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Entropy Analysis in Nanofluids and Porous Media

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

Deadline for manuscript submissions: closed (28 February 2022) | Viewed by 8941

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Special Issue Editors

Prof. Dr. Abderrahmane Baïri

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Laboratoire de Thermique Interfaces Environnement (LTIE), Université de Paris, 92001 Paris, France
Interests: applied heat transfer; natural convection; nanofluid; porous media; experimentation; fluid dynamics; numerical modeling; interfaces; renewable energy; thermal characterization
Special Issues, Collections and Topics in MDPI journals

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
Special Issues, Collections and Topics in MDPI journals

Prof. Dr. Hakan F. Oztop

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Department of Mechanical Engineering, Technology Faculty, Fırat University, Elazig, Turkey
Interests: CFD; sustainable energy; solar energy; nanofluids; phase change materials; heat transfer enhancement; drying
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Nanofluids as “smart” heat transfer fluids can be widely used in different engineering systems for heat transfer enhancement because of their high heat transfer properties. For a technical analysis of the modern engineering systems, it is possible to scrutinize the entropy generation within the system and to define conditions allowing for minimizing this characteristic. Such a combination of entropy generation minimization as an approach for modern nanofluids systems allows for solving various technical challenges.

The use of porous media saturated with nanofluids has shown its effectiveness in improving heat transfer. It constitutes a promising method for the thermoregulation of assemblies, so research on these phenomena deserves to be deepened.

This Special Issue is an opportunity for extending the research fields of nanofluids and entropy generation analysis, as well as porous media, in various branches of fundamental and practical research. It is a good chance to collect original studies on the considered topic from numerical and/or experimental approaches in order to present useful guidelines for future research.

Prof. Dr. Abderrahmane Baïri
Prof. Dr. Mikhail Sheremet
Prof. Dr. Hakan Oztop
Guest Editors

Manuscript Submission Information

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Keywords

Entropy generation analysis
Nanofluids
Natural convection
Porous media
Thermal systems
Exergy analysis
Heat transfer
Engineering applications

Published Papers (5 papers)

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Research

28 pages, 13929 KiB

Open AccessArticle

Electroosmosis-Optimized Thermal Model for Peristaltic Transportation of Thermally Radiative Magnetized Liquid with Nonlinear Convection

by Yasir Akbar and Hammad Alotaibi

Entropy 2022, 24(4), 530; https://0-doi-org.brum.beds.ac.uk/10.3390/e24040530 - 10 Apr 2022

Cited by 9 | Viewed by 1481

Abstract

The present study addresses the heat transfer efficiency and entropy production of electrically conducting kerosene-based liquid led by the combined impact of electroosmosis and peristalsis mechanisms. Effects of nonlinear mixed convection heat transfer, temperature-dependent viscosity, radiative heat flux, electric and magnetic fields, porous medium, heat sink/source, viscous dissipation, and Joule heating are presented. The Debye–Huckel linearization approximation is employed in the electrohydrodynamic problem. Mathematical modeling is conducted within the limitations of δ << 1 and Re → 0. Coupled differential equations after implementing a lubrication approach are numerically solved. The essential characteristics of the production of entropy, the factors influencing it, and the characteristics of heat and fluid in relation to various physical parameters are graphically evaluated by assigning them a growing list of numeric values. This analysis reveals that heat transfer enhances by enhancing nonlinear convection and Joule heating parameters. The irreversibility analysis ensures that the minimization of entropy generation is observed when the parameters of viscosity and radiation are held under control. Fluid velocity can be regulated by adjusting the Helmholtz–Smoluchowski velocity and magnetic field strength. Full article

(This article belongs to the Special Issue Entropy Analysis in Nanofluids and Porous Media)

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12 pages, 5664 KiB

Open AccessArticle

Entropy Analysis of the Thermal Convection of Nanosuspension within a Chamber with a Heat-Conducting Solid Fin

by Xuan Hoang Khoa Le, Hakan F. Oztop, Fatih Selimefendigil and Mikhail A. Sheremet

Entropy 2022, 24(4), 523; https://0-doi-org.brum.beds.ac.uk/10.3390/e24040523 - 07 Apr 2022

Cited by 7 | Viewed by 1568

Abstract

Heat transport augmentation in closed chambers can be achieved using nanofluids and extended heat transfer surfaces. This research is devoted to the computational analysis of natural convection energy transport and entropy emission within a closed region, with isothermal vertical borders and a heat-conducting solid fin placed on the hot border. Horizontal walls were assumed to be adiabatic. Control relations written using non-primitive variables with experimentally based correlations for nanofluid properties were computed by the finite difference technique. The impacts of the fin size, fin position, and nanoadditive concentration on energy transfer performance and entropy production were studied. It was found that location of the long fin near the bottom wall allowed for the intensification of convective heat transfer within the chamber. Moreover, this position was characterized by high entropy generation. Therefore, the minimization of the entropy generation can define the optimal location of the heat-conducting fin using the obtained results. An addition of nanoparticles reduced the heat transfer strength and minimized the entropy generation. Full article

(This article belongs to the Special Issue Entropy Analysis in Nanofluids and Porous Media)

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12 pages, 776 KiB

Open AccessArticle

MHD Double-Diffusive Carreau Fluid Flow through a Porous Medium with Variable Thermal Conductivity and Suction/Injection

by Salman Zeb, Shafiq Ahmad, Muhammad Ibrahim and Tareq Saeed

Entropy 2022, 24(3), 377; https://0-doi-org.brum.beds.ac.uk/10.3390/e24030377 - 08 Mar 2022

Cited by 10 | Viewed by 1820

Abstract

In this article, we consider the effects of double diffusion on magnetohydrodynamics (MHD) Carreau fluid flow through a porous medium along a stretching sheet. Variable thermal conductivity and suction/injection parameter effects are also taken into the consideration. Similarity transformations are utilized to transform the equations governing the Carreau fluid flow model to dimensionless non-linear ordinary differential equations. Maple software is utilized for the numerical solution. These solutions are then presented through graphs. The velocity, concentration, temperature profile, skin friction coefficient, and the Nusselt and Sherwood numbers under the impact of different parameters are studied. The fluid flow is analyzed for both suction and injection cases. From the analysis carried out, it is observed that the velocity profile reduces by increasing the porosity parameter while it enhances both the temperature and concentration profile. The temperature field enhances with increasing the variable thermal conductivity and the Nusselt number exhibits opposite behavior. Full article

(This article belongs to the Special Issue Entropy Analysis in Nanofluids and Porous Media)

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13 pages, 3297 KiB

Open AccessFeature PaperEditor’s ChoiceArticle

Hybrid Nanofluids Flows Determined by a Permeable Power-Law Stretching/Shrinking Sheet Modulated by Orthogonal Surface Shear

by Natalia C. Roşca and Ioan Pop

Entropy 2021, 23(7), 813; https://0-doi-org.brum.beds.ac.uk/10.3390/e23070813 - 25 Jun 2021

Cited by 10 | Viewed by 1411

Abstract

The present paper studies the flow and heat transfer of the hybrid nanofluids flows induced by a permeable power-law stretching/shrinking surface modulated orthogonal surface shear. The governing partial differential equations were converted into non-linear ordinary differential equations by using proper similarity transformations. These equations were then solved applying a numerical technique, namely bvp4c solver in MATLAB. Results of the flow field, temperature distribution, reduced skin friction coefficient and reduced Nusselt number were deduced. It was found that increasing mass flux parameter slows down the velocity and, hence, decreases the temperature. Furthermore, on enlarging the stretching parameter, the velocity and temperature increases and decreases, respectively. In addition, that the radiation parameter can effectively control the thermal boundary layer. Finally, the temperature decreases when the values of the temperature parameter increases. We apply similarity transformation in order to transform the governing model into a system of ODEs (ordinary differential equations). Numerical solutions for particular values of involved parameters are in very good agreement with previous calculations. The most important and interesting result of this paper is that for both the cases of shrinking and stretching sheet flows exhibit dual solutions in some intervals of the shrinking and stretching parameter. In spite of numerous published papers on the flow and heat transfer over a permeable stretching/shrinking surface in nanofluids and hybrid nanofluids, none of the researchers studied the present problem. Therefore, we believe that the results of the present paper are new, and have many industrial applications. Full article

(This article belongs to the Special Issue Entropy Analysis in Nanofluids and Porous Media)

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18 pages, 2212 KiB

Open AccessArticle

Thermal Management and Modeling of Forced Convection and Entropy Generation in a Vented Cavity by Simultaneous Use of a Curved Porous Layer and Magnetic Field

by Fatih Selimefendigil and Hakan F. Öztop

Entropy 2021, 23(2), 152; https://0-doi-org.brum.beds.ac.uk/10.3390/e23020152 - 26 Jan 2021

Cited by 12 | Viewed by 1543

Abstract

The effects of using a partly curved porous layer on the thermal management and entropy generation features are studied in a ventilated cavity filled with hybrid nanofluid under the effects of inclined magnetic field by using finite volume method. This study is performed [...] Read more.

100 \leq Re \leq 1000

), magnetic field strength (

0 \leq Ha \leq 80

), permeability of porous region (

10^{- 4} \leq Da \leq 5 \times 10^{- 2}

), porous layer height (

0.15 H \leq t_{p} \leq 0.45 H

), porous layer position (

0.25 H \leq y_{p} \leq 0.45 H

), and curvature size (

0 \leq b \leq 0.3 H

). The magnetic field reduces the vortex size, while the average Nusselt number of hot walls increases for Ha number above 20 and highest enhancement is 47% for left vertical wall. The variation in the average Nu with permeability of the layer is about 12.5% and 21% for left and right vertical walls, respectively, while these amounts are 12.5% and 32.5% when the location of the porous layer changes. The entropy generation increases with Hartmann number above 20, while there is 22% increase in the entropy generation for the case at the highest magnetic field. The porous layer height reduced the entropy generation for domain above it and it give the highest contribution to the overall entropy generation. When location of the curved porous layer is varied, the highest variation of entropy generation is attained for the domain below it while the lowest value is obtained at