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Analysis of Thermal Performance of Passive Two-Phase Heat Transfer Systems

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Applied Thermal Engineering".

Deadline for manuscript submissions: 20 December 2025 | Viewed by 47

Special Issue Editors


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Guest Editor
Department of Thermodynamics and Renewable Energy Sources, Faculty of Mechanical and Power Engineering, Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland
Interests: pulsating heat pipe; multiphase flow; heat transfer; evaporation; condensation

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Guest Editor
Institute of Heat Engineering, Warsaw University of Technology, 00-665 Warsaw, Poland
Interests: heat and mass transfer; heat exchangers; refrigeration; air conditioning; heat pumps

Special Issue Information

Dear Colleagues,

Thermal management has become a critical factor in the development of modern high-performance systems, including microelectronics, aerospace technologies, and high-power industrial devices. Among various thermal control methods, passive two-phase heat transfer systems, such as heat pipes (HPs), loop heat pipes (LHPs), and pulsating heat pipes (PHPs), offer efficient, compact, and reliable solutions that do not require external power input.

In particular, pulsating heat pipes (PHPs), with their complex thermo-hydrodynamic behavior and high heat transport capabilities, are receiving increasing interest from scientific and engineering communities. Despite their advantages, their operation and performance remain strongly influenced by factors such as geometry, orientation, working fluid, and start-up characteristics, which continue to be active areas of research.

We are pleased to invite you to contribute to this Special Issue, which aims to provide a comprehensive overview of the latest advances in the thermal performance analysis, optimization, and applications of passive two-phase thermal control devices.

This Special Issue aims to

  • Highlight recent developments in the modeling, testing, and design of Heat Pipes, Pulsating Heat Pipes, and related systems.
  • Encourage multidisciplinary approaches combining thermodynamics, fluid mechanics, materials science, and applied engineering.
  • Promote practical case studies and emerging solutions for advanced thermal management. 

In this Special Issue, original research articles and reviews are welcome. Research areas may include (but are not limited to) the following:

  • Design, modeling, and experimental analysis of heat pipes, loop heat pipes, and pulsating heat pipes.
  • Optimization of thermal resistance and operational stability.
  • Start-up dynamics, flow regimes, and performance under variable orientations.
  • Novel working fluids and environmentally friendly alternatives.
  • Integration of heat pipes in space systems, electronics cooling, and energy harvesting.
  • Advances in diagnostics and visualization techniques for two-phase flow.
  • Comparative studies and performance benchmarking.
  • Miniaturized and flexible heat pipe technologies.
  • AI-based control and optimization of thermal management systems.

Dr. Cezary Czajkowski
Prof. Dr. Artur Rusowicz
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. Applied Sciences 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 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

  • pulsating heat pipe
  • multiphase flow
  • heat transfer
  • passive heat exchanger
  • heat pipe

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Published Papers (1 paper)

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Research

22 pages, 4469 KiB  
Article
Thermal and Exergetic Performance Analyses of a Heat Pipe Heat Exchanger Using CMC/Co3O4-Based Non-Newtonian Nanofluids
by Duygu Yilmaz Aydin
Appl. Sci. 2025, 15(14), 7831; https://doi.org/10.3390/app15147831 (registering DOI) - 12 Jul 2025
Abstract
This study presents an experimental evaluation of the thermal and exergetic performance of an air-to-air heat pipe heat exchanger using a cobalt oxide (Co3O4)-based non-Newtonian nanofluid, with the additional incorporation of carbon black (CB). Nanofluids were synthesized via a [...] Read more.
This study presents an experimental evaluation of the thermal and exergetic performance of an air-to-air heat pipe heat exchanger using a cobalt oxide (Co3O4)-based non-Newtonian nanofluid, with the additional incorporation of carbon black (CB). Nanofluids were synthesized via a two-step method and tested under turbulent flow conditions across varying Reynolds numbers. The results demonstrated that increasing the Co3O4 nanoparticle concentration and adding CB substantially improved both the thermal and exergetic performance compared to deionized water. Specifically, maximum thermal efficiency improvements of 62.7% and 75.4% were recorded for nanofluids containing 1% and 2% Co3O4, respectively. The addition of CB further enhanced the thermal efficiency, achieving a maximum improvement of 79.2%. Furthermore, the maximum reduction in thermal resistance reached 61.4% with CB incorporation, while the 2% Co3O4 nanofluid achieved a maximum decrease of 50.2%. The use of nanofluids led to a significant reduction in exergy loss, with exergy-saving efficiencies reaching up to 33.6%. These findings highlight the considerable potential of Co3O4- and CB-based hybrid nanofluids in advancing waste heat recovery technologies and enhancing the thermodynamic performance of air-to-air heat pipe heat exchanger systems. Full article
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