scispace - formally typeset
Search or ask a question
Topic

Marangoni effect

About: Marangoni effect is a research topic. Over the lifetime, 5336 publications have been published within this topic receiving 98562 citations. The topic is also known as: Gibbs–Marangoni effect.


Papers
More filters
Journal ArticleDOI
TL;DR: This work demonstrates an integrated liquid cooling system by utilizing a small droplet of liquid metal Galinstan, which is placed over the hot spot, and facilitates the rapid cooling of localized hot spots.
Abstract: The continued miniaturization of electronic components demands integrated liquid cooling systems with minimized external connections and fabrication costs that can be implanted very close to localized hot spots. This might be challenging for existing liquid cooling systems because most of them rely on external pumps, connecting tubes, and microfabricated heat sinks. Here, we demonstrate an integrated liquid cooling system by utilizing a small droplet of liquid metal Galinstan, which is placed over the hot spot. Energizing the liquid metal droplet with a square wave signal creates a surface tension gradient across the droplet, which induces Marangoni flow over the surface of droplet. This produces a high flow rate of coolant medium through the cooling channel, enabling a “soft” pump. At the same time, the high thermal conductivity of liquid metal extends the heat transfer surface and facilitates the dissipation of heat, enabling a “soft” heat sink. This facilitates the rapid cooling of localized hot spots,...

92 citations

Journal ArticleDOI
TL;DR: In this paper, the complex physicochemical phenomena occurring in the contact line region of an evaporating meniscus are described using a unique combination of high-resolution experimental data and three complementary models.

92 citations

Journal ArticleDOI
01 Feb 2013-EPL
TL;DR: In this paper, an active microswimmer was constructed where a micron-sized droplet of bromine water was placed into a surfactant-laden oil phase.
Abstract: Recently, an active microswimmer was constructed where a micron-sized droplet of bromine water was placed into a surfactant-laden oil phase. Due to a bromination reaction of the surfactant at the interface, the surface tension locally increases and becomes non-uniform. This drives a Marangoni flow which propels the squirming droplet forward. We develop a diffusion-advection-reaction equation for the order parameter of the surfactant mixture at the droplet interface using a mixing free energy. Numerical solutions reveal a stable swimming regime above a critical Marangoni number M but also stopping and oscillating states when M is increased further. The swimming droplet is identified as a pusher whereas in the oscillating state it oscillates between being a puller and a pusher.

92 citations

Journal ArticleDOI
TL;DR: An experimental study of transient drop rise velocities and mass transfer rates was carried out in the system toluene/acetone/water which is known to show interfacial instabilities as mentioned in this paper.

92 citations

Journal ArticleDOI
TL;DR: In this article, the authors describe how Marangoni flows of various forms can be generated in thin liquid films for the purposes of microfluidic manipulation, including traps, channels, filters and pumps.
Abstract: This paper describes how Marangoni flows of various forms can be generated in thin liquid films for the purposes of microfluidic manipulation. Several microfluidic components, including traps, channels, filters and pumps, for manipulating aqueous droplets suspended in a film of oil on blank, unpatterned substrates are demonstrated. These are ‘virtual’ devices because they have no physical structure; they accomplish their function entirely by localized variations in surface tension (Marangoni flows) created in a non-contact manner by heat sources suspended just above the liquid surface. Various flow patterns can be engineered through the geometric design of the heat sources on size scales ranging from 10 to 1000 μm. A point source generates toroidal flows which can be used for droplet merging and mixing. Virtual channels and traps, emulated by linear and annular heat fluxes, respectively, demonstrate nearly 100% size selectivity for droplets ranging from 300 to 1000 μm. A source of heat flux that is parallel to the surface and is triangular with a 10 ◦ taper serves as a linear pump, translating droplets of about the same size at speeds up to 200 μ ms −1 . The paper includes simulations that illuminate the working principle of the devices. Models show that Marangoni flows scale favorably to small length scales. By using microscale thermal devices delivering sharp temperature gradients, it is possible to generate mm s −1 flow velocities with only small increases (<1 ◦ ) in liquid temperature. (Some figures in this article are in colour only in the electronic version)

91 citations


Network Information
Related Topics (5)
Reynolds number
68.4K papers, 1.6M citations
88% related
Heat transfer
181.7K papers, 2.9M citations
84% related
Turbulence
112.1K papers, 2.7M citations
81% related
Nucleation
63.8K papers, 1.6M citations
80% related
Thermal conductivity
72.4K papers, 1.4M citations
79% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023212
2022421
2021289
2020283
2019217
2018247