Motion of self-rewetting drop on a substrate with a constant temperature gradient

Xu, Ze-Lai; Chen, Jun-Yuan; Liu, Haoran; Sahu, Kirti Chandra; Ding, Hang

doi:10.1017/jfm.2021.130

Cited by 12 publications

(9 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The migration of talc particles was used to investigate this phenomenon. Subsequently, these fluids have been referred to as “self-rewetting” fluids and the unusual superspreading behavior observed in sessile droplets of such fluids has been reported in nonisothermal systems. , Parsa et al experimentally investigated the drying patterns in sessile droplets of distilled water and 1-butanol (a self-rewetting fluid) with CuO nanoparticles in smooth silicon substrate at different temperatures using optical microscopy and infrared thermography. The three distinct drying patterns were observed as the temperature was varied, namely, a uniform pattern on a nonheated surface, dual-ring pattern, and stick–slip patterns.…”

Section: Introductionmentioning

confidence: 99%

Evaporation Dynamics of a Sessile Droplet of Binary Mixture Laden with Nanoparticles

et al. 2021

Self Cite

View full text Add to dashboard Cite

We investigate the evaporation dynamics of a sessile droplet of ethanol–water binary mixtures of different compositions laden with alumina nanoparticles and compare with the no-loading condition at different substrate temperatures. Shadowgraphy and infrared imaging methods are used, and the experimental images are postprocessed using a machine learning technique. We found that the loading and no-loading cases display distinct wetting and contact angle dynamics. Although the wetting diameter of a droplet decreases monotonically in the absence of loading, the droplet with 0.6 wt % nanoparticle loading remains pinned for the majority of its lifetime. The temporal variation of the normalized droplet volume in the no-loading case has two distinct slopes, with ethanol and water phases dominating the early and late stages of evaporation, respectively. The normalized droplet volume with 0.6 wt % loading displays a nearly linear behavior because of the increase in the heat transfer rate. Our results from infrared imaging reveal that a nanofluid droplet displays far richer thermal patterns than a droplet without nanoparticle loading. In nanoparticle-laden droplets, the pinning effect, as well as the resulting thermo-capillary and thermo-solutal convection, causes more intense internal mixing and a faster evaporation rate. Finally, a theoretical model is also developed that satisfactorily predicts the evaporation dynamics of binary nanofluid droplets.

show abstract

Section: Introductionmentioning

confidence: 99%

Evaporation Dynamics of a Sessile Droplet of Binary Mixture Laden with Nanoparticles

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…[34]. The Navier-Stoke solver used in the present study has been validated extensively and used in our previous studies [29,30,35]. Thus, here the numerical method is discussed briefly below only for the sake of completeness.…”

Section: Methodsmentioning

confidence: 99%

Two-layer channel flow involving a fluid with time-dependent viscosity

Sahu

2021

Environ Fluid Mech

Self Cite

View full text Add to dashboard Cite

A pressure-driven two-layer channel flow of a Newtonian fluid with constant viscosity (top layer) and a fluid with a time-dependent viscosity (bottom layer) is numerically investigated. The bottom layer goes through an ageing process in which its viscosity increases due to the formation of internal structure, which is represented by a Coussot-type relationship. The resultant flow dynamics is the consequence of the competition between structuration and de-structuration, as characterised by the dimensionless timescale for structuration ( ) and the dimensionless material property ( ) of the bottom fluid. The development of Kelvin-Helmholtz type instabilities (roll-up structures) observed in the Newtonian constant viscosity case was found to be suppressed as the viscosity of the bottom layer increased over time. It is found that, for the set of parameters considered in the present study, the bottom layer almost behaves like a Newtonian fluid with constant viscosity for 𝜏 > 10 and 𝛽 > 1 . It is also shown that decreasing the value of the Froude number stabilises the interfacial instabilities. The wavelength of the interfacial wave increases as the capillary number increases.

show abstract

“…9 Several studies discussed the heat transfer behavior of droplets and bubbles on inclined surfaces. [10][11][12][13][14] Also, DWC has been the subject of many kinds of research regarding the better heat transfer rate in comparison to the FWC in recent years. [15][16][17][18][19] As an instance, Wu et al 20 investigated analysis of the DWC on diverse substrates to detect influences of surface conductivity, numerically.…”

Section: Introductionmentioning

confidence: 99%

“…Regarding the cyclic nature of the process as well as the instability of the drop, the formation of a liquid film would be prevented and hence DWC would be achieved 9 . Several studies discussed the heat transfer behavior of droplets and bubbles on inclined surfaces 10–14 . Also, DWC has been the subject of many kinds of research regarding the better heat transfer rate in comparison to the FWC in recent years 15–19 .…”

Section: Introductionmentioning

confidence: 99%

Numerical scrutinization of dropwise condensation heat transfer on an inclined surface

2022

View full text Add to dashboard Cite

Recently, achieving an ameliorated heat transfer rate in dropwise condensation (DWC) has attracted the attention of many researchers. Several parameters, including chemical and physical properties of the substrate, inclination, and interfacial characteristics influence DWC heat transfer rate. The variation of inclination angle is followed by the change in droplet shape and consequently, the heat transfer rate are changed. In this study, the effect of droplet shape variation on diverse inclined substrates is simulated. Moreover, three‐dimensional mass, momentum, and energy equations considering the desired boundary conditions on the unstructured grid are utilized for the scrutinization of flow behavior and heat transfer for static and sliding droplets. For the sake of validation, the outcomes obtained from the simulation were compared with existent data in the literature and a proper agreement was attained. Regarding the outcomes, it was of concern that the influence of inclination angle on the droplet shape is more distinct at higher droplet volume; while no considerable change was seen on heat flux of small droplets by increasing the inclination angle. Furthermore, a higher heat transfer rate was noted by exceeding the inclination angle beyond a definite angle. Additionally, the increased heat transfer rate was affirmed by increasing the Marangoni number ( italicMa ) $({Ma})$.

show abstract

Motion of self-rewetting drop on a substrate with a constant temperature gradient

Abstract: Abstract

Cited by 12 publications

References 30 publications

Evaporation Dynamics of a Sessile Droplet of Binary Mixture Laden with Nanoparticles

Evaporation Dynamics of a Sessile Droplet of Binary Mixture Laden with Nanoparticles

Two-layer channel flow involving a fluid with time-dependent viscosity

Numerical scrutinization of dropwise condensation heat transfer on an inclined surface

Contact Info

Product

Resources

About