Bridging‐Droplet Thermal Diodes

Edalatpour, Mojtaba; Murphy, Kevin R.; Mukherjee, Ranit; Boreyko, Jonathan B.

doi:10.1002/adfm.202004451

Cited by 30 publications

(26 citation statements)

References 40 publications

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“…Edalatpour et al developed a planar bridging-droplet thermal diode that was orientation-independent on the basis of the phenomenon of droplet coalescence jumping and achieved a heat-transfer ratio of as high as 85. 100 Electrostatic Energy Collection. It has become a common practice to obtain all kinds of energy from the environment and convert it into electrical energy for use, especially for the application of low-power wireless devices.…”

Section: ■ Applicationsmentioning

confidence: 99%

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Coalescence-Induced Droplet Jumping

et al. 2021

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When two or more droplets coalesce on a superhydrophobic surface, the merged droplet can jump spontaneously from the surface without requiring any external energy. This phenomenon is defined as coalescence-induced droplet jumping and has received significant attention due to its potential applications in a variety of self-cleaning, anti-icing, antifrosting, and condensation heat-transfer enhancement uses. This article reviews the research and applications of coalescence-induced droplet jumping behavior in recent years, including the influence of droplet parameters on coalescence-induced droplet jumping, such as the droplet size, number, and initial velocity, to name a few. The main structure types and influence mechanism of the superhydrophobic substrates for coalescence-induced droplet jumping are described, and the potential application areas of coalescence-induced droplet jumping are summarized and forecasted.

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Section: ■ Applicationsmentioning

confidence: 99%

“…Vapor–liquid phase heat transfer is an efficient energy transmission method that is widely dispersed in daily industrial processes. − …”

Section: Applicationsmentioning

confidence: 99%

Coalescence-Induced Droplet Jumping

et al. 2021

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“…From Refs. [218,219], we can see phase changes can also be introduced in convective systems to design nonlinear elements, such as vaporation/condensation [220,221] and melting/solidification [222]. Any way, the basic working principle is still looking for different thermal conductance in different modes and the conductance should be somewhat temperature-related, whether the relationship is apparent or implicit in the direction of convection and various types of thermally-induced phase changes.…”

Section: Convectionmentioning

confidence: 99%

Designing nonlinear thermal devices and metamaterials under the Fourier law: A route to nonlinear thermotics

Dai

2021

Front. Phys.

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Nonlinear heat transfer can be exploited to reveal novel transport phenomena and thus enhance people's ability to manipulate heat flux at will. However, there hasn't been a mature discipline called nonlinear thermotics like its counterpart in optics or acoustics to make a systematic summary of relevant researches. In the current review, we focus on recent progress in an important part of nonlinear heat transfer, i.e., tailoring nonlinear thermal devices and metamaterials under the Fourier's law, especially with temperature-dependent thermal conductivities. We will present the basic designing techniques including solving the equation directly and the transformation theory. Tuning nonlinearity coming from multi-physical effects, and how to calculate effective properties of nonlinear conductive composites using the effective medium theory are also included. Based on these theories, researchers have successfully designed various functional materials and devices such as the thermal diodes, thermal transistors, thermal memory elements, energy-free thermostats, and intelligent thermal materials, and some of them have also been realized in experiments. Further, these phenomenological works can provide a feasible route for the development of nonlinear thermotics.

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“…In industry, condensation is critical in multiple applications such as power generation, [ 1 ] water desalination, [ 2 ] and dew water harvesting [ 3,4 ] and thermal management. [ 5 ] Tuning and predicting the outcome of condensation is challenging because of the interplay of several processes. It is well established that condensation of a fluid on rigid substrates proceeds in four distinct steps – formation of initial condensate nuclei, growth of individual droplets through direct condensation, droplet coalescence, and eventual removal of the condensate from the surface.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Condensation on Soft Materials through Bulk Lubricant Infusion

Sharma

Milionis

Naga

et al. 2021

Adv Funct Materials

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Soft substrates enhance droplet nucleation during water vapor condensation because their deformability inherently reduces the energetic threshold for heterogeneous nucleation relative to rigid substrates. However, this enhancement is counteracted later in the condensation cycle, when substrate viscoelastic dissipation inhibits condensate droplet shedding. Here a polydimethylsiloxane (PDMS) based organogel is designed to overcome this limitation. It is shown that merely 5% bulk lubricant infusion in PDMS reduces viscoelastic dissipation in the substrate by nearly 28 times while doubling the droplet nucleation density. Parameters for water condensation on this organogel are correlated with material properties controlled by design, i.e., fraction and composition of uncrosslinked chains and shear modulus. It is demonstrated that the increase in nucleation density and reduction in precoalescence droplet growth rate is rather insensitive to the lubricant percentage in PDMS within the broad range investigated. These results indicate the presence of a lubricant layer on the substrate surface that cloaks the growing condensate droplets. This cloaking effect is visualized, and it is shown that cloaking occurs significantly faster on PDMS if it is infused with bulk lubricant. Overall, bulk lubricant infusion in PDMS enhances condensation and leads to a more than 40% higher dewing on the substrate.

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Bridging‐Droplet Thermal Diodes

Cited by 30 publications

References 40 publications

Coalescence-Induced Droplet Jumping

Coalescence-Induced Droplet Jumping

Designing nonlinear thermal devices and metamaterials under the Fourier law: A route to nonlinear thermotics

Enhanced Condensation on Soft Materials through Bulk Lubricant Infusion

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