Evaporation excites temporal sequence of resonant modes in a sessile droplet perturbed at constant frequency – Insights into the universal dynamics of mode transitions

Sanyal, Apratim; Basu, Saptarshi

doi:10.1016/j.ces.2017.10.053

Cited by 3 publications

(7 citation statements)

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“…Considering diffusion-driven evaporation, an expression for the mode lifetime was obtained where C s and C ∞ are the saturation vapor concentration near the interface and the ambient vapor concentration at the monitored temperatures, respectively, and ψ(θ c ) is a function of θ c . In eq , the mode lifetimes increase with n , which is also seen in Figure c; i.e., higher-order modes have higher survival spans . Again, a particular mode n is seen to last for shorter lifetimes τ n for higher excitation frequencies.…”

Section: Effect Of External Stimulisupporting

confidence: 57%

“…The static contact angle θ c in such a dynamic case is the equilibrium contact angle of the unperturbed droplet. In the experimental space studied by Sanyal and Basu, 60,64 the evaporation rate of an oscillating sessile droplet was found to be comparable to that of a stationary sessile one. As mentioned previously, the effect of interface oscillations on evaporation flux could not be isolated and thus kept out of the discussion.…”

Section: Demonstrated Experimentally Thatmentioning

confidence: 84%

“…In eq 4, the mode lifetimes increase with n, which is also seen in Figure 7c; i.e., higher-order modes have higher survival spans. 64 Again, a particular mode n is seen to last for shorter lifetimes τ n for higher excitation frequencies. Since f remains constant in a droplet evaporation lifespan, the negative 4/3 power law dependence of τ n on f for all excitation frequencies (i.e., drop evaporation at different frequencies) is purely evaporation-driven.…”

Section: Demonstrated Experimentally Thatmentioning

confidence: 90%

“…Since f remains constant in a droplet evaporation lifespan, the negative 4/3 power law dependence of τ n on f for all excitation frequencies (i.e., drop evaporation at different frequencies) is purely evaporation-driven. 64 The mode lifetime is alternatively seen as a transition regime between two sequential mode resonances. Consequently, important dynamics arise pertaining to such a transition.…”

Section: Demonstrated Experimentally Thatmentioning

confidence: 99%

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Engineering Interfacial Processes at Mini-Micro-Nano Scales Using Sessile Droplet Architecture

et al. 2018

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Evaporating sessile functional droplets act as the fundamental building block that controls the cumulative outcome of many industrial and biological applications such as surface patterning, 3D printing, photonic crystals, and DNA sequencing, to name a few. Additionally, a drying single sessile droplet forms a high-throughput processing technique using low material volume which is especially suitable for medical diagnosis. A sessile droplet also provides an elementary platform to study and analyze fundamental interfacial processes at various length scales ranging from macroscopically observable wetting and evaporation to microfluidic transport to interparticle forces operating at a nanometric length scale. As an example, to ascertain the quality of 3D printing we must understand the fundamental interfacial processes at the droplet scale. In this article, we review the coupled physics of evaporation flow-contact-line-driven particle transport in sessile colloidal droplets and provide methodologies to control the same. Through natural alterations in droplet vaporization, one can change the evaporative pattern and contact line dynamics leading to internal flow which will modulate the final particle assembly in a nontrivial fashion. We further show that control over particle transport can also be exerted by external stimuli which can be thermal, mechanical oscillations, vapor confinement (walled or a fellow droplet), or chemical (surfactant-induced) in nature. For example, significant augmentation of an otherwise evaporation-driven particle transport in sessile droplets can be brought about simply through controlled interfacial oscillations. The ability to control the final morphologies by manipulating the governing interfacial mechanisms in the precursor stages of droplet drying makes it perfectly suitable for fabrication-, mixing-, and diagnostic-based applications.

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Section: Effect Of External Stimulisupporting

confidence: 57%

Section: Demonstrated Experimentally Thatmentioning

confidence: 84%

Section: Demonstrated Experimentally Thatmentioning

confidence: 90%

Section: Demonstrated Experimentally Thatmentioning

confidence: 99%

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Engineering Interfacial Processes at Mini-Micro-Nano Scales Using Sessile Droplet Architecture

et al. 2018

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“…Theoretical studies of the process of liquid jet decay into droplets under the action of its own oscillations [6] is the first, major step of theoretical and experimental studies to develop reliable mathematical models and to create calculation techniques for designing prillers. These models should spray the liquid into prills [7] with subsequent crystallization [8].…”

Section: Introductionmentioning

confidence: 99%

Effect of Superimposed Vibrations on Droplet Oscillation Modes in Prilling Process

et al. 2020

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This article was aimed to solve an urgent problem of ensuring quality for prilling processes in vibrational prilling equipment. During the research, the need for the application of vibrational prilling to create a controlled impact on the process of jet decay on droplets with the proper characteristics was substantiated. Based on the experimental and theoretical studies of the process of decay of a liquid jet into drops, axisymmetric droplet oscillation modes for the different frequencies were observed. Frequency ranges of transition between modes of decay of a jet into drops were obtained. As a result, the mathematical model of the droplet deformation was refined. The experimental research data substantiated this model, and its implementation allowed determining the analytical dependencies for the components of the droplet deformation velocity. The proposed model explains the existence of different droplet oscillation modes depending on the frequency characteristics of the superimposed vibrational impact. Based on an analytical study of the droplet deformation velocity components, the limit values of the characteristics defining the transition between the different droplet oscillation modes were discovered. Analytical dependencies were also obtained to determine the diameter of the satellites and their total number.

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Computational and experimental investigations on the evaporation of single and multiple elongated droplets

Aboubakri¹,

Akkuş²,

Sadaghiani³

et al. 2022

Chemical Engineering Journal Advances

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Evaporation excites temporal sequence of resonant modes in a sessile droplet perturbed at constant frequency – Insights into the universal dynamics of mode transitions

Cited by 3 publications

References 50 publications

Engineering Interfacial Processes at Mini-Micro-Nano Scales Using Sessile Droplet Architecture

Engineering Interfacial Processes at Mini-Micro-Nano Scales Using Sessile Droplet Architecture

Effect of Superimposed Vibrations on Droplet Oscillation Modes in Prilling Process

Computational and experimental investigations on the evaporation of single and multiple elongated droplets

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