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Coatings
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Fluid Dynamics Applications in Coatings and Thin Films
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Fluid Dynamics Applications in Coatings and Thin Films

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Liquid–Fluid Coatings, Surfaces and Interfaces".

Deadline for manuscript submissions: closed (31 December 2022) | Viewed by 6717

Special Issue Editor

Dr. Rodica Borcia

E-Mail Website
Guest Editor
Institute of Physics, Brandenburg University of Technology, 03044 Cottbus, Germany
Interests: thermal convection (Rayleigh-Benard or Marangoni convection); waves and instabilities; physics of interface; phase field models; binary mixtures; thin-liquid films; lubrication (long-wave) approximation; pattern formation; self-organization

Special Issue Information

Dear Colleagues,

We invite researchers to submit their research to the Special Issue “Fluid Dynamics Applications in Coatings and Thin Films”. Fluid dynamics describes the movement of liquids and gases and has many practical applications in the fields of physics and engineering. It is a varied field encompassing aeronautics, aerodynamics, hydraulics, acoustics, and hydrology, among others.

It is an area of great interest to materials scientists, as it can assist in the research and development of many coatings and films for use in applications ranging from reducing friction to hydrophobicity and thin liquid films. It provides a structure on which practical problems can be solved and, with the growth of computational modelling methodologies across all scientific disciplines in recent times, has become more important than ever in the development of new coatings for a varied range of applications.

In particular, the topics of interest include (but are not limited to):

  • Hydrodynamics;
  • Thermal convection;
  • Waves and instabilities;
  • Physics of interfaces;
  • Multi-component flows;
  • Thin liquid films;
  • Self-organization;
  • Pattern formation.

Papers that fall within the subjects of physics, chemistry, materials science, or mechanical engineering providing comprehensive insight into fluid dynamics, interface physics, and thin liquid films are suitable for this Special Issue.

Dr. Rodica Borcia
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. Coatings 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 2600 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

  • thermal convection (Rayleigh-Benard or Marangoni convection)
  • waves and instabilities
  • physics of interface
  • phase field models
  • binary mixtures
  • thin-liquid films
  • lubrication (long-wave) approximation
  • pattern formation and self-organization

Published Papers (3 papers)

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Research

14 pages, 4667 KiB  
Article
Rational Analysis of Drag Reduction Variation Induced by Surface Microstructures Inspired by the Middle Section of Barchan Dunes at High Flow Velocity
by Jiawei Jiang, Yizhou Shen, Yangjiangshan Xu, Zhen Wang, Senyun Liu, Weilan Liu and Jie Tao
Coatings 2022, 12(5), 563; https://doi.org/10.3390/coatings12050563 - 21 Apr 2022
Cited by 1 | Viewed by 1444
Abstract
Aerodynamic drag reduction is a key element for the design of aircrafts, and it is also considered to be affected by the flow velocity. Herein, the influence of high flow velocity on the drag reduction induced by the surface microstructure inspired by a [...] Read more.
Aerodynamic drag reduction is a key element for the design of aircrafts, and it is also considered to be affected by the flow velocity. Herein, the influence of high flow velocity on the drag reduction induced by the surface microstructure inspired by a cross-section of barchan dune was investigated by the computational fluid dynamics method in this work. Overall, the drag reduction ratio was decreased while the pressure drag and viscous resistance enhanced simultaneously with the augmentation of flow velocity. Otherwise, drag analysis revealed that the total drag was a power function of flow velocity, which meant that the effect of flow velocity on drag was extremely fierce. Additionally, the microstructure improved the thickness of the boundary layer with a growth rate of 14.2%, and then reduced the viscosity resistance with limits during the development process of flow velocity. Furthermore, the micro-vortex caused by the surface microstructure provided the reverse wall shear stress, with the maximum value ranging from −4.77 Pa to −51.27 Pa, and then reduced the velocity gradient above the microstructure, thereby improving the drag reduction. However, both Reynolds-averaged Navier-Stokes (RANS) and large eddy simulation (LES) calculations showed that the excessive velocity could lead to the dissipation of micro-vortex, which augmented the contact area between the fluid and the surface, resulting in the enlargement of viscous resistance. Finally, it was confirmed that the variation of surface microstructure height had a significant influence on drag reduction at high flow velocity. The underlying mechanism of drag reduction could also provide theoretical guidance for the design and optimization of drag reduction coatings in aeronautical applications. Full article
(This article belongs to the Special Issue Fluid Dynamics Applications in Coatings and Thin Films)
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25 pages, 17860 KiB  
Article
Effects of Magnetohydrodynamics Flow on Multilayer Coatings of Newtonian and Non-Newtonian Fluids through Porous Inclined Rotating Channel
by Nasir Shehzad, Ahmad Zeeshan, Muhammad Shakeel, Rahmat Ellahi and Sadiq M. Sait
Coatings 2022, 12(4), 430; https://doi.org/10.3390/coatings12040430 - 23 Mar 2022
Cited by 50 | Viewed by 2897
Abstract
In this study, we investigated multilayer coatings fully developed with steady Newtonian and non-Newtonian fluids through parallel inclined plates. The channel was rotating about the y-axis with angular velocity Ω. The channel contained three regions; Region 1 and Region 3 were [...] Read more.
In this study, we investigated multilayer coatings fully developed with steady Newtonian and non-Newtonian fluids through parallel inclined plates. The channel was rotating about the y-axis with angular velocity Ω. The channel contained three regions; Region 1 and Region 3 were filled with Newtonian fluid, while Region 2 had Jeffrey fluid through a porous medium. The governing equations were formed by using Navier stokes and energy equations. The equations were coupled and were non-linear due to the involvement of Darcy’s dissipation terms. The systems of equations for Region 1 and Region 3 were solved analytically, while the equations of Region 2 were solved by using the regular perturbation method. The effects of governing parameters such as magnetic field, Grashof number, the ratio of heights, angle of inclination, and ratio of viscosities on velocity and temperature were investigated, and the results are presented graphically in this paper. It is noted that the increase in buoyancy force incorporated through the Grashof number and the angle of inclination enhanced the axial and transverse velocities and the temperature for the three layers. We found that the Nusselt number increases by increasing the couple stress parameter and magnetic field parameters, and skin friction decreases at the lower plate. The main observation is that temperature and both velocity profiles increased in Region 2 with the increase in the Jeffrey parameter. Full article
(This article belongs to the Special Issue Fluid Dynamics Applications in Coatings and Thin Films)
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18 pages, 4165 KiB  
Article
Significance of Synthetic Cilia and Arrhenius Energy on Double Diffusive Stream of Radiated Hybrid Nanofluid in Microfluidic Pump under Ohmic Heating: An Entropic Analysis
by Najma Saleem and Sufian Munawar
Coatings 2021, 11(11), 1292; https://doi.org/10.3390/coatings11111292 - 25 Oct 2021
Cited by 20 | Viewed by 1710
Abstract
This study investigates the thermal aspects of magnetohydrodynamic double diffusive flow of a radiated Cu-CuO/Casson hybrid nano-liquid through a microfluidic pump in the presence of electroosmosis effects. Shared effects of the Arrhenius activation energy and the Joule heating on the intended liquid transport [...] Read more.
This study investigates the thermal aspects of magnetohydrodynamic double diffusive flow of a radiated Cu-CuO/Casson hybrid nano-liquid through a microfluidic pump in the presence of electroosmosis effects. Shared effects of the Arrhenius activation energy and the Joule heating on the intended liquid transport are also incorporated. The inner wall of the pump is covered with electrically charged fabricated cilia mat that facilitates flow actuation and micro-mixing process. The governing equations for the proposed problem are simplified by utilizing the Debye-Hückel and lubrication approximations. The numerical solutions are calculated with the aid of shooting technique. The analysis reports that the substantial effects of electroosmosis contribute an important role in cooling process. Existence of electric double layer stimulates an escalation in liquid stream in the vicinity of the pump surface. The Arrhenius energy input strengthens the mass dispersion and regulates the thermal treatment. The proposed geometry delivers a deep perception that fabricated cilia in electroosmotic pumps are potential pharmaceutical micromixers for an effective flow and minimum entropy generation rate. Full article
(This article belongs to the Special Issue Fluid Dynamics Applications in Coatings and Thin Films)
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