Special Issue "Entropy Generation in Nanofluid Flows"

A special issue of Entropy (ISSN 1099-4300).

Deadline for manuscript submissions: closed (31 August 2017).

Special Issue Editors

Prof. Dr. Giulio Lorenzini
Website
Guest Editor
Department of Industrial Engineering, University of Parma, Italy
Interests: engineering design; construction law; heat transfer optimization; advances in nanofluids
Special Issues and Collections in MDPI journals
Dr. Omid Mahian
Website
Guest Editor
School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, China
Interests: engineering design; constructal law; heat transfer optimization; advances in nanofluids.
Special Issues and Collections in MDPI journals

Special Issue Information

Dear Colleagues,

Nanofluids have been a hot topic of research in the past decade. They are mixtures of common liquids, such as water and oil, with ultra-fine particles (1–100 nm). Many studies have been done on the thermophysical properties of nanofluids, as well as their applications in heat transfer systems, since 1995. However, the first research projects on entropy generation due to nanofluid flow started from 2010. The aim of this Special Issue is to encourage the scholars to present their latest original studies on entropy generation and exergy analysis of thermal engineering systems in which a nanofluid is the working fluid. The analysis of entropy generation in nanofluid systems could be based on numerical simulations or experimental data. Submitted manuscripts may deal with the entropy generation in simple or complex geometries filled with nanofluids. In addition, the papers on the exergy analysis and entropy generation in various systems, such as renewable energy devices and heat exchangers with different sizes (from micro to conventional) are welcome. Researchers can focus on the effects of material type, volume fraction, size, and shape of nanoparticles, as well as the base fluid type on entropy generation and exergy analysis. The other field of interest could be the effects of uncertainties in thermophysical models of nanofluids on the entropy generation magnitude in new thermal engineering systems.

Prof. Dr. Giulio Lorenzini
Dr. Omid Mahian
Guest Editors

Manuscript Submission Information

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Keywords

  • entropy generation due to nanofluid flow in solar energy systems
  • entropy generation in microchannels using nanofluids
  • entropy generation in different shapes of cavities filled with nanofluid
  • irreversibility due to nanofluid flow over the free surfaces
  • entropy generation in heat exchangers
  • MHD flow and entropy generation
  • exergy analysis in nanofluid systems
  • different models for nanofluid flow modeling and their effect on entropy generation

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Published Papers (7 papers)

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Research

Open AccessArticle
Analysis of Entropy Generation in Flow of Methanol-Based Nanofluid in a Sinusoidal Wavy Channel
Entropy 2017, 19(10), 490; https://doi.org/10.3390/e19100490 - 08 Oct 2017
Cited by 27
Abstract
The entropy generation due to heat transfer and fluid friction in mixed convective peristaltic flow of methanol-Al2O3 nano fluid is examined. Maxwell’s thermal conductivity model is used in analysis. Velocity and temperature profiles are utilized in the computation of the [...] Read more.
The entropy generation due to heat transfer and fluid friction in mixed convective peristaltic flow of methanol-Al2O3 nano fluid is examined. Maxwell’s thermal conductivity model is used in analysis. Velocity and temperature profiles are utilized in the computation of the entropy generation number. The effects of involved physical parameters on velocity, temperature, entropy generation number, and Bejan number are discussed and explained graphically. Full article
(This article belongs to the Special Issue Entropy Generation in Nanofluid Flows)
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Open AccessArticle
Entropy Analysis on Electro-Kinetically Modulated Peristaltic Propulsion of Magnetized Nanofluid Flow through a Microchannel
Entropy 2017, 19(9), 481; https://doi.org/10.3390/e19090481 - 09 Sep 2017
Cited by 44
Abstract
A theoretical and a mathematical model is presented to determine the entropy generation on electro-kinetically modulated peristaltic propulsion on the magnetized nanofluid flow through a microchannel with joule heating. The mathematical modeling is based on the energy, momentum, continuity, and entropy equation in [...] Read more.
A theoretical and a mathematical model is presented to determine the entropy generation on electro-kinetically modulated peristaltic propulsion on the magnetized nanofluid flow through a microchannel with joule heating. The mathematical modeling is based on the energy, momentum, continuity, and entropy equation in the Cartesian coordinate system. The effects of viscous dissipation, heat absorption, magnetic field, and electrokinetic body force are also taken into account. The electric field terms are helpful to model the electrical potential terms by means of Poisson–Boltzmann equations, ionic Nernst–Planck equation, and Debye length approximation. A perturbation method has been applied to solve the coupled nonlinear partial differential equations and a series solution is obtained up to second order. The physical behavior of all the governing parameters is discussed for pressure rise, velocity profile, entropy profile, and temperature profile. Full article
(This article belongs to the Special Issue Entropy Generation in Nanofluid Flows)
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Open AccessArticle
Effect of Slip Conditions and Entropy Generation Analysis with an Effective Prandtl Number Model on a Nanofluid Flow through a Stretching Sheet
Entropy 2017, 19(8), 414; https://doi.org/10.3390/e19080414 - 11 Aug 2017
Cited by 10
Abstract
This article describes the impact of slip conditions on nanofluid flow through a stretching sheet. Nanofluids are very helpful to enhance the convective heat transfer in a boundary layer flow. Prandtl number also play a major role in controlling the thermal and momentum [...] Read more.
This article describes the impact of slip conditions on nanofluid flow through a stretching sheet. Nanofluids are very helpful to enhance the convective heat transfer in a boundary layer flow. Prandtl number also play a major role in controlling the thermal and momentum boundary layers. For this purpose, we have considered a model for effective Prandtl number which is borrowed by means of experimental analysis on a nano boundary layer, steady, two-dimensional incompressible flow through a stretching sheet. We have considered γAl2O3-H2O and Al2O3-C2H6O2 nanoparticles for the governing flow problem. An entropy generation analysis is also presented with the help of the second law of thermodynamics. A numerical technique known as Successive Taylor Series Linearization Method (STSLM) is used to solve the obtained governing nonlinear boundary layer equations. The numerical and graphical results are discussed for two cases i.e., (i) effective Prandtl number and (ii) without effective Prandtl number. From graphical results, it is observed that the velocity profile and temperature profile increases in the absence of effective Prandtl number while both expressions become larger in the presence of Prandtl number. Further, numerical comparison has been presented with previously published results to validate the current methodology and results. Full article
(This article belongs to the Special Issue Entropy Generation in Nanofluid Flows)
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Open AccessArticle
Investigation of Oriented Magnetic Field Effects on Entropy Generation in an Inclined Channel Filled with Ferrofluids
Entropy 2017, 19(7), 377; https://doi.org/10.3390/e19070377 - 23 Jul 2017
Cited by 9
Abstract
Dispersion of super-paramagnetic nanoparticles in nonmagnetic carrier fluids, known as ferrofluids, offers the advantages of tunable thermo-physical properties and eliminate the need for moving parts to induce flow. This study investigates ferrofluid flow characteristics in an inclined channel under inclined magnetic field and [...] Read more.
Dispersion of super-paramagnetic nanoparticles in nonmagnetic carrier fluids, known as ferrofluids, offers the advantages of tunable thermo-physical properties and eliminate the need for moving parts to induce flow. This study investigates ferrofluid flow characteristics in an inclined channel under inclined magnetic field and constant pressure gradient. The ferrofluid considered in this work is comprised of Cu particles as the nanoparticles and water as the base fluid. The governing differential equations including viscous dissipation are non-dimensionalised and discretized with Generalized Differential Quadrature Method. The resulting algebraic set of equations are solved via Newton-Raphson Method. The work done here contributes to the literature by searching the effects of magnetic field angle and channel inclination separately on the entropy generation of the ferrofluid filled inclined channel system in order to achieve best design parameter values so called entropy generation minimization is implemented. Furthermore, the effect of magnetic field, inclination angle of the channel and volume fraction of nanoparticles on velocity and temperature profiles are examined and represented by figures to give a thorough understanding of the system behavior. Full article
(This article belongs to the Special Issue Entropy Generation in Nanofluid Flows)
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Open AccessArticle
On Unsteady Three-Dimensional Axisymmetric MHD Nanofluid Flow with Entropy Generation and Thermo-Diffusion Effects on a Non-Linear Stretching Sheet
Entropy 2017, 19(7), 168; https://doi.org/10.3390/e19070168 - 12 Jul 2017
Cited by 10
Abstract
The entropy generation in unsteady three-dimensional axisymmetric magnetohydrodynamics (MHD) nanofluid flow over a non-linearly stretching sheet is investigated. The flow is subject to thermal radiation and a chemical reaction. The conservation equations are solved using the spectral quasi-linearization method. The novelty of the [...] Read more.
The entropy generation in unsteady three-dimensional axisymmetric magnetohydrodynamics (MHD) nanofluid flow over a non-linearly stretching sheet is investigated. The flow is subject to thermal radiation and a chemical reaction. The conservation equations are solved using the spectral quasi-linearization method. The novelty of the work is in the study of entropy generation in three-dimensional axisymmetric MHD nanofluid and the choice of the spectral quasi-linearization method as the solution method. The effects of Brownian motion and thermophoresis are also taken into account. The nanofluid particle volume fraction on the boundary is passively controlled. The results show that as the Hartmann number increases, both the Nusselt number and the Sherwood number decrease, whereas the skin friction increases. It is further shown that an increase in the thermal radiation parameter corresponds to a decrease in the Nusselt number. Moreover, entropy generation increases with respect to some physical parameters. Full article
(This article belongs to the Special Issue Entropy Generation in Nanofluid Flows)
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Open AccessArticle
Natural Convection and Entropy Generation in a Square Cavity with Variable Temperature Side Walls Filled with a Nanofluid: Buongiorno’s Mathematical Model
Entropy 2017, 19(7), 337; https://doi.org/10.3390/e19070337 - 05 Jul 2017
Cited by 20
Abstract
Natural convection heat transfer combined with entropy generation in a square cavity filled with a nanofluid under the effect of variable temperature distribution along left vertical wall has been studied numerically. Governing equations formulated in dimensionless non-primitive variables with corresponding boundary conditions taking [...] Read more.
Natural convection heat transfer combined with entropy generation in a square cavity filled with a nanofluid under the effect of variable temperature distribution along left vertical wall has been studied numerically. Governing equations formulated in dimensionless non-primitive variables with corresponding boundary conditions taking into account the Brownian diffusion and thermophoresis effects have been solved by finite difference method. Distribution of streamlines, isotherms, local entropy generation as well as Nusselt number has been obtained for different values of key parameters. It has been found that a growth of the amplitude of the temperature distribution along the left wall and an increase of the wave number lead to an increase in the average entropy generation. While an increase in abovementioned parameters for low Rayleigh number illustrates a decrease in average Bejan number. Full article
(This article belongs to the Special Issue Entropy Generation in Nanofluid Flows)
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Open AccessArticle
Effects of Movable-Baffle on Heat Transfer and Entropy Generation in a Cavity Saturated by CNT Suspensions: Three-Dimensional Modeling
Entropy 2017, 19(5), 200; https://doi.org/10.3390/e19050200 - 29 Apr 2017
Cited by 24
Abstract
Convective heat transfer and entropy generation in a 3D closed cavity, equipped with adiabatic-driven baffle and filled with CNT (carbon nanotube)-water nanofluid, are numerically investigated for a range of Rayleigh numbers from 103 to 105. This research is conducted for [...] Read more.
Convective heat transfer and entropy generation in a 3D closed cavity, equipped with adiabatic-driven baffle and filled with CNT (carbon nanotube)-water nanofluid, are numerically investigated for a range of Rayleigh numbers from 103 to 105. This research is conducted for three configurations; fixed baffle (V = 0), rotating baffle clockwise (V+) and rotating baffle counterclockwise (V−) and a range of CNT concentrations from 0 to 15%. Governing equations are formulated using potential vector vorticity formulation in its three-dimensional form, then solved by the finite volume method. The effects of motion direction of the inserted driven baffle and CNT concentration on heat transfer and entropy generation are studied. It was observed that for low Rayleigh numbers, the motion of the driven baffle enhances heat transfer regardless of its direction and the CNT concentration effect is negligible. However, with an increasing Rayleigh number, adding driven baffle increases the heat transfer only when it moves in the direction of the decreasing temperature gradient; elsewhere, convective heat transfer cannot be enhanced due to flow blockage at the corners of the baffle. Full article
(This article belongs to the Special Issue Entropy Generation in Nanofluid Flows)
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