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Energies
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Recent Advancements in Thermal Fluid Engineering and Flow Device Systems
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Recent Advancements in Thermal Fluid Engineering and Flow Device Systems

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "J: Thermal Management".

Deadline for manuscript submissions: closed (18 July 2023) | Viewed by 3743

Special Issue Editors

Dr. Grzegorz Ligus

E-Mail Website
Guest Editor
Department of Process and Environmental Engineering, Faculty of Mechanical Engineering, Opole University of Technology, 45-758 Opole, Poland
Interests: experimental fluid mechanics; optical methods; flow visualisation; multiphase flow; heat exchangers; flow maldistribution
Special Issues, Collections and Topics in MDPI journals
Dr. Małgorzata Sikora

E-Mail Website
Guest Editor
Faculty of Mechanical Engineering, Department of Energy Engineering, Koszalin University of Technology, Koszalin, 75-453, Poland
Interests: condensation; two-phase flow structures; mini channels; heat transfer; pressure drops; heat pumps; air condensation; refrigeration; refrigerants; energetic audit
Special Issues, Collections and Topics in MDPI journals
Dr. Marek Wasilewski

E-Mail Website
Guest Editor
Faculty of Production Engineering and Logistics, Opole University of Technology, 76 Proszkowska St., 45-758 Opole, Poland
Interests: fluid mechanics; CFD; separation processes; turbulent flow; multiphase flow

Special Issue Information

Dear Colleagues,

Many sectors of industry are dependent on thermal fluids. It is difficult to imagine an industrial process carried out without the use of heat and a liquid or gas. In the fuel and energy sector, this seems to be downright impossible. Therefore, providing access to knowledge to guarantee the development of thermal fluid engineering and flow device systems brings increasing challenges to researchers. This situation raises the need for strong research development of many processes and devices for which fluid flow is the foundation of operation. All this underlies the decision to create this Special Issue. As the research area of thermal fluid engineering and flow device systems includes complex aspects, the topics of interest for publication include a fairly wide scope of research and review papers. Among others, one can mention:

  • Heat and mass transfer,
  • Thermal processes,
  • Single and multiphase flow,
  • Flow structures and patterns,
  • Condensation,
  • Refrigeration,
  • Turbulent flow,
  • Maldistribution of the fluids.

A special interest is directed toward fluid flow in renewable energy systems and energy storage technologies. The topics of study are not limited to the above issues if thermal fluids or flow device aspects are included.

This Special Issue aims to invite researchers and engineers from different fields of knowledge, using a variety of research tools and techniques and having different approaches, to solving research challenges, to publish their latest achievements in the subject matter.

If you can bring a fresh perspective to the research of thermal fluid engineering and flow device systems, you are particularly invited to submit to this issue.

Dr. Grzegorz Ligus
Dr. Małgorzata Sikora
Dr. Marek Wasilewski
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

  • thermal fluid
  • flow device
  • heat and mass transfer
  • heat exchanger
  • refrigeration
  • condensation
  • multiphase flow
  • phase transition
  • flow visualization
  • turbulent flow
  • droplets and particles
  • computational fluid dynamics
  • experimental fluid mechanics

Published Papers (3 papers)

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Research

18 pages, 4779 KiB  
Article
Maldistribution of a Thermal Fluid along the U-Tube with a Different Bending Radius—CFD and PIV Investigation
by Grzegorz Ligus and Barbara Wasilewska
Energies 2023, 16(15), 5716; https://doi.org/10.3390/en16155716 - 31 Jul 2023
Viewed by 743
Abstract
This paper investigates the effect of changing the bending radius of pipes on the maldistribution of velocity and turbulence of thermal fluid when flowing through a u-shaped tube bundle used in compact heat exchangers, among other applications. The study included three bending radii [...] Read more.
This paper investigates the effect of changing the bending radius of pipes on the maldistribution of velocity and turbulence of thermal fluid when flowing through a u-shaped tube bundle used in compact heat exchangers, among other applications. The study included three bending radii corresponding to successive rows of the actual tube bundle of a compact heat exchanger. Both liquid flow velocities recommended for compact heat exchangers and velocities elevated from the recommended ones were adopted. The results of the study were obtained by Computational Fluid Dynamics (CFD) and the performed experiment using the Particle Image Velocimetry (PIV) method. The limits of maldistribution were indicated by parameterizing this phenomenon with related geometric and flow values (turbulent flow intensity factor, flow velocity, pipe diameter, and bending radius). An increase in flow velocity above the recommended values did not result in a significant increase in turbulent flow intensity factor for u-tubes with large d/rg values. The shortest distance at which the return to steady-state flow conditions in a straight section of pipe downstream of an elbow took place was determined. This distance was 17d for geometry rg = 0.009 m, with velocity vp = 1.44 m/s. The localization of the areas of highest and lowest fluid velocity in the elbow element of the u-tube for extreme values of rg was opposite. This fact has an exploitable significance (non-uniform erosive effect of thermal fluid on pipes in different rows). Full article
(This article belongs to the Special Issue Recent Advancements in Thermal Fluid Engineering and Flow Device Systems)
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19 pages, 6672 KiB  
Article
Numerical Analysis of the Differential Flowmeter: Standard Orifice and Slotted Orifices
by Barbara Tomaszewska-Wach
Energies 2023, 16(14), 5573; https://doi.org/10.3390/en16145573 - 24 Jul 2023
Cited by 1 | Viewed by 1198
Abstract
The paper presents the results of simulation studies of fluid flow through a standard orifice and two slotted orifices. The research that has been carried out concerns the analysis of the effect of the orifice geometry on the velocity profiles, turbulence kinetic energy [...] Read more.
The paper presents the results of simulation studies of fluid flow through a standard orifice and two slotted orifices. The research that has been carried out concerns the analysis of the effect of the orifice geometry on the velocity profiles, turbulence kinetic energy and turbulence energy dispersion. The profile studies were conducted at different distances behind the orifice so that the results could be compared with each other. The studied flow included an airflow whose inlet velocity was 15 m/s. The turbulence model k-ε was used for numerical calculations. The tested orifices were characterized by an orifice constriction equal to β = 0.5. The calculations involved flow through a pipeline with a diameter of 160 mm. The results show that for a standard orifice, the maximum velocity of the flow is about 95 m/s and this is recorded at a distance of about 10–20 cm behind the orifice, and then it decreases, and at a distance of about 60 cm, the flow velocity is about 27 m/s. In the case of slotted holes, the maximum velocity is about 30% lower compared to the flow rate through a standard orifice design. The maximum velocity behind slotted orifices occurs directly behind the orifice, and in the cases of slotted orifice 1 and slotted orifice 2, was about 70 m/s and 67 m/s, respectively. For slotted orifice 1, at a distance of 20 cm behind the orifice, the flow assumed a velocity of about 19 m/s, whereas for slotted orifice 2, the flow reached a speed of about 18 m/s, at a distance of about 30 cm behind the orifice. The values of the maximum kinetic energy of turbulence for the tested orifices are about 420 m2/s2 for the standard orifice, and about 250 m2/s2 and 220 m2/s2 for slotted orifices 1 and 2, respectively. The obtained simulation results demonstrated that slotted orifices lead to faster stream homogenization and do not disturb the flow as much as a standard orifice. Slotted orifices exhibit a higher flow coefficient. Full article
(This article belongs to the Special Issue Recent Advancements in Thermal Fluid Engineering and Flow Device Systems)
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30 pages, 7670 KiB  
Article
Application of Response Surface Methodology and Artificial Neural Network to Optimize the Curved Trapezoidal Winglet Geometry for Enhancing the Performance of a Fin-and-Tube Heat Exchanger
by Rishikesh Sharma, Dipti Prasad Mishra, Marek Wasilewski and Lakhbir Singh Brar
Energies 2023, 16(10), 4209; https://doi.org/10.3390/en16104209 - 19 May 2023
Cited by 3 | Viewed by 1384
Abstract
The present work aims at optimizing the geometry of curved trapezoidal winglets to enhance heat transfer rates (expressed as Colburn factor, j) and minimize pressure losses (expressed as friction factor, f). A fin-and-tube heat exchanger was analyzed with winglets mounted on [...] Read more.
The present work aims at optimizing the geometry of curved trapezoidal winglets to enhance heat transfer rates (expressed as Colburn factor, j) and minimize pressure losses (expressed as friction factor, f). A fin-and-tube heat exchanger was analyzed with winglets mounted on the alternate tube and on either side of the fins. Multi-objective optimization was performed using the genetic algorithm (GA) to maximize j and minimize f. Two surrogate models, viz. response surface methodology (RSM) and artificial neural network (ANN), were considered as inputs to GA. To reduce the number of runs, a sensitivity analysis was first performed to select the most influential geometrical parameters for optimization. The values of j and f in the design of the experiments table were computed using CFD. The Pareto front points elucidated a significant improvement compared with the reference model along with a broad choice for the designers, not only for the design condition but also for the off-design inlet condition. Full article
(This article belongs to the Special Issue Recent Advancements in Thermal Fluid Engineering and Flow Device Systems)
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