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Fluids
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Fluids and Surfaces, 2nd Edition
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Fluids and Surfaces, 2nd Edition

A special issue of Fluids (ISSN 2311-5521).

Deadline for manuscript submissions: 31 August 2024 | Viewed by 3854

Special Issue Editor

Dr. Manfredo Guilizzoni

E-Mail Website
Guest Editor
Department of Energy, Politecnico di Milano, Via Lambruschini 4, 20156 Milan, Italy
Interests: drops, bubbles and capillary phenomena; multiphase flow; experimental measurement techniques; computational fluid dynamics; real gases
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Interaction between fluids and surfaces plays a major role in a broad set of phenomena, ranging from natural ones to industrial applications, environment protection, and cultural heritage conservation. A deep understanding of fluid behavior in such scenarios has acquired increasing importance in recent years due to the growing number of devices and processes that are based on engineered surfaces, porous media, and miniaturization involving microfluidics.

Despite more than two centuries of studies, many aspects are still not thoroughly clarified for both static and dynamic conditions, particularly on innovative surfaces (by chemistry and/or morphology), within porous media, for complex fluids and when fluid dynamics, capillarity, and heat transfer are coupled.

The development of measurement techniques, down to the microscale, opens up new possibilities for experimental investigation, while the advent of computational fluid dynamics offers new tools for modeling and simulation.

In this Special Issue of Fluids, "Fluids and Surfaces (Volume II)", papers are invited on theoretical, experimental, and computational studies devoted to recent advances in the fields of wettability and adhesion for complex surfaces and/or complex fluids; fluids in porous media and the relationship between external wettability and in-pore behavior; capillarity-driven flows; reactive wetting and electrowetting; evaporation, Marangoni, and thermocapillary convection; drop impact onto liquid pools and still and moving films; drop impact onto heterogeneous or rough/engineered dry surfaces (including porous, flexible, and textile surfaces); and advanced measurement techniques in this field.

Dr. Manfredo Guilizzoni
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Fluids is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • static and dynamic wettability
  • capillary behavior of complex fluids
  • fluids in porous media
  • heat transfer for drops
  • drop impact
  • advanced measurement techniques
  • multiphase computational fluid dynamics

Related Special Issue

Published Papers (3 papers)

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Research

12 pages, 69161 KiB  
Article
Experimental Analysis of the Effect of Limescale on the Wettability of Indirect Evaporative Cooling System Plates
by Roberta Caruana, Luca Marocco, Paolo Liberati and Manfredo Guilizzoni
Fluids 2024, 9(3), 76; https://doi.org/10.3390/fluids9030076 - 17 Mar 2024
Viewed by 806
Abstract
Indirect evaporative cooling systems have attracted much interest in recent years as they guarantee good cooling effectiveness, with lower energy demand with respect to traditional systems, thus helping to address the issue of climate change. Many studies have shown that an increase in [...] Read more.
Indirect evaporative cooling systems have attracted much interest in recent years as they guarantee good cooling effectiveness, with lower energy demand with respect to traditional systems, thus helping to address the issue of climate change. Many studies have shown that an increase in the wettability of recuperator plates results in an improvement in the system performance. However, if the water injected into the system comes from the city water supply, it will contain calcium carbonate residuals, which will form limescale layers on the plates, thus possibly changing their wetting behavior. Therefore, the wettability of three surfaces (an aluminum uncoated surface, AL, a standard epoxy coating, STD, and a hydrophilic lacquer, HPHI) was analyzed in the presence of limescale formations, and compared with that obtained in a previous study for corresponding clean surfaces. The results showed that the HPHI contact angle was reduced in the presence of limescale (median: 50°), that for STD was slightly increased (median: 81°), and that for AL was again reduced (median: 75°). Consequently, HPHI was confirmed to be the most wettable surface in both clean and limescale conditions. Finally, an analysis was undertaken evaluating the spreading factor and the reversible work of adhesion, which were in good agreement with the qualitative visual observations of the plates covered with limescale. Full article
(This article belongs to the Special Issue Fluids and Surfaces, 2nd Edition)
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13 pages, 2821 KiB  
Article
Numerical Investigation of Gas Bubble Interaction in a Circular Cross-Section Channel in Shear Flow
by Daniel B. V. Santos, Gustavo P. Oliveira, Norberto Mangiavacchi, Prashant Valluri and Gustavo R. Anjos
Fluids 2024, 9(2), 32; https://doi.org/10.3390/fluids9020032 - 26 Jan 2024
Viewed by 1241
Abstract
This work’s goal is to numerically investigate the interactions between two gas bubbles in a fluid flow in a circular cross-section channel, both in the presence and in the absence of gravitational forces, with several Reynolds and Weber numbers. The first bubble is [...] Read more.
This work’s goal is to numerically investigate the interactions between two gas bubbles in a fluid flow in a circular cross-section channel, both in the presence and in the absence of gravitational forces, with several Reynolds and Weber numbers. The first bubble is placed at the center of the channel, while the second is near the wall. Their positions are set in such a way that a dynamic interaction is expected to occur due to their velocity differences. A finite element numerical tool is utilized to solve the incompressible Navier–Stokes equations and simulate two-phase flow using an unfitted mesh to represent the fluid interface, akin to the front-tracking method. The results show that the velocity gradient influences bubble shapes near the wall. Moreover, lower viscosity and surface tension force account for more significant interactions, both in the bubble shape and in the trajectory. In this scenario, it can be observed that one bubble is trapped in the other’s wake, with the proximity possibly allowing the onset of coalescence. The results obtained contribute to a deeper understanding of two-phase inner flows. Full article
(This article belongs to the Special Issue Fluids and Surfaces, 2nd Edition)
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10 pages, 1487 KiB  
Article
Study of Insect Impact on an Aerodynamic Body Using a Rotary Wing Simulator
by Mohammadamin Ghasemzadeh and Alidad Amirfazli
Fluids 2024, 9(1), 8; https://doi.org/10.3390/fluids9010008 - 27 Dec 2023
Viewed by 1200
Abstract
Laminar flow aircraft may potentially save fuel and reduce the emission of pollutants and greenhouse gases. However, laminar flow aircraft face challenges caused by contaminations on the wings, such as insect impact residue. To study insect residue on an aircraft airfoil, a new [...] Read more.
Laminar flow aircraft may potentially save fuel and reduce the emission of pollutants and greenhouse gases. However, laminar flow aircraft face challenges caused by contaminations on the wings, such as insect impact residue. To study insect residue on an aircraft airfoil, a new setup was developed that used rotary wings and shot an insect toward the leading edge. This setup kept insects intact before impact while airflow was maintained throughout the experiment. Additionally, the setup enabled the long-term observation of the impact residue while the test speed was adjusted. Two experiments were carried out to investigate inconsistencies from past studies about insect rupture velocity and the effect of airflow on residue. Drosophila Hydei was the insect used, and aluminum was used as the baseline substrate, which was also coated with polyurethane, acrylic, and two superhydrophobic coatings. Instead of a threshold velocity for the minimum rupture velocity of the insect, a range from initial insect rupture to the velocity at which insects ruptured in all instances was determined (i.e., 17–30 m/s). Furthermore, the presence of a coating (polyurethane) on the airfoil did not affect the minimum rupture velocity. It was observed that airflow, which has been previously mentioned as a mitigation method, did not change the residue amount after coagulation for all coatings. Full article
(This article belongs to the Special Issue Fluids and Surfaces, 2nd Edition)
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