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Entropy
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Heat Transfer in Nanofluids and Porous Media
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Heat Transfer in Nanofluids and Porous Media

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

Deadline for manuscript submissions: closed (31 August 2021) | Viewed by 5103

Special Issue Editors

Prof. Dr. Sergio Nardini

E-Mail Website
Guest Editor
Dipartimento di Ingegneria, Università degli Studi della Campania “Luigi Vanvitelli”, Via Roma 29, 81031 Aversa, CE, Italy
Interests: thermal systems; active solar systems; passive solar systems; heat transfer with nanofluids and porous media; forecast of energy consumption
Special Issues, Collections and Topics in MDPI journals
Dr. Bernardo Buonomo

E-Mail Website
Guest Editor
Dipartimento di Ingegneria.Università degli Studi della Campania "Luigi Vanvitelli", Via Roma 29, 81031 Aversa (CE), Italy
Interests: entropy generation; convective heat transfer; heat transfer by nanofluids; thermal storage; heat transfer in porous media; heat transfer in microchannel
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Heat and mass transport processes in porous media and with nanofluids have been the topic of many studies in recent years. The use of nanofluids and porous media represents two effective ways to improve heat transfer in many engineering applications, such as solar collectors, heat storages, insulation building, geothermal systems, compact heat transfer exchangers, compact heat sinks, and so on.

Nanofluids are liquid mixtures consisting of solid nanoparticles, with higher thermal conductivity, suspended in a base fluid such as water or oil. The solid nanoparticles are usually metals, oxide metals with a size of the order to 100 nm or smaller. The enhancement of heat transfer in nanofluids is linked to the increase of overall thermal conductivity of the mixture with respect to the base fluid. The improvement of heat transfer in porous media is due to a significant increase in the contact surface between the fluid and the solid structure and the high overall thermal conductivity with respect to the fluid.

The aim for this Special Issue is to encourage the scholars to present new advances in the topic of heat transfer in porous media and nanofluids, and to collect original research articles as well as review articles on the most recent developments and research efforts in this field, with the purpose of providing guidelines for future research directions.

Prof. Sergio Nardini
Ass. Prof. Bernardo Buonomo
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 generation
  • fluid dynamics
  • multiphase flow
  • heat transfer enhancement
  • porous media
  • nanofluids
  • ferrofluids
  • effective thermal conductivity
  • porosity
  • metal foam
  • volume averaging

Published Papers (2 papers)

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Research

25 pages, 5571 KiB  
Article
Analytical Analysis of Heat Transfer and Entropy Generation in a Tube Filled with Double-Layer Porous Media
by Kun Yang, Wei Huang, Xin Li and Jiabing Wang
Entropy 2020, 22(11), 1214; https://doi.org/10.3390/e22111214 - 26 Oct 2020
Cited by 4 | Viewed by 1802
Abstract
The heat transfer and entropy generation in a tube filled with double-layer porous media are analytically investigated. The wall of the tube is subjected to a constant heat flux. The Darcy-Brinkman model is utilized to describe the fluid flow, and the local thermal [...] Read more.
The heat transfer and entropy generation in a tube filled with double-layer porous media are analytically investigated. The wall of the tube is subjected to a constant heat flux. The Darcy-Brinkman model is utilized to describe the fluid flow, and the local thermal non-equilibrium model is employed to establish the energy equations. The solutions of the temperature and velocity distributions are analytically derived and validated in limiting case. The analytical solutions of the local and total entropy generation, as well as the Nusselt number, are further derived to analyze the performance of heat transfer and irreversibility of the tube. The influences of the Darcy number, the Biot number, the dimensionless interfacial radius, and the thermal conductivity ratio, on flow and heat transfer are discussed. The results indicate, for the first time, that the Nusselt number for the tube filled with double-layer porous media can be larger than that for the tube filled with single layer porous medium, while the total entropy generation rate for the tube filled with double-layer porous media can be less than that for the tube filled with single layer porous medium. And the dimensionless interfacial radius corresponding to the maximum value of the Nusselt number is different from that corresponding to the minimum value of the total entropy generation rate. Full article
(This article belongs to the Special Issue Heat Transfer in Nanofluids and Porous Media)
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22 pages, 941 KiB  
Article
Heat Transfer Enhancement in Unsteady MHD Natural Convective Flow of CNTs Oldroyd-B Nanofluid under Ramped Wall Velocity and Ramped Wall Temperature
by Talha Anwar, Poom Kumam, Ilyas Khan and Wiboonsak Watthayu
Entropy 2020, 22(4), 401; https://doi.org/10.3390/e22040401 - 31 Mar 2020
Cited by 16 | Viewed by 2718
Abstract
This article analyzes heat transfer enhancement in incompressible time dependent magnetohydrodynamic (MHD) convective flow of Oldroyd-B nanofluid with carbon nanotubes (CNTs). Single wall carbon nanotubes (SWCNTs) and multi-wall carbon nanotubes (MWCNTs) are immersed in a base fluid named Sodium alginate. The flow is [...] Read more.
This article analyzes heat transfer enhancement in incompressible time dependent magnetohydrodynamic (MHD) convective flow of Oldroyd-B nanofluid with carbon nanotubes (CNTs). Single wall carbon nanotubes (SWCNTs) and multi-wall carbon nanotubes (MWCNTs) are immersed in a base fluid named Sodium alginate. The flow is restricted to an infinite vertical plate saturated in a porous material incorporating the generalized Darcy’s law and heat suction/injection. The governing equations for momentum, shear stress and energy are modelled in the form of partial differential equations along with ramped wall temperature and ramped wall velocity boundary conditions. Laplace transformation is applied to convert principal partial differential equations to ordinary differential equations first and, later, complex multivalued functions of Laplace parameter are handled with numerical inversion to obtain the solutions in real time domain. Expression for Nusselt number is also obtained to clearly examine the difference in rate of heat transfer. A comparison for isothermal wall condition and ramped wall condition is also made to analyze the difference in both profiles. A graphical study is conducted to analyze how the fluid profiles are significantly affected by several pertinent parameters. Rate of heat transfer increases with increasing volume fraction of nanoparticle while shear stress reduces with elevation in retardation time. Moreover, flow gets accelerated with increase in Grashof number and Porosity parameter. For every parameter, a comparison between solutions of SWCNTs and MWCNTs is also presented. Full article
(This article belongs to the Special Issue Heat Transfer in Nanofluids and Porous Media)
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