for efficient postimpact droplet collection. With the high‐voltage electric signal generated from a rotating freestanding triboelectric nanogenerator (RF‐TENG), the wettability of an interdigital electrodes‐based electrowetting‐on‐dielectric (EWOD) surface can be changed periodically. The droplet impacts on the PWS show oscillating sliding motion that compensates the kinetic energy for droplet rebounding or splashing. As compared to pure hydrophobic or hydrophilic surfaces, the PWS shows the best droplet collection performance. The effects of the electric signal of the RF‐TENG such as open‐circuit voltage (0.44–3.00 kV) and frequency (0–60 Hz), droplet contents such as ions type and concentration of the droplet on the postimpact droplet collection efficiency are discussed. Finally, a practical application is demonstrated by the TENG driven PWS for real‐time and high‐efficiency collection of multiple postimpact droplets.

show abstract

Air entrapment and bubble formation during droplet impact onto a single cubic pillar

Cited by 11 publications

References 63 publications

Numerical simulation of droplet impact onto heated surfaces below the boiling point

Numerical simulation of droplet impact onto heated surfaces below the boiling point

Electrochemical Analysis of Attoliter Water Droplets in Organic Solutions through Partitioning Equilibrium

A Periodic Wetting Surface Driven by Triboelectric Nanogenerator for Efficient Postimpact Droplet Collection

Contact Info

Product

Resources

About