Bubble shape under the action of electric forces

Marco, Paolo Di; Kurimoto, Ryo; Saccone, Giacomo; Hayashi, Kosuke; Tomiyama, Akio

doi:10.1016/j.expthermflusci.2013.04.015

Cited by 47 publications

(7 citation statements)

References 24 publications

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“…It is important to mention that the built-in codes in commercial simulation software treat the constant angle between the electrode surface and growing bubble as static while it is a dynamic contact angle which requires the user to code a user-defined function. Di Marco et al, 2013 41 studied the effect of electrical force on bubble shape and Zhang et al, 2012 42 found that at a higher cell voltage more fine bubbles detach from the electrode surface. However, further investigation is highly recommended and required to understand the effect of the electrical force, which is caused by electrode charges and the electrode surrounding charges/ions, on the bubbles detachment from the electrode surface.…”

Section: Two Phase Electrochemical Systemsmentioning

confidence: 99%

Review—Physicochemical Hydrodynamics of Gas Bubbles in Two Phase Electrochemical Systems

Taqieddin

Nazari

Rajić

et al. 2017

J. Electrochem. Soc.

117

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Electrochemical systems suffer from poor management of evolving gas bubbles. Improved understanding of bubbles behavior helps to reduce overpotential, save energy and enhance the mass transfer during chemical reactions. This work investigates and reviews the gas bubbles hydrodynamics, behavior, and management in electrochemical cells. Although the rate of bubble growth over the electrode surface is well understood, there is no reliable prediction of bubbles break-off diameter from the electrode surface because of the complexity of bubbles motion near the electrode surface. Particle Image Velocimetry (PIV) and Laser Doppler Anemometry (LDA) are the most common experimental techniques to measure bubble dynamics. Although the PIV is faster than LDA, both techniques are considered expensive and time-consuming. This encourages adapting Computational Fluid Dynamics (CFD) methods as an alternative to study bubbles behavior. However, further development of CFD methods is required to include coalescence and break-up of bubbles for better understanding and accuracy. The disadvantages of CFD methods can be overcome by using hybrid methods. The behavior of bubbles in electrochemical systems is still a complex challenging topic which requires a better understanding of the gas bubbles hydrodynamics and their interactions with the electrode surface and bulk liquid, as well as between the bubbles itself.

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Section: Two Phase Electrochemical Systemsmentioning

confidence: 99%

Review—Physicochemical Hydrodynamics of Gas Bubbles in Two Phase Electrochemical Systems

Taqieddin

Nazari

Rajić

et al. 2017

J. Electrochem. Soc.

117

View full text Add to dashboard Cite

show abstract

“…Since electric fields are widely used to enhance boiling heat transfer, 18 , 21 – 24 the cuvette was equipped with electrodes to investigate the field effects on single-bubble boiling. Conventional electric techniques are limited to low conducting liquids because of using bare electrodes inserted into the liquid.…”

Section: Resultsmentioning

confidence: 99%

Single-bubble water boiling on small heater under Earth’s and low gravity

et al. 2018

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Today’s trends for enhancing boiling heat transfer in terrestrial and space applications focus on removal of bubbles to prevent formation of a vapor layer over the surface at high overheat. In contrast, this paper presents a new boiling regime that employs a vapor–air bubble residing on a small heater for minutes and driving cold water over the surface to provide high heat flux. Single-bubble boiling of water was investigated under normal gravity and low gravity in parabolic flights. Experiments demonstrated a negligible effect of gravity level on the rate of heat transfer from the heater. Due to self-adjustment of the bubble size, the heat flux provided by boiling rose linearly up with increasing heater temperature and was not affected by a gradually rising water temperature. The fast response and stable operation of single-bubble boiling over a broad range of temperatures pave the way for development of new devices to control heat transfer by forming surface domains with distinct thermal properties and wettability. The bubble lifetime can be adjusted by changing the water temperature. The ability of heating water on millimeter scales far above 100 °C without an autoclave or a powerful laser provides a new approach for processing of biomaterials and chemical reactions.

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“…Seeing that the change of geometry of the interface alters the electric field distribution, the electric field and the hydrodynamic equations are coupled. The related researches are conducted in [15][16][17]. In the comprehensive numerical simulations, the Laplace equations for the electric field coupled with the Navier-Stokes equations for fluid flow are solved to simulate the motion, deformation, rising and/or break-up of an initially spherical bubble in a quiescent viscous fluid.…”

Section: Introductionmentioning

confidence: 99%