Freezing of sessile water droplet for various contact angles

Zhang, Haifeng; Zhao, Yugang; Lv, Rong; Yang, Chun

doi:10.1016/j.ijthermalsci.2015.10.027

Cited by 115 publications

(46 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…By plotting the freezing time as a function of the static CA (Fig. 5), a linear correlation regardless of the used laser-technology, and resulting topography, was observed, as it was already described elsewhere [32,33]. Two main factors explain this effect.…”

Section: Ice-formation Characterizationsupporting

confidence: 68%

Multifunctional aluminium surfaces – Laser-structured micropatterns with ice-repellent, superhydrophobic and easy-to-clean properties

et al. 2020

View full text Add to dashboard Cite

In this work, the fabrication of multifunctional periodic microstructures on pure aluminium is presented. Three different geometries were fabricated with feature sizes ranging between 7 µm and 50 µm by using laser-based microstructuring methods. In detail, nanosecond pulsed direct laser writing and picosecond pulsed direct laser interference patterning were used with infrared laser radiation. The wetting characteristics of these structures were investigated performing static water contact angle measurements as well as by measuring the contact angle hysteresis and the sliding angle. The final wetting results show constant static contact angles above 150°, permitting the water droplets to roll off the substrate as well as collecting contamination at the same time. This self-cleaning effect led to a reduction of up to 94% of the spread of 1 µm sized manganese oxide particles. In addition, the freezing time required for droplets laying on the patterned surfaces was increased nearly by 300% at a temperature of 20 °C below zero. Finally, the results are compared to finite element simulations of heat transfer.

show abstract

Section: Ice-formation Characterizationsupporting

confidence: 68%

Multifunctional aluminium surfaces – Laser-structured micropatterns with ice-repellent, superhydrophobic and easy-to-clean properties

et al. 2020

View full text Add to dashboard Cite

show abstract

“…[6], the effect of an inclined surface [7][8][9], internal heat transfer [10,11] and internal flow [12]. A number of studies have also experimentally shown that the contact angle, θ, has a strong influence on the water droplet freezing time, t f [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Modelling the dynamics of the flow within freezing water droplets

2018

View full text Add to dashboard Cite

The flow within freezing water droplets is here numerically modelled assuming fixed shape throughout freezing. Three droplets are studied with equal volume but different contact angles and two cases are considered, one including internal natural convection and one where it is excluded, i.e. a case where the effects of density differences is not considered. The shape of the freezing front is similar to experimental observations in the literature and the freezing time is well predicted for colder substrate temperatures. The latter is found to be clearly dependent on the plate temperature and contact angle. Including density differences has only a minor influence on the freezing time, but it has a considerable effect on the dynamics of the internal flow. To exemplify, in the vicinity of the density maximum for water (4 • C) the velocities are about 100 times higher when internal natural convection is considered for as compared to when it is not.

show abstract

“…One of these is inspired by the lotus leaf and the water strider. The passive anti-icing strategy based on hydrophobic surfaces has been investigated, which can retard freezing or frosting and facilitate water droplets sliding off [ 2 , 3 , 4 , 5 ]. The contact angle plays a fundamental role, in the hydrophobicity of the surfaces and on the water droplet freezing process.…”

Section: Introductionmentioning

confidence: 99%

Low-Voltage Icing Protection Film for Automotive and Aeronautical Industries

et al. 2020

View full text Add to dashboard Cite

High-performance heater films are here proposed. They manifest great applicative potentiality in the de-icing technology of aircraft and motor vehicles. The films are suitable to be integrated into composite structures for the de/anti-icing function, which can be activated if the need arises. The heating is based on the joule effect of the current flowing through the electrically conductive films. Voltage and current parameters have been set based on the generators’ capacities on-board an aircraft and a car, as well as on the energy consumption during the operating conditions and the autonomy in the time. Green processes have been employed through all preparative steps of the films, which are composed of expanded graphite (60% wt/wt) and polyvinyl alcohol (PVA) (40% wt/wt). The results reveal a very significant influence of the aspect ratio of the filler on the heating and de-icing performance and suggest how to enhance the de-icing efficiency saving energy and adapting the current on-board aircraft/car generators for de-icing operations.

show abstract

Freezing of sessile water droplet for various contact angles

Cited by 115 publications

References 27 publications

Multifunctional aluminium surfaces – Laser-structured micropatterns with ice-repellent, superhydrophobic and easy-to-clean properties

Multifunctional aluminium surfaces – Laser-structured micropatterns with ice-repellent, superhydrophobic and easy-to-clean properties

Modelling the dynamics of the flow within freezing water droplets

Low-Voltage Icing Protection Film for Automotive and Aeronautical Industries

Contact Info

Product

Resources

About