The Lifetimes of Evaporating Sessile Droplets of Water Can Be Strongly Influenced by Thermal Effects

Schofield, Feargus G. H.; Pritchard, David; Wilson, S. K.; Sefiane, Khellil

doi:10.3390/fluids6040141

Cited by 8 publications

(4 citation statements)

References 37 publications

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“…2009; Schofield et al. 2021) effects can be important, while in other situations buoyancy effects within the droplet (see, for example, Edwards et al. 2018 and Li et al.…”

Section: Discussionmentioning

confidence: 99%

Evaporation of a thin droplet in a shallow well: theory and experiment

D’Ambrosio¹,

Colosimo

Duffy³

et al. 2021

J. Fluid Mech.

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Motivated by the industrial manufacture of organic light-emitting-diode displays, we formulate and analyse a mathematical model for the evolution of a thin droplet in a shallow axisymmetric well of rather general shape both before and after touchdown that accounts for the spatially non-uniform evaporation of the fluid, perform physical experiments using three cylindrical wells with different small aspect ratios, and validate the mathematical model by comparing the present experimental results with the corresponding theoretical predictions for a cylindrical well.

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“…2009; Schofield et al. 2021) effects can be important, while in other situations buoyancy effects within the droplet (see, for example, Edwards et al. 2018 and Li et al.…”

Section: Discussionmentioning

confidence: 99%

Evaporation of a thin droplet in a shallow well: theory and experiment

D’Ambrosio¹,

Colosimo

Duffy³

et al. 2021

J. Fluid Mech.

Self Cite

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“…As the temperature is increased linearly, the results show that the time taken to evaporate to the specified droplet radius exhibits nonlinear shortening, but the increase in flow velocity and temperature at each point on the liquid surface exhibits a quasi-linear increasing profile. Feargus [28] investigated the process of droplet evaporation on the thermally conducting substrate by constructing a coupling model and ignoring the Marangoni effect, emphasizing that the initial contact angle and substrate temperature will both affect the lifetime of the droplet. This paper considers the Marangoni effect and considers environmental temperature as a variable for extensive research, and the curve between the droplet lifetime and the environmental temperature is obtained as shown in Figure 15.…”

Section: Effect Of Ambient Temperature On Droplet Evaporationmentioning

confidence: 99%

“…It can be seen that, when the temperature is on the order of 297.15 K to 317.15 K, there is a nonlinear relationship between droplet lifetime (time required for evaporation) and ambient temperature; the higher the temperature, the shorter the droplet lifetime, but the higher the temperature, the lower the rate of droplet lifetime decay. Feargus [28] investigated the process of droplet evaporation on the thermally conducting substrate by constructing a coupling model and ignoring the Marangoni effect, emphasizing that the initial contact angle and substrate temperature will both affect the lifetime of the droplet. This paper considers the Marangoni effect and considers environmental temperature as a variable for extensive research, and the curve between the droplet lifetime and the environmental temperature is obtained as shown in Figure 15.…”

Section: Effect Of Ambient Temperature On Droplet Evaporationmentioning

confidence: 99%

Influence of Marangoni Effect on Heat and Mass Transfer during Evaporation of Sessile Microdroplets

Liu

Deng

2022

Micromachines

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Evaporative cooling is an important method for controlling the temperature of micro devices, and heat and mass transfer from the microdroplets in the evaporation process directly affect the cooling performance. In order to study the droplet heat and mass transfer law in the droplet evaporation process, this paper builds a coupled thermal mass model of droplet evaporation and tests the accuracy of the numerical model through theoretical results. In order to study the influence of the Marangoni effect on the droplet evaporation process and the effects of different initial droplet radius and ambient temperature on the temperature and flow, fields within the droplet are compared. From this result, it can be seen that the droplet volume is 20 μL, and the maximum flow velocity in the droplet is 0.34 mm/s, without taking into account the Marangoni effect. When the Marangoni effect is taken into account, the maximum flow velocity increases by almost 100 times. The Marangoni effect can cause the convection in the droplet to change direction, and the formation of the Marangoni flow may affect the temperature distribution within the droplet, thereby increasing the evaporation efficiency by 2.5%. The evaporation process will increase the velocity of the air close to the surface of the liquid, but the increase in air velocity close to the liquid surface is not sufficient to reinforce evaporation. There is a non-linear relationship between increasing ambient temperature and increasing evaporation efficiency. For every 5 °C increase in ambient temperature, the maximum increase in the rate of evaporation is approximately 22.7%.

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“…The lifetime of the evaporating droplet has an important impact on the salt patterns left upon complete drying as it determines the time scope for competing flow processes like diffusion, convection and Marangoni effects to take effect. There is much work on the effect of substrate temperature on the lifetime of an evaporating droplet [32][33][34][35]. In such cases, the thermal conductivity contrast between substrate and droplet solution can greatly affect the droplet drying dynamics and the residue pattern at the completion of drying.…”

Section: Introductionmentioning

confidence: 99%

Aggregation patterns of copper sulphate salt via droplet drying: mediation by surface hydrophobicity and salt concentration

Haque

Bhattacharyya²,

Dutta

2021

Eur. Phys. J. E

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Patterns in drying droplets formed from colloidal solution of copper sulphate and gelatin are investigated with respect to variation of substrate hydrophobicity and salt concentration. Hydrophilic substrates as (i) glass, (ii) quartz and hydrophobic substrate as (iii) polypropylene (PP) have been used. It is observed that the dry residue pattern of salt crystals shows curved branches of crystalline aggregate growth about droplet centre for hydrophilic substrates, while thick, light and dark concentric bands of aggregates are observed for hydrophobic substrates. The geometry and topology of the patterns have been characterized through an analysis of fractal dimension and the topological measure, Euler characteristic. The fractal dimension of the deposit increases substantially with salt concentration for hydrophilic substrates, but decreases with concentration for hydrophobic substrate. Our analysis leads us to propose that an optimal viscosity contrast that facilitates prominent viscous fingers is a function of contact angle and salt concentration. We propose that substrate hydrophobicity and salt concentration together are responsible for DLA-like aggregation in evaporating droplets.

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The Lifetimes of Evaporating Sessile Droplets of Water Can Be Strongly Influenced by Thermal Effects

Cited by 8 publications

References 37 publications

Evaporation of a thin droplet in a shallow well: theory and experiment

Evaporation of a thin droplet in a shallow well: theory and experiment

Influence of Marangoni Effect on Heat and Mass Transfer during Evaporation of Sessile Microdroplets

Aggregation patterns of copper sulphate salt via droplet drying: mediation by surface hydrophobicity and salt concentration

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