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Energies
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Modeling and Analysis of Fluid Flow and Heat Transfer
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Modeling and Analysis of Fluid Flow and Heat Transfer

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

Deadline for manuscript submissions: closed (31 March 2024) | Viewed by 2895

Special Issue Editor

Prof. Dr. Bartlomiej Hernik

E-Mail Website
Guest Editor
Department of Power Engineering and Turbomachinery, Silesian University of Technology, Konarskiego 18, 44-100 Gliwice, Poland
Interests: combustion process; emission control; erosion; heat and mass transfer; numerical simulations; boilers and burners; coal; biomass; biogas; gasification; renewable energy

Special Issue Information

Dear Colleagues,

This Special Issue aims to showcase the latest research in fluid flow and heat transfer modeling. Fluid flow is considered both in boiler devices accompanied by combustion and heat exchange, as well as in heat exchangers and flow machines. In terms of the design and modernization of equipment, flow research is an essential point in the development of machinery and equipment. Heat transfer accompanies most of the phenomena occurring in the surrounding technical reality. Research on models and the use of modeling in the description of heat transfer issues are significant. The topics discussed include numerical, laboratory, and real in situ research.

Prof. Dr. Bartlomiej Hernik
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.

Keywords

  • numerical modeling
  • energy
  • flow
  • combustion
  • heat transfer
  • measurements
  • boilers
  • turbines
  • multi-phase flows

Published Papers (3 papers)

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Research

21 pages, 5993 KiB  
Article
Unlocking the Thermal Efficiency of Irregular Open-Cell Metal Foams: A Computational Exploration of Flow Dynamics and Heat Transfer Phenomena
by Qian Xu, Yunbing Wu, Ye Chen and Zhengwei Nie
Energies 2024, 17(6), 1305; https://doi.org/10.3390/en17061305 - 08 Mar 2024
Viewed by 392
Abstract
An open-cell metal foam has excellent characteristics such as low density, high porosity, high specific surface area, high thermal conductivity, and low mass due to its unique internal three-dimensional network structure. It has gradually become a new material for enhanced heat transfer in [...] Read more.
An open-cell metal foam has excellent characteristics such as low density, high porosity, high specific surface area, high thermal conductivity, and low mass due to its unique internal three-dimensional network structure. It has gradually become a new material for enhanced heat transfer in industrial equipment, new compact heat exchangers, microelectronic device cooling, etc. This research established a comprehensive three-dimensional structural model of open-cell metal foams utilizing Laguerre–Voronoi tessellations and employed computational fluid dynamics to investigate its flow dynamics and coupled heat transfer performance. By exploring the impact of foam microstructure on flow resistance and heat transfer characteristics, the study provided insights into the overall convective heat transfer performance across a range of foam configurations with varying pore densities and porosities. The findings revealed a direct correlation between convective heat transfer coefficient (h) and pressure drop (ΔP) with increasing Reynolds number (Re), accompanied by notable changes in fluid turbulence kinetic energy (e) and temperature (T), ultimately influencing heat transfer efficiency. Furthermore, the analysis demonstrated that alterations in porosity (ε) and pore density significantly affected unit pressure drop (ΔP/L) and convective heat transfer coefficient (h). This study identified an optimal configuration, highlighting a metal foam with a pore density of 20 PPI and a porosity of 95% as exhibiting superior overall convective heat transfer performance. Full article
(This article belongs to the Special Issue Modeling and Analysis of Fluid Flow and Heat Transfer)
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18 pages, 13853 KiB  
Article
Influence of the Shrinkage of the Inner Layer of Steel Tubes on Permissible Thermal Load
by Mateusz Zieliński, Piotr Koniorczyk and Zbigniew Surma
Energies 2024, 17(3), 702; https://doi.org/10.3390/en17030702 - 01 Feb 2024
Viewed by 464
Abstract
This paper presents the results of numerical simulations of heat transfer in a tube with a protective chromium layer on the inner surface made of steel, with different shrinkage temperatures. Shrinkage in the steel is an unfavorable phenomenon because it causes cracks in [...] Read more.
This paper presents the results of numerical simulations of heat transfer in a tube with a protective chromium layer on the inner surface made of steel, with different shrinkage temperatures. Shrinkage in the steel is an unfavorable phenomenon because it causes cracks in the chrome coating. The cracks contribute to the peeling of the protective material on the inner surface of the tube. Wear and damage to the chrome layer significantly shortens the tube’s service life. The influence of the type of steel with medium carbon content on heat transfer for a sequence of ten, thirty, and sixty heat impulses was examined. Simulations were carried out for two selected steels with clearly different shrinkage temperatures, i.e., 30HN2MFA and X37CrMoV5-1 (1.2343). In 30HN2MFA steel, the shrinkage effect occurred at a temperature of approx. 750 °C, while in X37CrMoV5-1 steel it occurred at a temperature of approx. 870 °C. In the computational model, 30 cross-sections of the three-meter-long tube were analyzed. A time-dependent heat transfer coefficient was calculated in each zone. Heat transfer simulations were carried out using COMSOL version 6.1 software. This paper shows that for X37CrMoV5-1 steel, the shrinkage temperature on the inner surface of the tube was reached after approx. 60 heat impulses, while for 30HN2MFA steel, it was reached after approx. 30. The greatest differences in the number of impulses occurred for a pipe with a 200 µm thick chrome layer. Full article
(This article belongs to the Special Issue Modeling and Analysis of Fluid Flow and Heat Transfer)
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14 pages, 1086 KiB  
Article
Modeling of Turbulent Convective Heat-Transfer Characteristics in a Concentric Annular Channel
by Longfei Chen, Huaibao Zhang, Liugang Li and Guangxue Wang
Energies 2023, 16(4), 1998; https://doi.org/10.3390/en16041998 - 17 Feb 2023
Viewed by 1405
Abstract
Turbulent convective heat-transfer characteristics in a concentric annular channel with both walls heated are theoretically modeled and numerically computed in this article. Generalized algebraic predictive models and equations for heating over a single wall are first reviewed by summarizing the well-known methods in [...] Read more.
Turbulent convective heat-transfer characteristics in a concentric annular channel with both walls heated are theoretically modeled and numerically computed in this article. Generalized algebraic predictive models and equations for heating over a single wall are first reviewed by summarizing the well-known methods in the literature. These methods are then scrutinized according to the most recent investigations such that new viewpoints and corrections are introduced accordingly. Moreover, the application of superposition in temperature is used in the current work instead of the Nusselt number as seen in the literature. The numerical integration method is applied to the generalized equations to obtain the solutions, which are found to be in decent agreement with the direct numerical simulation (DNS) data in the literature. The results in this work also indicate that the wall heat flux density ratio and the annular radius ratio are two key factors that have a great influence on the heat-transfer characteristics of the case with both walls heated. Full article
(This article belongs to the Special Issue Modeling and Analysis of Fluid Flow and Heat Transfer)
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