Numerical Simulation of Evaporating Two-Phase Flow in a High-Aspect-Ratio Microchannel with Bends

Girard, Adam; You, Seungkwon; Garimella, Suresh V.

doi:10.1115/1.4036879

Cited by 5 publications

(4 citation statements)

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“…Here: C v is the effective specific heat, is the airflow velocity, and D f is the diffusion coefficient (m 2 s −1 ). In addition, the mass out-flux at the droplet interface is given by 21 , 22 : where: is the interfacial velocity, is the outward unit vector at the interface, the vapor phase is designated by v , and the liquid phase is by f .…”

Section: Numerical Modelingmentioning

confidence: 99%

Dust mitigation by a water droplet in between movable and modified wetting states surfaces

Hassan,

Abubakar,

Sami Yilbas

et al. 2023

Sci Rep

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A novel approach for mitigating environmental dust from hydrophobic surfaces using a water droplet is presented. A sessile droplet is sandwiched between two parallel plates, one of which is moveable and hydrophilic while the other is stationary and hydrophobic. Investigations are conducted into how plate spacing affects the dust mitigation rate and the droplet's level motion. The high-speed camera analyzes the droplet motion for various plate spacing, dusty regions, and droplet sizes. In a controlled laboratory setting, the movement of fluid and dust particles inside a droplet is simulated. The results showed that when a droplet is still, it effectively reduces dust. The droplet meniscus expands by decreasing the gap between the droplet and the surface, increasing the dust removal rate. While the Magdeburg force and surface tension influence the droplet's adhesion to a hydrophobic surface, surface tension remains the primary factor affecting droplet pinning on a hydrophilic plate, more so than pinning on a dusty hydrophobic surface. When compressing, a current is created in the droplet fluid, greatly accelerating the rate at which dust is removed from the hydrophobic surface. We also move a dangling droplet over a dirty surface to evaluate its cleaning effectiveness and find that a 60 µL droplet has a 97% cleaning effectiveness and can remove dust from up to 450 mm2 of surface area. Our study provides insight into the unique method of removing dust from active surfaces and sheds light on droplet pinning forces generated by the Magdeburg effect in nano-cavities during vertical and horizontal movement.

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Section: Numerical Modelingmentioning

confidence: 99%

Dust mitigation by a water droplet in between movable and modified wetting states surfaces

Hassan,

Abubakar,

Sami Yilbas

et al. 2023

Sci Rep

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“…Droplet surface evaporation into the air ambient can be included via utilizing diffusion-convection analogy, which can be written as 22 : Here: C v is the specific heat at constant volume, being airflow velocity, and D v is diffusion coefficient (m 2 s −1 ). The interfacial mass-flux at droplet fluid and air contact surface can be obtained through the adoption of the mass-conservation terms, which are 23 , 24 : Here: represents interfacial velocity, is outward unit vector being normal to droplet fluid-air interface, vapor phase is specified by v and liquid phase is by l . Therefore, change of velocity across the interface can be written as 24 : …”

Section: Numerical and Validation Studymentioning

confidence: 99%

On the mechanism of droplet rolling and spinning in inclined hydrophobic plates in wedge with different wetting states

Yilbaş

Yakubu

Abubakar

et al. 2021

Sci Rep

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A water droplet rolling and spinning in an inclined hydrophobic wedge with different wetting states of wedge plates is examined pertinent to self-cleaning applications. The droplet motion in the hydrophobic wedge is simulated in 3D space incorporating the experimental data. A high-speed recording system is used to store the motion of droplets in 3D space and a tracker program is utilized to quantify the recorded data in terms of droplet translational, rotational, spinning, and slipping velocities. The predictions of flow velocity in the droplet fluid are compared with those of experimental results. The findings revealed that velocity predictions agree with those of the experimental results. Tangential momentum generated, via droplet adhesion along the three-phase contact line on the hydrophobic plate surfaces, creates the spinning motion on the rolling droplet in the wedge. The flow field generated in the droplet fluid is considerably influenced by the shear rate created at the interface between the droplet fluid and hydrophobic plate surfaces. Besides, droplet wobbling under the influence of gravity contributes to the flow inside the rolling and spinning droplet. The parallel-sided droplet path is resulted for droplet emerging from the wedge over the dusty surface.

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“…The mass flux because of phase change at the interface boundary can be assessed using mass conservation at the droplet interface (droplet liquid–gas) , here, υ̅ is the velocity at the interface and being normal to the surface of liquid phase and n̅ is the unit vector, which points outward from the interface of liquid–gas (water–air), and g (subscripts) represents the gas phase. Hence, interfacial velocity jump ( u̅ – u ̅ g ) is …”

Section: Numerical Modelingmentioning

confidence: 99%

“…The mass flux because of phase change at the interface boundary can be assessed using mass conservation at the droplet interface (droplet liquid−gas) 36,37 ρ υ…”

mentioning

confidence: 99%

Carbonated Water Droplet Can Ease Dust Mitigation from Hydrophobic Surfaces

et al. 2020

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Carbonated water droplets can ease the difficulties faced by distilled water droplets mitigating dust particles from hydrophobic surfaces. Rising of CO2 bubbles in carbonated water droplets and their interaction with the flow structure, created by Marangoni and buoyancy possessions, in droplets are investigated. Spreading and infusion (cloaking) of carbonated water on dust surfaces are analyzed, and the rate at which bubbles formed inside the carbonated water droplet, as placed on a dusty hydrophobic surface, is examined. Flow structures formed inside the carbonated water droplet are simulated, and findings are compared to those corresponding to the distilled water droplet. Dust mitigation from the hydrophobic surface toward droplet liquid inside is evaluated using the high-speed recording system, and the results are compared with those of predictions. It is found that carbonated water spreads and infuses onto dust particles at a higher rate than that at which distilled water does. The rising bubble generates wake-like flow in the fluid while modifying the flow structure inside the droplet; hence, the number of circulating structures increases from two to four in droplet fluid. The dust particles picked up by flow currents are redistributed over the entire carbonated water droplet, while mitigated dust particles remain in the lower region of the distilled water droplet. Bubbles formed inside the carbonated water droplet improve dust lifting and rate of dust mitigation from the surface.

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Numerical Simulation of Evaporating Two-Phase Flow in a High-Aspect-Ratio Microchannel with Bends

Cited by 5 publications

References 0 publications

Dust mitigation by a water droplet in between movable and modified wetting states surfaces

Dust mitigation by a water droplet in between movable and modified wetting states surfaces

On the mechanism of droplet rolling and spinning in inclined hydrophobic plates in wedge with different wetting states

Carbonated Water Droplet Can Ease Dust Mitigation from Hydrophobic Surfaces

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