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Thermal Radiation and Entropy Analysis

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

Deadline for manuscript submissions: closed (31 December 2020) | Viewed by 20613

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Prof. Dr. Mikhail Sheremet

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Laboratory on Convective Heat and Mass Transfer and Department of Theoretical Mechanics, Tomsk State University, 36 Lenin Ave., 634050 Tomsk, Russia
Interests: heat and mass transfer; natural convection; porous media; phase change materials; computational fluid dynamics; heat transfer enhancement
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Special Issue Information

Dear Colleagues,

Nowadays, the development of modern engineering devices, including heat exchangers, chemical reactors, electronic devices, and others, demands a deeper understanding of the transport processes within these systems. One of the main transport processes is heat transfer. In addition, at high or moderate temperatures, thermal radiation can play an essential role. Therefore, the analysis of this transport mechanism of energy is very important and useful. From a practical and engineering point of view, the study of energy systems should include entropy generation analysis. It is well known that entropy, as a thermodynamic function, reflects a system’s operating status. At the same time, it is necessary to minimize the entropy generation of a system to improve its working effectiveness. The entropy generation minimization technique can be employed for the optimization of technical systems including heat exchangers, elements of nuclear and thermal power plants, ventilation and air-conditioning systems, and so on. This method for the analysis of technical systems takes into account the impacts of hydrodynamics, heat transfer, magnetic fields, porous insertions, and other factors affecting a system’s effectiveness and, irrespective of technical and economic studies, allows to evaluate the basic functionality of a system.

This Special Issue will be an opportunity for extending the research fields of thermal radiation and entropy generation analysis to all aspects of fundamental and practical research. It is a very good chance to collect original studies on the considered topic and present useful guidelines for future researches.

Prof. Dr. Mikhail Sheremet
Guest Editor

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Keywords

Entropy generation analysis
Radiative heat transfer
Convective heat and mass transfer
Porous media
Nanofluids
Heat exchangers
Engineering systems

Published Papers (7 papers)

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Research

16 pages, 2355 KiB

Open AccessArticle

Impacts of Uniform Magnetic Field and Internal Heated Vertical Plate on Ferrofluid Free Convection and Entropy Generation in a Square Chamber

by Chinnasamy Sivaraj, Vladimir E. Gubin, Aleksander S. Matveev and Mikhail A. Sheremet

Entropy 2021, 23(6), 709; https://0-doi-org.brum.beds.ac.uk/10.3390/e23060709 - 03 Jun 2021

Cited by 8 | Viewed by 1826

Abstract

The heat transfer enhancement and fluid flow control in engineering systems can be achieved by addition of ferric oxide nanoparticles of small concentration under magnetic impact. To increase the technical system life cycle, the entropy generation minimization technique can be employed. The present research deals with numerical simulation of magnetohydrodynamic thermal convection and entropy production in a ferrofluid chamber under the impact of an internal vertical hot sheet. The formulated governing equations have been worked out by the in-house program based on the finite volume technique. Influence of the Hartmann number, Lorentz force tilted angle, nanoadditives concentration, dimensionless temperature difference, and non-uniform heating parameter on circulation structures, temperature patterns, and entropy production has been scrutinized. It has been revealed that a transition from the isothermal plate to the non-uniformly warmed sheet illustrates a rise of the average entropy generation rate, while the average Nusselt number can be decreased weakly. A diminution of the mean entropy production strength can be achieved by an optimal selection of the Lorentz force tilted angle. Full article

(This article belongs to the Special Issue Thermal Radiation and Entropy Analysis)

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25 pages, 10245 KiB

Open AccessEditor’s ChoiceArticle

Investigation of Forced Convection Enhancement and Entropy Generation of Nanofluid Flow through a Corrugated Minichannel Filled with a Porous Media

by Ehsan Aminian, Hesam Moghadasi, Hamid Saffari and Amir Mirza Gheitaghy

Entropy 2020, 22(9), 1008; https://0-doi-org.brum.beds.ac.uk/10.3390/e22091008 - 09 Sep 2020

Cited by 17 | Viewed by 2701

Abstract

Corrugating channel wall is considered to be an efficient procedure for achieving improved heat transfer. Further enhancement can be obtained through the utilization of nanofluids and porous media with high thermal conductivity. This paper presents the effect of geometrical parameters for the determination of an appropriate configuration. Furthermore, the optimization of forced convective heat transfer and fluid/nanofluid flow through a sinusoidal wavy-channel inside a porous medium is performed through the optimization of entropy generation. The fluid flow in porous media is considered to be laminar and Darcy–Brinkman–Forchheimer model has been utilized. The obtained results were compared with the corresponding numerical data in order to ensure the accuracy and reliability of the numerical procedure. As a result, increasing the Darcy number leads to the increased portion of thermal entropy generation as well as the decreased portion of frictional entropy generation in all configurations. Moreover, configuration with wavelength of 10 mm, amplitude of 0.5 mm and phase shift of 60° was selected as an optimum geometry for further investigations on the addition of nanoparticles. Additionally, increasing trend of average Nusselt number and friction factor, besides the decreasing trend of performance evaluation criteria (PEC) index, were inferred by increasing the volume fraction of the nanofluid (Al₂O₃ and CuO). Full article

(This article belongs to the Special Issue Thermal Radiation and Entropy Analysis)

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17 pages, 8344 KiB

Open AccessArticle

Aspects of Chemical Entropy Generation in Flow of Casson Nanofluid between Radiative Stretching Disks

by Nargis Khan, Iram Riaz, Muhammad Sadiq Hashmi, Saed A. Musmar, Sami Ullah Khan, Zahra Abdelmalek and Iskander Tlili

Entropy 2020, 22(5), 495; https://0-doi-org.brum.beds.ac.uk/10.3390/e22050495 - 25 Apr 2020

Cited by 54 | Viewed by 2820

Abstract

The appropriate utilization of entropy generation may provoke dipping losses in the available energy of nanofluid flow. The effects of chemical entropy generation in axisymmetric flow of Casson nanofluid between radiative stretching disks in the presence of thermal radiation, chemical reaction, and heat absorption/generation features have been mathematically modeled and simulated via interaction of slip boundary conditions. Shooting method has been employed to numerically solve dimensionless form of the governing equations, including expressions referring to entropy generation. The impacts of the physical parameters on fluid velocity components, temperature and concentration profiles, and entropy generation number are presented. Simulation results revealed that axial component of velocity decreases with variation of Casson fluid parameter. A declining variation in Bejan number was noticed with increment of Casson fluid constant. Moreover, a progressive variation in Bejan number resulted due to the impact of Prandtl number and stretching ratio constant. Full article

(This article belongs to the Special Issue Thermal Radiation and Entropy Analysis)

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17 pages, 4122 KiB

Open AccessArticle

Radiative MHD Nanofluid Flow over a Moving Thin Needle with Entropy Generation in a Porous Medium with Dust Particles and Hall Current

by Iskander Tlili, Muhammad Ramzan, Seifedine Kadry, Hyun-Woo Kim and Yunyoung Nam

Entropy 2020, 22(3), 354; https://0-doi-org.brum.beds.ac.uk/10.3390/e22030354 - 18 Mar 2020

Cited by 36 | Viewed by 3438

Abstract

This paper investigated the behavior of the two-dimensional magnetohydrodynamics (MHD) nanofluid flow of water-based suspended carbon nanotubes (CNTs) with entropy generation and nonlinear thermal radiation in a Darcy–Forchheimer porous medium over a moving horizontal thin needle. The study also incorporated the effects of Hall current, magnetohydrodynamics, and viscous dissipation on dust particles. The said flow model was described using high order partial differential equations. An appropriate set of transformations was used to reduce the order of these equations. The reduced system was then solved by using a MATLAB tool bvp4c. The results obtained were compared with the existing literature, and excellent harmony was achieved in this regard. The results were presented using graphs and tables with coherent discussion. It was comprehended that Hall current parameter intensified the velocity profiles for both CNTs. Furthermore, it was perceived that the Bejan number boosted for higher values of Darcy–Forchheimer number. Full article

(This article belongs to the Special Issue Thermal Radiation and Entropy Analysis)

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17 pages, 4275 KiB

Open AccessArticle

Numerical Simulation on Convection and Thermal Radiation of Casson Fluid in an Enclosure with Entropy Generation

by A. K. Alzahrani, S. Sivasankaran and M. Bhuvaneswari

Entropy 2020, 22(2), 229; https://0-doi-org.brum.beds.ac.uk/10.3390/e22020229 - 18 Feb 2020

Cited by 19 | Viewed by 2524

Abstract

The goal of the current numerical simulation is to explore the impact of aspect ratio, thermal radiation, and entropy generation on buoyant induced convection in a rectangular box filled with Casson fluid. The vertical boundaries of the box are maintained with different constant thermal distribution. Thermal insulation is executed on horizontal boundaries. The solution is obtained by a finite volume-based iterative method. The results are explored over a range of radiation parameter, Casson fluid parameter, aspect ratio, and Grashof number. The impact of entropy generation is also examined in detail. Thermal stratification occurs for greater values of Casson liquid parameters in the presence of radiation. The kinetic energy grows on rising the values of Casson liquid and radiation parameters. The thermal energy transport declines on growing the values of radiation parameter and it enhances on rising the Casson fluid parameter. Full article

(This article belongs to the Special Issue Thermal Radiation and Entropy Analysis)

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20 pages, 3514 KiB

Open AccessArticle

Fluid Flow and Entropy Generation Analysis of Al₂O₃–Water Nanofluid in Microchannel Plate Fin Heat Sinks

by Hao Ma, Zhipeng Duan, Liangbin Su, Xiaoru Ning, Jiao Bai and Xianghui Lv

Entropy 2019, 21(8), 739; https://0-doi-org.brum.beds.ac.uk/10.3390/e21080739 - 28 Jul 2019

Cited by 18 | Viewed by 3491

Abstract

The flow in channels of microdevices is usually in the developing regime. Three-dimensional laminar flow characteristics of a nanofluid in microchannel plate fin heat sinks are investigated numerically in this paper. Deionized water and Al₂O₃–water nanofluid are employed as the cooling fluid in our work. The effects of the Reynolds number (100 < Re < 1000), channel aspect ratio (0 < ε < 1), and nanoparticle volume fraction (0.5% < Φ < 5%) on pressure drop and entropy generation in microchannel plate fin heat sinks are examined in detail. Herein, the general expression of the entropy generation rate considering entrance effects is developed. The results revealed that the frictional entropy generation and pressure drop increase as nanoparticle volume fraction and Reynolds number increase, while decrease as the channel aspect ratio increases. When the nanoparticle volume fraction increases from 0 to 3% at Re = 500, the pressure drop of microchannel plate fin heat sinks with ε = 0.5 increases by 9%. It is demonstrated that the effect of the entrance region is crucial for evaluating the performance of microchannel plate fin heat sinks. The study may shed some light on the design and optimization of microchannel heat sinks. Full article

(This article belongs to the Special Issue Thermal Radiation and Entropy Analysis)

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17 pages, 3245 KiB

Open AccessArticle

Entropy Analysis of Carbon Nanotubes Based Nanofluid Flow Past a Vertical Cone with Thermal Radiation

by Muhammad Ramzan, Mutaz Mohammad, Fares Howari and Jae Dong Chung

Entropy 2019, 21(7), 642; https://0-doi-org.brum.beds.ac.uk/10.3390/e21070642 - 28 Jun 2019

Cited by 30 | Viewed by 2901

Abstract

Our objective in the present study is to scrutinize the flow of aqueous based nanofluid comprising single and multi-walled carbon nanotubes (CNTs) past a vertical cone encapsulated in a permeable medium with solutal stratification. Moreover, the novelty of the problem is raised by the inclusion of the gyrotactic microorganisms effect combined with entropy generation, chemical reaction, and thermal radiation. The coupled differential equations are attained from the partial differential equations with the help of the similarity transformation technique. The set of conservation equations supported by the associated boundary conditions are solved numerically with the bvp4c MATLAB function. The influence of numerous parameters on the allied distributions is scrutinized, and the fallouts are portrayed graphically in the analysis. The physical quantities of interest including the skin friction coefficient and the rate of heat and mass transfers are evaluated versus essential parameters, and their outcomes are demonstrated in tabulated form. For both types of CNTs, it is witnessed that the velocity of the fluid is decreased for larger values of the magnetic and suction parameters. Moreover, the value of the skin friction coefficient drops versus the augmented bioconvection Rayleigh number. To corroborate the authenticity of the presented model, the obtained results (under some constraints) are compared with an already published paper, and excellent harmony is achieved in this regard. Full article

(This article belongs to the Special Issue Thermal Radiation and Entropy Analysis)

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