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Energies
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Advanced Simulation of Turbulent Flows and Heat Transfer
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Advanced Simulation of Turbulent Flows 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: 31 December 2024 | Viewed by 2478

Special Issue Editors

Dr. Yasser Mahmoudi Larimi

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Guest Editor
Department of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester M13 PL, UK
Interests: turbulent flow and heat transfer; energy storage; compressors for hydrogen/air storage; aeroacoustics and hydrogen combustion
Dr. Mohammad Jadidi

E-Mail Website
Guest Editor
Department of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester M13 PL, UK
Interests: turbulent flows; heat transfer
Dr. Hongbing Ding

E-Mail Website
Guest Editor
School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
Interests: multiphase flow and heat transfer in energy systems
Dr. Mohammadhadi Hajilou

E-Mail Website
Guest Editor
Shiley School of Engineering, University of Portland, 5000 N. Willamette Blvd., Portland, OR 97203-5798, USA
Interests: utilization of combustion for clean energy generation; fire safety and emissions; carbon capture and recycling

Special Issue Information

Dear Colleagues,

Turbulent flows and heat transfer are intricate phenomena that play a pivotal role in various industrial applications, ranging from aerospace and automotive engineering to energy production and environmental engineering. Accurately modeling and simulating these processes is crucial for ensuring system efficiency, safety, and sustainability. This Special Issue, ‘Advanced Simulation of Turbulent Flows and Heat Transfer’ aims to present and disseminate the latest advancements in this crucial field by inviting researchers and engineers from across the globe to showcase their cutting-edge research, innovative methodologies, and groundbreaking discoveries.

We particularly encourage submissions that utilize artificial intelligence and machine learning in turbulent heat transfer and advanced computational methods, including large eddy simulation (LES), direct numerical simulation (DNS), Reynolds-averaged Navier–Stokes (RANS) models, and hybrid approaches. Topics of interest include, but are not limited to, the following:

  • Numerical modeling, with an emphasis on contributions that enhance the fundamental understanding of turbulent heat transfer processes and their application to engineering problems;
  • Application of artificial intelligence and machine learning in turbulent heat transfer;
  • Turbulent heat transfer in multiphase and porous flows;
  • Flow and heat transfer in biological systems;
  • Instrumentation and novel fluid measurement techniques;
  • Renewable energy;
  • Energy storage systems;
  • Cooling techniques;
  • Combustion, fire, and fuels;
  • Heat pipes and heat pumps;
  • Modeling of environmental flows in natural and built environments;
  • Applications of nano and micro fluids;
  • High-fidelity simulation.

We look forward to receiving your original research papers, empirical studies, or theoretical analyses.

Dr. Yasser Mahmoudi Larimi
Dr. Mohammad Jadidi
Dr. Hongbing Ding
Dr. Mohammadhadi Hajilou
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

  • free/forced convection
  • conjugate heat transfer
  • phase change materials
  • instability and heat transfer
  • environmental applications of heat transfer
  • energy engineering
  • heat transfer enhancement

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Published Papers (3 papers)

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Research

16 pages, 2285 KiB  
Article
Numerical Investigations on the Enhancement of Convective Heat Transfer in Fast-Firing Brick Kilns
by Julian Unterluggauer, Manuel Schieder, Stefan Gutschka, Stefan Puskas, Stefan Vogt and Bernhard Streibl
Energies 2024, 17(22), 5617; https://doi.org/10.3390/en17225617 - 10 Nov 2024
Viewed by 468
Abstract
In order to reduce CO2 emissions in the brick manufacturing process, the effectiveness of the energy-intensive firing process needs to be improved. This can be achieved by enhancing the heat transfer in order to reduce firing times. As a result, current development [...] Read more.
In order to reduce CO2 emissions in the brick manufacturing process, the effectiveness of the energy-intensive firing process needs to be improved. This can be achieved by enhancing the heat transfer in order to reduce firing times. As a result, current development of tunnel kilns is oriented toward fast firing as a long-term goal. However, a struggling building sector and complicated challenges, such as different requirements for product quality, have impeded developments in this direction. This creates potential for the further development of oven designs, such as improved airflow through the kiln. In this article, numerical flow simulations are used to investigate two different reconstruction measures and compare them to the initial setup. In the first measure, the kiln height is reduced, while in the second measure, the kiln cars are adjusted to alternate the height of the bricks so that every other pair of bricks is elevated, creating a staggered arrangement. Both measures are investigated to determine the effect on the heating rate compared to the initial configuration. A transient grid independence study is performed, ensuring numerical convergence and the setup is validated by experimental results from measurements on the initial kiln configuration. The simulations show that lowering the kiln height improves the heat transfer rate by 40%, while the staggered arrangement of the bricks triples it. This leads to an average brick temperature after two hours which is around 130 °C higher compared to the initial kiln configuration. Therefore, the firing time can be significantly reduced. However, the average pressure loss coefficient rises by 70% to 90%, respectively, in the staggered configuration. Full article
(This article belongs to the Special Issue Advanced Simulation of Turbulent Flows and Heat Transfer)
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26 pages, 22687 KiB  
Article
Numerical Investigation on the Effects of Gap Circulating Flow on Blower Performance under Design and Off-Design Conditions
by Xu Zhang, Yuxiang Gong, Xiaochang Chen, Liang Hu, Haibo Xie and Huayong Yang
Energies 2024, 17(15), 3617; https://doi.org/10.3390/en17153617 - 23 Jul 2024
Viewed by 641
Abstract
Blowers are widely used in tasks such as ventilation, exhaust, drying, cooling, heat dissipation, or conveying medium, and they usually consume a lot of energy. There is an inevitable gap between the rotating impeller and static volute casing due to manufacturing tolerance and [...] Read more.
Blowers are widely used in tasks such as ventilation, exhaust, drying, cooling, heat dissipation, or conveying medium, and they usually consume a lot of energy. There is an inevitable gap between the rotating impeller and static volute casing due to manufacturing tolerance and thermal deformation. The circulating flow in the gap has an important effect on the performance of the blower. In this study, computational fluid dynamics (CFD) was used to investigate the performance of the blower under different flow conditions and gaps, and the accuracy of the numerical simulation was verified by performance experiments. The results show that the flow separation under low flow conditions in the impeller channel can be suppressed by the circulating flow. However, the efficiency of the blower is decreased because a part of the power is used to maintain the circulating flow. Under design conditions, efficiency is reduced by 5.3~8.2%, depending on the gap sizes. Due to the increased flow rate in the impeller channel caused by the gap circulating flow, the net flow rate of the impeller under design conditions is about 12% higher than the inlet flow rate of the blower. Therefore, it leads to an increase of about 12% in impeller efficiency calculated by the net flow rate compared with the inlet flow rate. Finally, the flow field distribution on the impeller channel under different gap conditions was compared, and the effects of the gap on the blower performance were analyzed from the perspective of flow field structure. Full article
(This article belongs to the Special Issue Advanced Simulation of Turbulent Flows and Heat Transfer)
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18 pages, 8604 KiB  
Article
Numerical Investigation of Thermo-Flow Characteristics of Tubes with Transverse Micro-Fins
by Piotr Bogusław Jasiński
Energies 2024, 17(3), 714; https://doi.org/10.3390/en17030714 - 2 Feb 2024
Viewed by 921
Abstract
The article presents the results of numerical studies of heat transfer and pressure drops in a channel with transverse micro-fins. The main aim of the study was to prepare the thermal and flow characteristics of such a channel for a variable longitudinal spacing [...] Read more.
The article presents the results of numerical studies of heat transfer and pressure drops in a channel with transverse micro-fins. The main aim of the study was to prepare the thermal and flow characteristics of such a channel for a variable longitudinal spacing of micro-fins. For the tested pipe with an internal diameter of D = 12 mm, the absolute height of the micro-fins was e = 0.243 mm, which is 2% of its diameter. The tests were carried out for turbulent flow in the range of Reynolds numbers of 5000–250,000 with the variable spacing of micro-ribs in the range of L = 0.28–13.52 mm, which corresponds to their dimensionless longitudinal distance, L/D = 0.023–1.126. For the studied geometries, the characteristics of the friction factor, ft(Re), and the Nusselt number, Nu(Re), are shown in the graphs. The highest values of Nu were observed for a spacing of L/D = 0.092 in the range of Re = 5000–60,000, while the lowest were observed for a geometry of L/D = 0.035 for Re = 60,000–250,000. The friction factors, however, were the highest for the two geometries L/D = 0.161 and L/D = 0.229 over the entire range of the tested Re numbers. A large discrepancy was observed between the friction factors calculated from the Colebrook–White equation (for irregular relative roughness depicted in the Moody diagram) and those obtained from simulations (for pipes with the same roughness height but regular geometry created by micro-fins). An analysis of the heat transfer efficiency of the tested geometries was also presented, taking into account the criterion of equal pumping power, i.e., the PEC (performance evaluation criteria) coefficient. The highest values of the PEC coefficient, up to 1.25–1.28, were obtained for micro-fin spacings of L/D = 0.069 and L/D = 0.092 in the Re number range of 20.000–30.000. Full article
(This article belongs to the Special Issue Advanced Simulation of Turbulent Flows and Heat Transfer)
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