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New Advances in Two-Phase Heat and Mass Transfer for Efficient Energy Systems

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "J1: Heat and Mass Transfer".

Deadline for manuscript submissions: 20 August 2025 | Viewed by 615

Special Issue Editors


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Guest Editor
Department of Industrial Engineering, University of Padova, Padua 35131, Italy
Interests: multi-phase flow; two-phase heat and mass transfer; heat exchangers; energy storage systems; phase change materials; enhancement techniques

E-Mail Website
Guest Editor
Department of Industrial Engineering, University of Padova, Padua 35131, Italy
Interests: multi-phase flow; two-phase heat and mass transfer; heat exchangers; energy storage systems; phase change materials; enhancement techniques

Special Issue Information

Dear Colleagues,

Efficient heat and mass transfer is a fundamental requirement across a wide spectrum of engineering applications; including heat exchangers; power generation; renewable energy technologies; electronics cooling, refrigeration, and HVAC systems; and emerging fields like nanotechnology. In this context, the study of two-phase flow, in which heat and mass are transferred through the interaction of two distinct phases, such as liquid–vapor, solid–liquid or solid–gas, is essential for enhancing thermal process efficiency. The main challenges in studying these systems lie in understanding the intricate dynamics at the phase interfaces, managing the variability in flow regimes, and addressing issues related to heat transfer efficiency and pressure drops under varying operating conditions. In the absence of fluid flow, as in two-phase thermal energy storage systems (TESS), other aspects such as phase change kinetics, thermal conductivity limitations, and thermal stability play a critical role in influencing system performance. At the microscale, nanoscale, and macroscale levels, the thorough understanding of two-phase heat and mass transfer by means of both experimental and numerical techniques is pivotal for the optimization of next generation energy systems.

This Special Issue of Energies focuses on examining cutting-edge developments and frontier research in the rapidly evolving field of two-phase heat and mass transfer. By addressing both the theoretical foundations and practical implementations of these systems, this collection aims at offering valuable insights towards more efficient and sustainable energy solutions. We invite experts and researchers to delve into the latest experimental results, simulations, and designs that promise to push the boundaries of two-phase heat transfer in modern engineering and energy systems.

Topics of interest for the Special Issue include (but are not limited to):

  • Heat and mass transfer enhancement techniques;
  • Boiling, condensation, and evaporation;
  • Icing and frosting;
  • Droplet and bubble dynamics;
  • Phase change materials (PCMs) for thermal energy storage (TESS);
  • Two-phase flow at micro- and nanoscales;
  • Two-phase flow in heat exchangers;
  • Numerical methods and computational techniques for two-phase heat transfer analysis;
  • Multi-phase flow in renewable energy systems;
  • Energy systems and thermal management in electronics.

Dr. Arianna Berto
Dr. Marco Tancon
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. Energies is an international peer-reviewed open access semimonthly 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

  • multi-phase flow
  • two-phase heat and mass transfer
  • heat exchangers
  • energy storage systems
  • phase change materials
  • enhancement techniques

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Published Papers (2 papers)

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Research

23 pages, 3114 KiB  
Article
Heat Transfer Enhancement in Flue-Gas Systems with Radiation-Intensifying Inserts: An Analytical Approach
by Justina Menkeliūnienė, Rolandas Jonynas, Linas Paukštaitis, Algimantas Balčius and Kęstutis Buinevičius
Energies 2025, 18(13), 3383; https://doi.org/10.3390/en18133383 (registering DOI) - 27 Jun 2025
Abstract
A significant portion of energy losses in industrial systems arises from the inefficient use of high-temperature exhaust gases, emphasizing the need for enhanced heat recovery strategies. This study aims to improve energy efficiency by examining the effects of radiation-intensifying inserts on combined radiative [...] Read more.
A significant portion of energy losses in industrial systems arises from the inefficient use of high-temperature exhaust gases, emphasizing the need for enhanced heat recovery strategies. This study aims to improve energy efficiency by examining the effects of radiation-intensifying inserts on combined radiative and convective heat transfer in flue-gas heated channels. A systematic literature review revealed a research gap in understanding the interaction between these mechanisms in flue-gas heat exchangers. To address this, analytical calculations were conducted for two geometries: a radiation-intensifying plate between parallel plates and the same insert in a circular pipe. The analysis covered a range of gas-flue and wall temperatures (560–1460 K and 303–393 K, respectively), flow velocities, and spectral emissivity values. Key performance metrics included Reynolds and Nusselt numbers to assess flow resistance and heat transfer. Results indicated that flue-gas temperature has the most significant effect on total rate of heat transfer, and the insert significantly enhanced radiative heat transfer by over 60%, increasing flow resistance. A local Nusselt number minimum at a length-to-diameter ratio of approximately 26 suggested transitional flow behavior. These results provide valuable insights for the design of high-temperature heat exchangers, with future work planned to validate the findings experimentally. Full article
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21 pages, 3737 KiB  
Article
Melting in Shell-and-Tube and Shell-and-Coil Thermal Energy Storage: Analytical Correlation for Melting Fraction
by Michał Rogowski, Maciej Fabrykiewicz and Rafał Andrzejczyk
Energies 2025, 18(11), 2923; https://doi.org/10.3390/en18112923 - 3 Jun 2025
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Abstract
The following study investigated the melting behavior of coconut oil as a phase-change material in shell-and-tube and shell-and-coil thermal energy storage systems. The primary objective was to deepen the understanding of PCM melting dynamics under varying boundary conditions, aiming to optimize TES designs [...] Read more.
The following study investigated the melting behavior of coconut oil as a phase-change material in shell-and-tube and shell-and-coil thermal energy storage systems. The primary objective was to deepen the understanding of PCM melting dynamics under varying boundary conditions, aiming to optimize TES designs for renewable energy applications. This research addresses a gap in understanding how different heat-transfer configurations and boundary conditions affect melting efficiency. Experimental setups included two distinct heat-transfer surfaces in a cylindrical shell—a copper tube and a copper coil—tested under constant wall temperatures (34 °C for the tube, 33 °C for the coil) and constant heat flux (597 W/m2 for the coil). Findings reveal that melting under constant heat flux takes approximately twice as long as under constant wall temperatures, underscoring the critical role of heat-transfer conditions in TES performance. The liquid fraction was estimated using two approaches: image-based analysis and the volume-averaged temperature method. The former proved less reliable due to geometric limitations, particularly when the heat-transfer surface was distant from the shell wall. Conversely, the latter yielded higher accuracy, especially in the shell-and-tube setup. Due to the scarcity of correlations for constant heat-flux conditions, the novel contribution of this work is the development of a modified semi-empirical correlation for the shell-and-coil TES system. For this purpose, an existing model, which demonstrated strong alignment with experimental data, was adapted. The findings suggest that slower melting under constant heat flux could benefit applications needing sustained heat release, like solar energy systems. Future work could investigate additional PCMs or novel geometries to further improve TES efficiency and scalability. Full article
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