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Smart Materials and Devices in Heat and Mass Transfer
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Smart Materials and Devices in Heat and Mass Transfer

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Energy Materials".

Deadline for manuscript submissions: 20 March 2025 | Viewed by 1022

Special Issue Editors

Prof. Dr. Tadeusz Bohdal

E-Mail Website
Guest Editor
Faculty of Mechanical Engineering, Koszalin University of Technology, Raclawicka 15-17 Street, 75-620 Koszalin, Poland
Interests: heat transfer; heat exchangers; two-phase flows; boiling; condensation; minichannels
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Marcin Kruzel

E-Mail Website
Guest Editor
Faculty of Mechanical Engineering, Koszalin University of Technology, 75-620 Koszalin, Poland
Interests: heat transfer; heat exchangers; phase-change materials; 3D printing; TPMS
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

We are pleased to announce a new Special Issue in Materials titled “Smart Materials and Devices in Heat and Mass Transfer”. The use of intelligent manufacturing technologies is the future of industry. The constantly growing demand for energy forces designers of energy devices to use more innovative solutions, both in terms of material properties and geometry. These needs are met by broadly understood innovative materials that increase the performance of energy machines, i.e., heat exchangers, while reducing their weight. Smart materials also include future-proof Latent Functional Thermal Fluids, i.e., working fluids based on phase-change materials, which are useful wherever there is a need to receive high-density heat fluxes. Phase-change materials used in many branches of the global economy are also the subject of interest in this Special Issue. This Special Issue is devoted to but not limited to the following topics:

  • phase-change materials
  • microencapsulation
  • heat exchangers
  • phase transitions (also boiling and condensation)
  • 3D printing
  • triply periodic minimal surface
  • latent functional thermal fluids
  • thermal storage
  • energy efficiency.

Prof. Dr. Tadeusz Bohdal
Prof. Dr. Marcin Kruzel
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. Materials 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

  • TPMS
  • LFTF
  • thermal storage
  • heat exchangers
  • microencapsulation

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Published Papers (1 paper)

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Research

14 pages, 2016 KiB  
Article
Transition Boundary from Laminar to Turbulent Flow of Microencapsulated Phase Change Material Slurry—Experimental Results
by Krzysztof Dutkowski, Marcin Kruzel and Martyna Kochanowska
Materials 2024, 17(24), 6041; https://doi.org/10.3390/ma17246041 - 10 Dec 2024
Viewed by 383
Abstract
An ice slurry or an emulsion of a phase change material (PCM) is a multiphase working fluid from the so-called Latent Functional Thermal Fluid (LFTF) group. LFTF is a fluid that uses, in addition to specific heat, the specific enthalpy of the phase [...] Read more.
An ice slurry or an emulsion of a phase change material (PCM) is a multiphase working fluid from the so-called Latent Functional Thermal Fluid (LFTF) group. LFTF is a fluid that uses, in addition to specific heat, the specific enthalpy of the phase change of its components to transfer heat. Another fluid type has joined the LFTF group: a slurry of encapsulated phase change material (PCM). Technological progress has made it possible for the phase change material to be enclosed in a capsule of the size of the order of micrometers (microencapsulated PCM—mPCM) or nanometers (nanoencapsulated PCM—nPCM). This paper describes a method for determining the Reynolds number (Re) at which the nature of the flow of the mPCM slurry inside a straight pipe changes. In addition, the study results of the effect of the concentration of mPCM in the slurry and the state of the PCM inside the microcapsule on the value of the critical Reynolds number (Recr) are presented. The aqueous slurry of mPCM with a concentration from 4.30% to 17.20% wt. flowed through a channel with an internal diameter of d = 4 mm with a flow rate of up to 110 kg/h (Re = 11,250). The main peak melting temperature of the microencapsulated paraffin wax used in the experiments was around 24 °C. The slurry temperature during the tests was maintained at a constant level. It was 7 °C, 24 °C and 44 °C (the PCM in the microcapsule was, respectively, a solid, underwent a phase change and was a liquid). The experimental studies clearly show that the concentration of microcapsules in the slurry and the state of the PCM in the microcapsule affect the critical Reynolds number. The higher the concentration of microcapsules in the slurry, the more difficult it was to maintain laminar fluid flow inside the channel. Furthermore, the laminar flow of the slurry terminated at a lower critical Reynolds number when the PCM in the microcapsule was solid. Caution is advised when choosing the relationship to calculate the flow resistance or heat transfer coefficients, because assuming that the flow motion changes at Re = 2300, as in the case of pure liquids, may be an incorrect assumption. Full article
(This article belongs to the Special Issue Smart Materials and Devices in Heat and Mass Transfer)
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