Journal ArticleDOI
Sessile droplet evaporation in the atmosphere of different gases under forced convection
A. E. Korenchenko,A.A. Zhukova +1 more
TLDR
In this paper , the authors considered the diffusion-limited evaporation process when the diffusive gas flux to the droplet surface is compensated by the convective Stefan flow from the surface.Abstract:
The phenomenon of evaporation from the surface of a liquid droplet into a neutral noncondensible gas was numerically studied by taking forced convection gaseous flow into account. The mathematical model considers the effects of surface tension, gravitational force, viscosity of both liquid and gaseous media, as well as the Stefan flow from the droplet surface, possible free gravitational convection, and the Marangoni convection in droplets, and it is designed to describe diffusion-limited evaporation. We consider the diffusion-limited evaporation process when the diffusive gas flux to the droplet surface is compensated by the convective Stefan flow from the surface. The results indicate an interaction of the liquid and gaseous media. Convective gas flows cause the liquid to move and a vortex to occur in the droplet. The flow velocities in a vortex are 103 times less than the characteristic velocity of forced convection flow in air. The droplet surrounded by gaseous flow changes its shape and oscillates, which causes a gas-density wave. Calculations have shown that the diffusion-limited evaporation rate does not change in the presence of forced convection, which contradicts most of the known experimental works. The possible reason for this discrepancy is the presence of non-equilibrium conditions at the liquid–gas interface in experiments. This leads to a consequent change of the evaporation mode to non-diffusive, while the numerical model postulates the Stefan condition and diffusion-limited evaporation.read more
Citations
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Journal ArticleDOI
Predicting the lifetimes of evaporating droplets in ordered arrays
TL;DR: In this article , the authors demonstrate that the presence of surrounding droplets causes a shielding effect that, in turn, leads to a decrease in the evaporation rate compared to the same droplet in isolation.
Journal ArticleDOI
Droplet Evaporation on Pillar Structured Surface: A 3D Lattice Boltzmann Numerical Study
Tianjiao Wang,Gang Xiang +1 more
TL;DR: In this paper , a three-dimensional symmetric lattice Boltzmann (LB) model is built up to investigate evaporation of a sessile droplet on pillar-structured surfaces.
Journal ArticleDOI
Evaluation of three methods of static contact angle measurements for TiO<sub>2</sub> nanofluid droplets during evaporation
TL;DR: In this paper , three methods of static contact angle measurements of deionized (DI) water and TiO 2 nanofluid droplets with three concentrations (0.5, 1, and 5%) that evaporate on the substrate of three different temperatures were compared; the difference between the results of the mean contact angles were identified; the highest standard deviation was recorded for the Young-Laplace and circle methods.
Journal ArticleDOI
Effect of surface wettability on evaporation rate of droplet array
TL;DR: In this paper , the authors developed a model involving a contact angle function to accurately predict the evaporation rate of droplets with an arbitrary contact angle in the array, and the proposed model was experimentally validated for arrayed droplets evaporating on flat hydrophilic and hydrophobic surfaces.
Journal ArticleDOI
Convective transport characteristics of condensing droplets in moist air flow
Zihong Wu,Li Tao Yang,Shaokai Zheng,Shu-Rong Gao,Yan-Ru Yang,Tian Gao,Bengt Sundén,Xiaodong Wang +7 more
TL;DR: In this article , a three-dimensional transient multiphysics coupling model was developed to investigate the transport characteristics of condensing droplets in convective moist air flow, which typically interconnects heat transfer with vapor-liquid phase change, mass transport, and fluid flow.
References
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Journal ArticleDOI
Hydrodynamic Model of Steady Movement of a Solid / Liquid / Fluid Contact Line
Chun Huh,L. E. Scriven +1 more
TL;DR: In this paper, a flat fluid interface moving steadily over a flat solid is modeled with the creeping flow approximation, which turns out to be self-consistent, and the role of long-range forces are explored with the aid of the lubrication flow approximation.
Journal ArticleDOI
Evaporation of a Sessile Droplet on a Substrate
Hua Hu and,Ronald G. Larson +1 more
TL;DR: In this article, the evaporation of a sessile droplet with a pinned contact line was investigated experimentally, by analytic theory and by computation using the finite element method (FEM).
Journal ArticleDOI
Pattern formation in drying drops
TL;DR: The drop itself can generate one of the essential conditions for ring formation to occur: contact line pinning, and it is shown that when self-induced pinning is the only source of pinning an array of patterns-that include cellular and lamellar structures, sawtooth patterns, and Sierpinski gaskets-arises from the competition between dewetting and contact linePinning.
Journal ArticleDOI
The evaporation of sessile or pendant drops in still air
R.G Picknett,R Bexon +1 more
TL;DR: In this paper, a theoretical analysis of the evaporation rate and residual mass of a drop on a surface is presented for contact angles ranging from near zero up to 180°.
Journal ArticleDOI
Vibrated sessile drops: transition between pinned and mobile contact line oscillations.
TL;DR: The hysteresis acts as “solid” friction on the contour oscillations, and gives rise to a stick-slip regime at intermediate amplitude, which is interpreted as the decrease of the resonance frequencies at larger vibration amplitudes.
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