Sessile droplets shape response to complex body forces

Ríos-López, Inmaculada; Petala, Maria; Kostoglou, Margaritis; Karapantsios, Thodoris D.

doi:10.1016/j.colsurfa.2019.03.096

Cited by 11 publications

(13 citation statements)

References 23 publications

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“…Forced wetting tests on biofilm-coated surfaces are carried out using Kerberos, an innovative device whose major functionality is the study of the evolution of sessile droplet shape and motion under external body forces as shown in previous research works. − The device combines simultaneous rotation and tilting to provide independent control of tangential and normal forces acting on a droplet placed on a solid substrate. Kerberos allows monitoring of the 3D droplet shape as a function of time, by recording images with three independent wireless cameras that observe the droplet simultaneously along the 3 orthogonal directions X , Y , Z .…”

Section: Methodsmentioning

confidence: 99%

“…During an experiment, the chamber containing the sample and the cameras allows to control the temperature and air humidity surrounding the sample. Detailed description of the main features and capabilities of the device along with analysis of spreading/sliding of droplets on different solid substrates at varying tilting angles and rotation speeds can be found in. , In this work no tilting is done, while centrifugal forces are employed to induce droplet deformation, spreading, and sliding depending on the applied conditions (Figure ). Tests are carried out at 25 ± 2 °C and at RH = 50 ± 5%.…”

Section: Methodsmentioning

confidence: 99%

“…In this work, Pseudomonas fluorescens AR 11 bacteria cultivated on glass substrates is used as a model microorganism to form biofilms. Wetting properties on dehydrated biofilms are investigated using a custom-made device, named Kerberos, dedicated to the study of physics of forced wetting of droplets deposited on different substrates. − Kerberos employs independent control of centrifugal and gravitational forces acting on droplets by combining rotation and tilting while at the same time monitoring the droplet shape deformation and motion by three cameras viewing the droplet at the three orthogonal directions ( X , Y , and Z ). The present experiments refer exclusively to rotation of horizontal substrates (no tilting).…”

Section: Introductionmentioning

confidence: 99%

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Wetting of Dehydrated Hydrophilic Pseudomonas fluorescens Biofilms under the Action of External Body Forces

et al. 2021

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Wetting of dehydrated Pseudomonas f luorescens biofilms grown on glass substrates by an external liquid is employed as a means to investigate the complex morphology of these biofilms along with their capability to interact with external fluids. The porous structure left behind after dehydration induces interesting droplet spreading on the external surface and imbibition into pores upon wetting. Static contact angles and volume loss by imbibition measured right upon droplet deposition indicate that biofilms of higher incubation times show a higher porosity and effective hydrophilicity. Furthermore, during subsequent rotation tests, using Kerberos device, these properties dictate a peculiar forced wetting/spreading behavior. As rotation speed increases a long liquid tail forms progressively at the rear part of the droplet, which stays pinned at all times, while only the front part of the droplet depins and spreads. Interestingly, the experimentally determined retention force for the onset of droplet sliding on biofilm external surface is lower than that on pure glass. An effort is made to describe such complex forced wetting phenomena by presenting apparent contact angles, droplet length, droplet shape contours, and edges position as obtained from detailed image analysis.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Wetting of Dehydrated Hydrophilic Pseudomonas fluorescens Biofilms under the Action of External Body Forces

et al. 2021

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“…It is shown that the existing models for the contact line motion, even for the simple process of quasi-static spreading, suffers from several inconsistencies or artificial features. There is a need for additional experimental data on the process under complex force application scenarios (e.g., using a Kerberos device [28,30]) in order to derive reliable models. The case of small contact angle systems is of particular interest for this purpose, as they exhibit considerable spreading.…”

Section: Discussionmentioning

confidence: 99%

“…This is due to the fact that the relevant experimental studies are done on the basis of the rotation of horizontal drops or for drops on inclined plates. Recently, the device Kerveros [28,30] has been developed, which allows simultaneous control of the two Bond numbers by adjusting both the rotation frequency and inclination angle. Figure 5.…”

Section: Colloids Interfaces 2019 3 X For Peer Review 5 Of 15mentioning

confidence: 99%

Contact Angle Profiles for Droplets on Omniphilic Surfaces in the Presence of Tangential Forces

Kostoglou

Karapantsios

2019

Colloids and Interfaces

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In real life, sessile droplets usually have a three-dimensional shape, making it difficult to understand their forced wetting behavior, both from an experimental and a theoretical perspective. Even in the case of spreading under quasi-static conditions, where the droplet shape is described by the Young–Laplace equation, there is no fundamental approach to describe the contact line evolution. In the present work, a few existing approaches on this issue are analyzed and assessed. It is shown that an experimentally inspired fixed shape for the contact line of droplets that are spreading under the action of tangential forces can be considered equivalent to a theory for contact line motion. There is a lack of experimental data for contact line evolution under arbitrary scenarios of forces. Such data will be very helpful for the further development of the suggested approach to contact line motion. Of particular interest is the case of small contact angle droplets, for which a top view can clearly indicate the contact line location. On the contrary, in such droplets, the direct experimental measurement of contact angle profile is very difficult. This must be estimated theoretically; thus, a special approach has been developed here for this purpose.

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Freezing of sessile deformed water droplet under natural convection at early frosting stage in an ASHP unit

Song,

Zhang

2025

Frosting for Air Source Heat Pumps

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Sessile droplets shape response to complex body forces

Cited by 11 publications

References 23 publications

Wetting of Dehydrated Hydrophilic Pseudomonas fluorescens Biofilms under the Action of External Body Forces

Wetting of Dehydrated Hydrophilic Pseudomonas fluorescens Biofilms under the Action of External Body Forces

Contact Angle Profiles for Droplets on Omniphilic Surfaces in the Presence of Tangential Forces

Freezing of sessile deformed water droplet under natural convection at early frosting stage in an ASHP unit

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