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Energies
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Investigations of Heat Transfer with Estimation of Temperature Uncertainty Measurements
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Investigations of Heat Transfer with Estimation of Temperature Uncertainty Measurements

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

Deadline for manuscript submissions: 15 June 2024 | Viewed by 1910

Special Issue Editor

Prof. Dr. Magdalena Piasecka

E-Mail Website
Guest Editor
Faculty of Mechatronics and Mechanical Engineering, Kielce University of Technology, Al. Tysiaclecia Panstwa Polskiego 7, 25-314 Kielce, Poland
Interests: heat transfer; minichannels; minigaps; compact heat exchangers; two-phase flow; heat transfer enhancement; temperature measurement; computational methods for solving inverse heat transfer problems; thermal and production engineering; quality management tools
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Special Issue Information

Dear Colleagues,

The transfer of large heat fluxes is one of the most significant issues with modern technology. In recent years, the range of applications for heat transfer has broadened considerably, including new systems. Theoretical analyses, experimental measurements, and practical applications have been performed to help us understand heat and mass transfer phenomena. The results of these studies provide us with information about the design of cooling systems for cooling, thermostabilization, and thermoregulation. Moreover, it should be underlined that statistical data on temperature measurements are needed to ensure that heat transfer results based on experiments are reliable.

I invite you to submit an article to the Special Issue of Energies on the subject of “Investigations of heat transfer with estimation of temperature uncertainty measurements”.

Topics of interest include:

  • Heat and mass transfer problems also with change of phase;
  • Heat transfer enhancement;
  • Multiphase flow;
  • Unsteady flow and instabilities;
  • Methods for identifying two-phase flow structures;
  • Computational methods for solving heat and mass transfer problems;
  • Prediction of correlations between heat transfer and pressure drops;
  • Practical applications.

Original articles containing experimental research, case studies, theoretical analyses, computational methods, practical applications, or other discussions on heat and mass transfer, as well as temperature uncertainty measurements, are strongly encouraged.

Prof. Dr. Magdalena Piasecka
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. 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.

Published Papers (2 papers)

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Research

33 pages, 5099 KiB  
Article
Investigations of Flow Boiling in Mini-Channels: Heat Transfer Calculations with Temperature Uncertainty Analyses
by Magdalena Piasecka, Beata Maciejewska, Dariusz Michalski, Norbert Dadas and Artur Piasecki
Energies 2024, 17(4), 791; https://doi.org/10.3390/en17040791 - 06 Feb 2024
Viewed by 769
Abstract
The article aims to explore boiling heat transfer in mini-channels with a rectangular cross-section using various fluids (HFE-649, HFE-7000, HFE-7100, and HFE-7200). Temperature measurements were conducted using infrared thermography for the heated wall and K-type thermocouples for the working fluid. The 2D mathematical [...] Read more.
The article aims to explore boiling heat transfer in mini-channels with a rectangular cross-section using various fluids (HFE-649, HFE-7000, HFE-7100, and HFE-7200). Temperature measurements were conducted using infrared thermography for the heated wall and K-type thermocouples for the working fluid. The 2D mathematical model for heat transfer in the test section was proposed. Local heat transfer coefficients between the heated wall and the working fluid were determined from the Robin condition. The problem was solved by means of the finite element method (FEM) with Trefftz functions. The values of the heat transfer coefficient that were obtained were compared with the results calculated from Newton’s law of cooling. The average relative differences between the obtained results did not exceed 4%. The study included uncertainty analyses for temperature measurements with K- and T-type thermocouples. Expanded uncertainties were calculated using the uncertainty propagation and Monte Carlo methods. Precisely determining the uncertainties in contact temperature measurements is crucial to ensure accurate temperature data for subsequent heat transfer calculations. The results of the heat transfer investigations were compared in terms of fluid temperature, heat transfer coefficients, and boiling curves. HFE-7200 consistently exhibited the highest fluid temperature and temperature differences at boiling incipience, while HFE-7000 demonstrated the highest heat transfer coefficients. HFE-649 showed the lowest heat transfer coefficients. The boiling curves exhibited a typical shape, with a notable occurrence of ‘nucleation hysteresis phenomena’. Upon the analysis of two-phase flow patterns, bubbly and bubbly-slug structures were observed. Full article
(This article belongs to the Special Issue Investigations of Heat Transfer with Estimation of Temperature Uncertainty Measurements)
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19 pages, 4623 KiB  
Article
Pool Boiling of Ethanol on Copper Surfaces with Rectangular Microchannels
by Robert Kaniowski, Robert Pastuszko, Egidijus Dragašius and Saulius Baskutis
Energies 2023, 16(23), 7883; https://doi.org/10.3390/en16237883 - 02 Dec 2023
Viewed by 815
Abstract
In this paper, pool boiling of ethanol at atmospheric pressure was analyzed. The enhanced surfaces were made of copper, on which grooves with a depth ranging from 0.2 to 0.5 mm were milled in parallel. The widths of the microchannels and the distances [...] Read more.
In this paper, pool boiling of ethanol at atmospheric pressure was analyzed. The enhanced surfaces were made of copper, on which grooves with a depth ranging from 0.2 to 0.5 mm were milled in parallel. The widths of the microchannels and the distances between them were 0.2 mm, 0.3 mm and 0.4 mm, respectively. The highest heat transfer coefficient, 90.3 kW/m2K, was obtained for the surface with a microchannel depth of 0.5 mm and a width of 0.2 mm. The maximum heat flux was 1035 kW/m2. For the analyzed surfaces, the maximum heat flux increase of two and a half times was obtained, while the heat transfer coefficient increased three-fold in relation to the smooth surface. In the given range of heat flux 21.2–1035 kW/m2, the impact of geometric parameters on the heat transfer process was presented. The diameters of the departing bubbles were determined experimentally with the use of a high-speed camera. A simplified model was proposed to determine the diameter of the departure bubble for the studied surfaces. Full article
(This article belongs to the Special Issue Investigations of Heat Transfer with Estimation of Temperature Uncertainty Measurements)
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