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Symmetry
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Symmetry in Power Systems and Thermal Engineering
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Symmetry in Power Systems and Thermal Engineering

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Engineering and Materials".

Deadline for manuscript submissions: 31 January 2025 | Viewed by 6028

Special Issue Editors

Prof. Dr. Chih Ping Tso

E-Mail Website
Guest Editor
Faculty of Engineering and Technology, Multimedia University, Melaka 75450, Malaysia
Interests: thermal engineering; thermal physics; fluid mechanics; modeling and simulation
Dr. Gooi Mee Chen

E-Mail Website
Guest Editor
Faculty of Engineering and Technology, Multimedia University, Melaka 75450, Malaysia
Interests: convective heat transfer; boundary layer theory

Special Issue Information

Dear Colleagues,

This Special Issue is on original research in symmetry and asymmetry phenomena in thermal science and engineering, with emphasis on power systems and heat transfer engineering. Theoretical, experimental, and numerical studies are welcomed on all aspects of, but not limited to, the following: thermal power systems, submarine marine aeronautical and astronautical power systems, thermal management of large and small systems, conventional and alternative energies, fission and fusion technologies, high-power energy systems, augmentation of heat transfer, basic conduction, convection, radiation and multi-phase flow, sustainability, thermal environment, reduction in carbon footprint, advanced materials, and state-of-the-art technologies that improve thermal systems. We look forward to receiving your contributions to this Special Issue.

Prof. Dr. Chih Ping Tso
Dr. Gooi Mee Chen
Guest Editors

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. Symmetry 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 2400 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 power systems
  • energies
  • thermal science
  • thermal engineering
  • thermal management

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Further information on MDPI's Special Issue polices can be found here.

Published Papers (2 papers)

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Research

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22 pages, 4763 KiB  
Article
Effect of the Size of the Superhydrophobic Regions of Biphilic Surfaces on the Bubble Dynamics
by José Pereira, Ricardo Cautela, Ana Moita and António Moreira
Symmetry 2023, 15(4), 949; https://doi.org/10.3390/sym15040949 - 21 Apr 2023
Cited by 1 | Viewed by 2145
Abstract
The current work aims to experimentally evaluate the effect of the size of circular superhydrophobic regions of biphilic surfaces on the bubble dynamics under pool boiling conditions. Biphilic surfaces are structured surfaces with tunable wettability, presenting an array of hydrophobic small spots in [...] Read more.
The current work aims to experimentally evaluate the effect of the size of circular superhydrophobic regions of biphilic surfaces on the bubble dynamics under pool boiling conditions. Biphilic surfaces are structured surfaces with tunable wettability, presenting an array of hydrophobic small spots in a hydrophilic surface or vice versa. The factors that affect the bubble dynamics are of geometric nature such as the diameters of the bubbles, their volume, and the height of the centroid, and of more complex nature such as the departure frequency of the bubbles and the rate of evaporation mass transfer. In this study, the bubble dynamics and boiling performance were evaluated by adjusting the diameter of the single circular superhydrophobic regions. A stainless steel AISI 304 foil was used as the base hydrophilic region, and the superhydrophobic regions were made by spray coating the NeverWet® superhydrophobic solution over well-defined masks. The main conclusion was that the bubble dynamics are clearly affected by the diameter of the superhydrophobic spots. The smaller spots favored the generation of more uniform and stable bubbles, mainly due to the border surface tension forces’ dominance. With the increase in the diameter of the bubbles, the surface tension acting at the border with the much larger hydrophilic region impacts the process less. Thus, the smaller superhydrophobic regions had higher evaporation mass transfer rates. The region with the best pool boiling performance along with improved bubble dynamics was the superhydrophobic region with an 0.8 mm diameter, corresponding to a superhydrophobic area to total area ratio of 0.11%. Moreover, this experimental work confirmed that the bubble dynamics’ impacting factors such as the diameter at the various stages of development of the bubbles can be modulated according to the final objectives of the design and fabrication of the biphilic surfaces. The research significance and novelty of this work come from the comprehensive study of the geometrical pattern of the heat transfer surface in pool boiling conditions and its impact on the bubble dynamics and heat transfer capability. We also suggest further studies considering nanoscale superhydrophobic spot arrangements and the future usage of different working fluids such as nanofluids. Full article
(This article belongs to the Special Issue Symmetry in Power Systems and Thermal Engineering)
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Review

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35 pages, 8020 KiB  
Review
The State of the Art of Photovoltaic Module Cooling Techniques and Performance Assessment Methods
by Ihsan Okta Harmailil, Sakhr M. Sultan, Chih Ping Tso, Ahmad Fudholi, Masita Mohammad and Adnan Ibrahim
Symmetry 2024, 16(4), 412; https://doi.org/10.3390/sym16040412 - 1 Apr 2024
Cited by 1 | Viewed by 3196
Abstract
Due to its widespread availability and inexpensive cost of energy conversion, solar power has become a popular option among renewable energy sources. Among the most complete methods of utilizing copious solar energy is the use of photovoltaic (PV) systems. However, one major obstacle [...] Read more.
Due to its widespread availability and inexpensive cost of energy conversion, solar power has become a popular option among renewable energy sources. Among the most complete methods of utilizing copious solar energy is the use of photovoltaic (PV) systems. However, one major obstacle to obtaining the optimal performance of PV technology is the need to maintain ideal operating temperature. Maintaining constant surface temperatures is critical to PV systems’ efficacy. This review looks at the latest developments in PV cooling technologies, including passive, active, and combined cooling methods, and methods for their assessment. As advances in research and innovation progress within this domain, it will be crucial to tackle hurdles like affordability, maintenance demands, and performance in extreme conditions, to enhance the efficiency and widespread use of PV cooling methods. In essence, PV cooling stands as a vital element in the ongoing shift towards sustainable and renewable energy sources. Full article
(This article belongs to the Special Issue Symmetry in Power Systems and Thermal Engineering)
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