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Entropy
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Advances in Entropy and Computational Fluid Dynamics
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Advances in Entropy and Computational Fluid Dynamics

A special issue of Entropy (ISSN 1099-4300). This special issue belongs to the section "Thermodynamics".

Deadline for manuscript submissions: 14 June 2024 | Viewed by 3323

Special Issue Editors

Dr. Jorge Arturo Alfaro-Ayala

E-Mail Website
Guest Editor
Department of Chemical Engineering, University of Guanajuato, Guanajuato 36050, Mexico
Interests: fluid dynamics; heat transfer; fluid mechanics; applied thermodynamics; heat exchangers; CFD simulation
Dr. José de Jesús Ramírez-Minguela

E-Mail Website
Guest Editor
Department of Chemical Engineering, University of Guanajuato, Guanajuato 36050, Mexico
Interests: fluid dynamics; heat transfer; entropy; fuel cells; CFD simulation

Special Issue Information

Dear Colleagues,

Nowadays, computational fluid dynamics (CFD) has taken on great relevance in the study, design, and optimization of equipment, which is due to its great ability to simulate and model transport phenomena. CFD and the second law of thermodynamics help us to understand the phenomena involved in different kinds of devices, such as fuel cells, turbines and solar collectors, among others. Several studies have demonstrated the use of CFD and the second law of thermodynamics to improve industrial equipment, and CFD is even used in the field of science, such as in medicine to predict diseases. In other words, CFD is used to create virtual environments to help us improve our understanding of the real world.

This Special Issue, “Advances in Entropy and Computational Fluid Dynamics”, will showcase unpublished original papers focused on the analysis of irreversibility by computational fluid dynamics.

Dr. Jorge Arturo Alfaro-Ayala
Dr. José de Jesús Ramírez-Minguela
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. Entropy is an international peer-reviewed open access monthly 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

  • entropy and CFD in laminar and turbulent flows
  • entropy generation rate by fluid flow and heat/mass transfer processes
  • entropy generation rate in multiphase flows
  • entropy generation rate in chemically reactive flows
  • optimization with the second law of thermodynamics and CFD
  • entropy generation rate in biological and physiological flows
  • entropy generation rate in nano- and micro-fluid flows
  • entropy and CFD in thermal equipment, such as fuel cells, solar collectors, heat exchangers, combustors, ovens, refrigeration cabins, etc.
  • entropy and CFD in devices used to generate energy, such as horizontal/vertical wind turbines, gas/vapor turbines, etc.
  • entropy and CFD in other equipment, such as compressors, blowers, stirred tanks, etc.
  • entropy and CFD in biological tissues, such as aorta, veins, heart, etc.

Published Papers (3 papers)

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Research

27 pages, 8341 KiB  
Article
Impact of Moving Walls and Entropy Generation on Doubly Diffusive Mixed Convection of Casson Fluid in Two-Sided Driven Enclosure
by Sivanandam Sivasankaran, Marimuthu Bhuvaneswari and Abdullah K. Alzahrani
Entropy 2024, 26(3), 245; https://doi.org/10.3390/e26030245 - 10 Mar 2024
Viewed by 706
Abstract
In this study, numerical simulations are conducted with the goal of exploring the impact of the direction of the moving wall, solute and thermal transport, and entropy production on doubly diffusive convection in a chamber occupied by a Casson liquid. Wall movement has [...] Read more.
In this study, numerical simulations are conducted with the goal of exploring the impact of the direction of the moving wall, solute and thermal transport, and entropy production on doubly diffusive convection in a chamber occupied by a Casson liquid. Wall movement has a significant impact on convective flow, which, in turn, affects the rate of mass and heat transfer; this sparked our interest in conducting further analysis. The left and right (upright) walls are preserved with constant (but different) thermal and solutal distributions, while the horizontal boundaries are impermeable to mass transfer and insulated from heat transfer. Numerical solutions are acquired using the control volume technique. Outcomes under a variety of Casson fluid parameters, including Ri, Gr, buoyancy ratio, and direction of the moving wall(s), are explored, and the influences of entropy generation are comprehensively investigated. While the flow field consists of a single cell in case I, it is dual-cellular in case III for all values of the considered parameters. Comparing the three cases, the average heat and mass transport presented lower values in case III due to the movement of an isothermal (left) wall against the buoyant force, while these values are enhanced in case I. The obtained results are expected to be useful in thermal engineering, material, food, and chemical processing applications. Full article
(This article belongs to the Special Issue Advances in Entropy and Computational Fluid Dynamics)
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25 pages, 9499 KiB  
Article
Low-Engine-Order Forced Response Analysis of a Turbine Stage with Damaged Stator Vane
by Yun Zheng, Xiubo Jin and Hui Yang
Entropy 2024, 26(1), 4; https://doi.org/10.3390/e26010004 - 19 Dec 2023
Viewed by 872
Abstract
A damaged stator vane can disrupt the circumferential symmetry of the design flow for turbine assemblies, which can lead to a low-engine-order (LEO) forced response of rotor blades. To help engineers be able to better address sudden vane damage failures, this paper conducts [...] Read more.
A damaged stator vane can disrupt the circumferential symmetry of the design flow for turbine assemblies, which can lead to a low-engine-order (LEO) forced response of rotor blades. To help engineers be able to better address sudden vane damage failures, this paper conducts a mechanism analysis of the LEO forced response of rotor blades induced by a single damaged vane using an in-house computational fluid dynamic code (Hybrid Grid Aeroelasticity Environment). Firstly, it is found that the damaged vane introduces a family of LEO aerodynamic excitations with high amplitudes by full-annulus unsteady aeroelastic simulations of a single-stage turbine. In particular, the LEO forced response of the rotor blades excited by 3EO is 2.01 times higher than the resonance response excited by vane passing frequency, and the LEO resonance risk of the rotor blades is greatly increased. Then, by analyzing the flow characteristics of the wake and potential field of the stator row with a damaged vane, the localized high transient pressure in the notch cavity and the radial redistribution of the secondary vortex at the stator exit are the main sources of the low-order harmonic components in the flow field. Importantly, the interaction mechanisms in two regions with high LEO excitation amplitude on the rotor blade surface are revealed separately. Finally, an evaluation and comparison of a single damaged vane in terms of aerodynamic performance and LEO forced response was carried out. The results of this paper provide a good theoretical basis for engineers to effectively control the resonance response of rotor blades caused by a damaged stator vane in turbine design. Full article
(This article belongs to the Special Issue Advances in Entropy and Computational Fluid Dynamics)
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18 pages, 7445 KiB  
Article
Performance Comparison of Different Flat Plate Solar Collectors by Means of the Entropy Generation Rate Using Computational Fluid Dynamics
by J. J. Ramírez-Minguela, V. H. Rangel-Hernández, J. A. Alfaro-Ayala, F. Elizalde-Blancas, B. Ruiz-Camacho, O. A. López-Núñez and C. E. Alvarado-Rodríguez
Entropy 2023, 25(4), 621; https://doi.org/10.3390/e25040621 - 06 Apr 2023
Cited by 2 | Viewed by 1095
Abstract
In this work, a numerical analysis of three different flat plate solar collectors was conducted using their entropy generation rates. Specifically, the Computational Fluid Dynamics (CFD) technique was used to compare the detailed performance of conventional and zigzag tube geometries of flat plate [...] Read more.
In this work, a numerical analysis of three different flat plate solar collectors was conducted using their entropy generation rates. Specifically, the Computational Fluid Dynamics (CFD) technique was used to compare the detailed performance of conventional and zigzag tube geometries of flat plate solar collectors (FPCs) in terms of their entropy generation rates. The effects of fluid viscosity, heat transfer, and heat loss of the flat plate solar collectors were considered for the local and global entropy generation rate analyses. Variations on the inlet volumetric flow rate of the FPCs from 1.0 to 9.0 L/min were simulated under the average solar radiation for one year in the state of Guanajuato, Mexico. The results illustrate and discuss the temperatures, pressures, and global entropy generation rates for volumetric flow variations. The velocity, temperature, and pressure distributions and the maps of the local entropy generation rates inside the collectors are presented and analyzed for the case with a flow rate of 3.0 L/min. These results demonstrate that the zigzag geometries achieved higher outlet temperatures and greater entropy generation rates than the conventional geometry for all the volumetric flow rates considered. Full article
(This article belongs to the Special Issue Advances in Entropy and Computational Fluid Dynamics)
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