Droplet evaporation dynamics on microstructured biphilic, hydrophobic, and smooth surfaces

2021 ◽  
Vol 62 (7) ◽  
Author(s):  
A. Alperen Günay ◽  
Moon-Kyung Kim ◽  
Xiao Yan ◽  
Nenad Miljkovic ◽  
Soumyadip Sett
Keyword(s):  
Droplet Evaporation ◽  
Smooth Surfaces ◽  
Evaporation Dynamics

Droplet Evaporation Dynamics on a Superhydrophobic Surface with Negligible Hysteresis

Langmuir ◽  
2013 ◽  
Vol 29 (34) ◽  
pp. 10785-10795 ◽  
Author(s):  
Susmita Dash ◽  
Suresh V. Garimella
Keyword(s):  
Superhydrophobic Surface ◽  
Droplet Evaporation ◽  
Evaporation Dynamics

Near-azeotropic volatility behavior of hydrous and anhydrous ethanol gasoline mixtures and impact on droplet evaporation dynamics

2018 ◽  
Vol 181 ◽  
pp. 166-174 ◽  
Author(s):  
Bahareh Abdollahipoor ◽  
Saeid Aghahossein Shirazi ◽  
Kenneth F. Reardon ◽  
Bret C. Windom
Keyword(s):  
Droplet Evaporation ◽  
Anhydrous Ethanol ◽  
Evaporation Dynamics

Evaporation dynamics of a sessile droplet on glass surfaces with fluoropolymer coatings: focusing on the final stage of thin droplet evaporation

Soft Matter ◽  
2018 ◽  
Vol 14 (10) ◽  
pp. 1811-1821 ◽  
Author(s):  
Elizaveta Ya. Gatapova ◽  
Anna M. Shonina ◽  
Alexey I. Safonov ◽  
Veronica S. Sulyaeva ◽  
Oleg A. Kabov
Keyword(s):  
Final Stage ◽  
Liquid Droplet ◽  
Droplet Evaporation ◽  
Sessile Droplet ◽  
Evaporation Dynamics ◽  
Glass Surfaces

Liquid droplet on the “soft” coating can finalize as very thin droplet completely wetting the surface. We detail the thin droplet evaporation dynamics by image-analyzing interference technique.

An Accurate and Simple Approach to Allow for the Transient Temperature Gradient in a Vaporizing Droplet

2012 ◽  
Author(s):  
Alexander Snegirev ◽  
Victor Talalov
Keyword(s):  
Temperature Gradient ◽  
Life Time ◽  
Droplet Evaporation ◽  
Transient Temperature ◽  
Internal Temperature ◽  
Ambient Temperatures ◽  
Wide Range ◽  
Order Polynomial ◽  
Volatile Liquid ◽  
Evaporation Dynamics

The purpose of this work is to analyze the importance of considering internal temperature gradient in modeling droplet evaporation, and to demonstrate performance of simplified methods in which the temperature gradient is approximately taken into account. Based on three characteristic time scales, two dimensionless criteria have been identified which determine magnitude of the internal temperature gradient and its effect on the evaporation dynamics. Numerical values of these criteria in a wide range of ambient temperatures show that the effect of the internal temperature gradient is more pronounced in more volatile liquid at higher ambient temperatures. Although droplet life time predictions are not sensitive to the internal temperature gradient, its effect might be strong at the initial stages of droplet evaporation, and this substantiates the need in robust and computationally inexpensive methods to take it into account. Two simple and yet accurate approaches (quasi-steady higher order polynomial approximation and the integral balance method) have been favourably tested and recommended for use in CFD spray modeling.

A Numerical Study of Ethanol-Water Droplet Evaporation

2017 ◽  
Author(s):  
Giandomenico Lupo ◽  
Christophe Duwig
Keyword(s):  
Water Droplet ◽  
Composition Range ◽  
Numerical Study ◽  
Ambient Pressure ◽  
Droplet Evaporation ◽  
Droplet Temperature ◽  
Gas Phases ◽  
Initial Droplet ◽  
Liquid Phase Composition ◽  
Evaporation Dynamics

The present effort focuses on detailed numerical modelling of the evaporation of an ethanol-water droplet. The model intends to capture all relevant details of the process: it includes species and heat transport in the liquid and gas phases, and detailed thermo-physical and transport properties, varying with both temperature and composition. Special attention is reserved to the composition range near and below the ethanol/water azeotrope point at ambient pressure. For this case, a significant fraction of the droplet lifetime exhibits evaporation dynamics similar to those of a pure droplet. The results are analysed and model simplifications are examined. In particular, the assumptions of constant liquid properties, homogeneous liquid phase composition and no differential volatility may not be valid depending on the initial droplet temperature.

A Numerical Study of Ethanol–Water Droplet Evaporation

2017 ◽  
Vol 140 (2) ◽  
Author(s):  
Giandomenico Lupo ◽  
Christophe Duwig
Keyword(s):  
Water Droplet ◽  
Composition Range ◽  
Numerical Study ◽  
Ambient Pressure ◽  
Droplet Evaporation ◽  
Droplet Temperature ◽  
Gas Phases ◽  
Initial Droplet ◽  
Liquid Phase Composition ◽  
Evaporation Dynamics

The present effort focuses on detailed numerical modeling of the evaporation of an ethanol–water droplet. The model intends to capture all relevant details of the process: it includes species and heat transport in the liquid and gas phases, and detailed thermophysical and transport properties, varying with both temperature and composition. Special attention is reserved to the composition range near and below the ethanol/water azeotrope point at ambient pressure. For this case, a significant fraction of the droplet lifetime exhibits evaporation dynamics similar to those of a pure droplet. The results are analyzed, and model simplifications are examined. In particular, the assumptions of constant liquid properties, homogeneous liquid phase composition and no differential volatility may not be valid depending on the initial droplet temperature.

Influence of substrate wettability and air humidity on self-assembly of nanoparticles in evaporating droplets of colloidal solutions

2019 ◽  
Vol 5 (3) ◽  
pp. 83-96
Author(s):  
Mohammed Ali Y. Ali Al-Muzaiqer ◽  
Tair E. Esenbaev ◽  
Nikolai S. Kubochkin ◽  
Maria D. Goreva ◽  
Natalya A. Ivanova
Keyword(s):  
Aluminum Oxide ◽  
Self Assembly ◽  
Droplet Evaporation ◽  
Air Humidity ◽  
Colloidal Solutions ◽  
Evaporation Time ◽  
Oxide Particles ◽  
Influence Of Substrate ◽  
Evaporation Dynamics

This article discusses the influence of substrate wettability and air humidity on the process of nanoparticle patterns formation in evaporating microdroplets. The process of self-assembly of polystyrene and aluminum oxide particles on the glass covered with titanium, tungsten, carbon, and teflon was investigated.<br> The droplet evaporation time and the obtained packing of particles with increasing hydrophobicity of substrates were evaluated. The influence of air humidity on the evaporation dynamics and on the process of nanoparticles self-assembly is revealed.

Droplet Evaporation Dynamics of Low Surface Tension Fluids Using the Steady Method

Langmuir ◽  
2020 ◽  
Vol 36 (46) ◽  
pp. 13860-13871
Author(s):  
A. Alperen Günay ◽  
Marisa Gnadt ◽  
Soumyadip Sett ◽  
Hamed Vahabi ◽  
Arun K. Kota ◽  
...  
Keyword(s):  
Surface Tension ◽  
Droplet Evaporation ◽  
Evaporation Dynamics

Stereo Electron Microscopy Applied to High Resolution Freeze-Etch Replicas

1970 ◽  
Vol 28 ◽  
pp. 306-307
Author(s):  
L. Andrew Staehelin
Keyword(s):  
Electron Microscopy ◽  
Plastic Deformation ◽  
High Resolution ◽  
Smooth Surfaces ◽  
Small Particles ◽  
Membrane Surfaces ◽  
Wide Acceptance ◽  
New Information ◽  
Number Of Particles ◽  
Small Holes

Freeze-etched membranes usually appear as relatively smooth surfaces covered with numerous small particles and a few small holes (Fig. 1). In 1966 Branton (1“) suggested that these surfaces represent split inner mem¬brane faces and not true external membrane surfaces. His theory has now gained wide acceptance partly due to new information obtained from double replicas of freeze-cleaved specimens (2,3) and from freeze-etch experi¬ments with surface labeled membranes (4). While theses studies have fur¬ther substantiated the basic idea of membrane splitting and have shown clearly which membrane faces are complementary to each other, they have left the question open, why the replicated membrane faces usually exhibit con¬siderably fewer holes than particles. According to Branton's theory the number of holes should on the average equal the number of particles. The absence of these holes can be explained in either of two ways: a) it is possible that no holes are formed during the cleaving process e.g. due to plastic deformation (5); b) holes may arise during the cleaving process but remain undetected because of inadequate replication and microscope techniques.

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