Simulation of mass transfer from an oscillating microdroplet

Guan, Guoqiang; Zhu, Jiahua; Xia, Siqing; Qi, Jianqi; Davis, E. James

doi:10.1016/j.ijheatmasstransfer.2004.11.008

Cited by 10 publications

(7 citation statements)

References 19 publications

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“…Characterizations of bubble oscillation and hydrodynamics are the key factors for understanding the interphase mass transfer. 18 The shape deformation and interface waves of the bubble are the intuitional phenomena during bubble oscillation. The two factors of oscillation amplitude and oscillation frequency are commonly used to quantify the oscillation movement.…”

Section: Introductionmentioning

confidence: 99%

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Microcavity-Enabled Local Oscillation of Taylor Bubbles in a Microchannel

Cheng

Chen

et al. 2021

Ind. Eng. Chem. Res.

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Interphase mass transport is important for many industrial applications ranging from multiphase reaction and separation but remains a great challenge in maximizing the interface area and mass-transfer flux. In this work, a periodical oscillation of Taylor bubbles is demonstrated to enhance interface transport by arranging gas microcavities on the walls of a rectangular microchannel. Bubble oscillation is characterized as the expansion and contraction of the bubble tail near the gas microcavity. Microscope visualization results show that the oscillation amplitude increases with a decrease of cavity width, while it decreases with an increase of capillary number. This is attributed to the increased hydrodynamic resistance in the liquid film between bubble surface and gas microcavity. The evolution of slip velocity at the gas microcavity interface is numerically investigated to explain the interaction between dynamic pressure and Laplace pressure, where bubble velocity fluctuation occurs. A bubble oscillation map is proposed to offer insight into the role of the gas microcavity, providing a quantitative basis to optimize the surface design and operating conditions.

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Section: Introductionmentioning

confidence: 99%

“…Characterizations of bubble oscillation and hydrodynamics are the key factors for understanding the interphase mass transfer . The shape deformation and interface waves of the bubble are the intuitional phenomena during bubble oscillation.…”

Section: Introductionmentioning

confidence: 99%

Microcavity-Enabled Local Oscillation of Taylor Bubbles in a Microchannel

Cheng

Chen

et al. 2021

Ind. Eng. Chem. Res.

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“…Chen , found that the SO 2 absorption by droplets ( R = 200–500 μm) increased with droplet size due the existence of a secondary vortex in the droplets. Guan et al found that mass transfer rate increased with the increased droplet oscillation frequency. Chen et al found that mass transfer from the gas phase into the liquid phase was enhanced when acoustic waves with lower frequencies and higher fluctuated amplitudes were applied to the absorption process.…”

Section: Introductionmentioning

confidence: 99%

Multiple Bounces and Oscillatory Movement of a Microdroplet in Superhydrophobic Minichannels

Hao

Wang

Chen

et al. 2018

Ind. Eng. Chem. Res.

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A droplet jumping intensification device of droplets surrounded by gas has effectively integrated small droplets (d = 0.30–0.60 mm) generated by an electrohydrodynamics system (EHD) and superhydrophobic minichannel to enhance gas absorption or chemical reaction due to the multiple bounces of the droplets. Droplet internal circulation was formed after impact on the superhydrophobic surface in the process of droplet bounce back and forth, with deformation in the superhydrophobic minichannel, which was like a liquid slug moving in the meandering channels. It was shown that the bouncing frequency went up with the decreasing height of the minichannel, meaning that the bouncing movement became stronger in the confined space. The droplet trajectory could be better controlled by the height of the minichannel, droplet size, and impact Weber number, which was investigated experimentally and analytically.

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“…To the best of our knowledge, no study exists in the literature which has investigated evaporation-induced mode transitions in driven oscillations of sessile droplets. There are a few works concerning non-sessile droplets which have looked into both evaporation and oscillations simultaneously. − In sessile droplets, however, combined evaporation and oscillation studies have only focused on the effects of internal flows on particle deposition , and on the shapes of the dried out nanoparticle agglomerate …”

Section: Introductionmentioning

confidence: 99%

How Natural Evaporation Temporally Self-Tunes an Oscillating Sessile Droplet To Resonate at Different Modes

Sanyal

Basu

2016

Langmuir

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We report the dynamics and underlying physics of evaporation driven transitions and autotuning of oscillation modes in sessile droplets subject to substrate perturbations. We have shown that evaporation controls temporal transition of the oscillation mode with a spatially downward shift of nodes (surface locations with zero displacement) toward the three-phase contact line. We have explained the physical mechanism using two parameters: the first quantifies evaporation driven tuning for resonance detection, and the second parameter characterizes mode lifetime which is found to be governed by evaporation dynamics. It is desirable to achieve autotuning of the oscillation modes in sessile droplets that essentially self-evolves in a spatiotemporal manner with continued evaporation. The insights suggest control of mode resonances is possible, which in turn will allow precision manipulations at droplet scale crucial for many applications such as surface patterning and others.

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Simulation of mass transfer from an oscillating microdroplet

Cited by 10 publications

References 19 publications

Microcavity-Enabled Local Oscillation of Taylor Bubbles in a Microchannel

Microcavity-Enabled Local Oscillation of Taylor Bubbles in a Microchannel

Multiple Bounces and Oscillatory Movement of a Microdroplet in Superhydrophobic Minichannels

How Natural Evaporation Temporally Self-Tunes an Oscillating Sessile Droplet To Resonate at Different Modes

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