Special Issue "Heat and Mass Transfer: Advances in Heat and Mass Transfer in Porous Materials (Volume II)"

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Energy".

Deadline for manuscript submissions: 31 December 2020.

Special Issue Editor

Prof. Dr. Cheng-Yu Ku
Website SciProfiles
Guest Editor
Department of Harbor and River Engineering, National Taiwan Ocean University, No.2, Beining Rd., Jhongjheng District, Keelung City 202, Taiwan
Interests: meshless methods; heat and mass transfer; hydrogeology; foundation of offshore wind turbines; geotechnical analysis; geographic information systems
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Special Issue Information

Dear Colleagues,

Heat and mass transfer in porous materials generally covers a wide variety of applied sciences and engineering disciplines concerning theoretical research, fundamental studies, mathematical modeling, numerical simulations, and experimental investigations. Thanks to its significance and prevalence, the investigation of transport phenomena in porous materials has emerged as a distinct field of study.

This Special Issue welcomes high-quality submissions that, through theory and/or simulation, seek to advance the understanding of “Heat and Mass Transfer: Advances in Heat and Mass Transfer in Porous Materials”. It focuses on both analytical and numerical research, with an emphasis on contributions which increase the basic understanding of the equations governing the flow, heat, and mass transfer in porous materials and their analytical and numerical solutions to engineering problems. The scope of the Special Issue includes but is not limited to the following subjects:

  • Mesh reduction methods (including collocation method, radial basis function method, meshlessmethods, Trefftz method, method of fundamental solutions, general finite difference method, and others) for modeling the behavior of heat and mass transfer flow in porous materials;
  • Analytical methods for solving equations governing the flow, heat, and mass transfer in porous materials;
  • Computational techniques in conduction, convection, and radiation heat transfer;
  • Inverse problems in heat and mass transfer flow;
  • Fluid flow and transfer in porous media;
  • Applications of heat and mass transfer in engineering;
  • Other topics on transport phenomena in porous media.

Prof. Dr. Cheng-Yu Ku
Guest Editor

Manuscript Submission Information

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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. Applied Sciences is an international peer-reviewed open access semimonthly 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 1800 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

  • Heat and mass transfer flow
  • Meshlessmethods
  • Analytical method
  • Computational technique
  • Mesh reduction method
  • Porous material
  • Inverse problem

Published Papers (3 papers)

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Research

Open AccessArticle
Selective Laser Melting Heat Sinks under Jet Impingement Cooling for Heat Dissipation of Higher Light Output LED Lighting in a Limited Space
Appl. Sci. 2020, 10(11), 3898; https://doi.org/10.3390/app10113898 - 04 Jun 2020
Abstract
In this study, we aimed to create heat sinks with higher heat dissipation capabilities for a compact light-emitting diode (LED) recessed downlight (CLRDL) under jet impingement cooling. We desired to use the sinks in limited space to maintain lower junction temperature and allow [...] Read more.
In this study, we aimed to create heat sinks with higher heat dissipation capabilities for a compact light-emitting diode (LED) recessed downlight (CLRDL) under jet impingement cooling. We desired to use the sinks in limited space to maintain lower junction temperature and allow higher LED power. Perforated-finned heat sinks (PTFHSs) and metal-foam-like heat sinks (MFLHSs) fabricated using selective laser melting (SLM) were compared with a traditional finned heat sink (TTFHS). Two cooling fans with higher and lower velocity at Reynolds numbers of 16916 and 6594 were individually installed on each heat sink. Numerical simulations were performed using COMSOL rotating machinery and nonisothermal flow interface with the standard k-ε turbulence flow model. Validations were performed on this apparatus. The SLM heat sinks exhibited higher Nusselt numbers and lower thermal resistance than traditional heat sinks because of a relatively higher heat transfer coefficient and larger heat transfer area. For the proposed SLM heat sinks with larger surface areas, complex flow channels, and ventilation holes under jet impingement cooling, the PTFHS exhibited the highest heat transfer enhancement followed by MFLHS and TTFHS. The results contribute to solving the problems of heat dissipation of higher light output LED lighting. Full article
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Open AccessArticle
Solving Backward Heat Conduction Problems Using a Novel Space–Time Radial Polynomial Basis Function Collocation Method
Appl. Sci. 2020, 10(9), 3215; https://doi.org/10.3390/app10093215 - 05 May 2020
Abstract
In this article, a novel meshless method using space–time radial polynomial basis function (SRPBF) for solving backward heat conduction problems is proposed. The SRPBF is constructed by incorporating time-dependent exponential function into the radial polynomial basis function. Different from the conventional radial basis [...] Read more.
In this article, a novel meshless method using space–time radial polynomial basis function (SRPBF) for solving backward heat conduction problems is proposed. The SRPBF is constructed by incorporating time-dependent exponential function into the radial polynomial basis function. Different from the conventional radial basis function (RBF) collocation method that applies the RBF at each center point coinciding with the inner point, an innovative source collocation scheme using the sources instead of the centers is first developed for the proposed method. The randomly unstructured source, boundary, and inner points are collocated in the space–time domain, where both boundary as well as initial data may be regarded as space–time boundary conditions. The backward heat conduction problem is converted into an inverse boundary value problem such that the conventional time–marching scheme is not required. Because the SRPBF is infinitely differentiable and the corresponding derivative is a nonsingular and smooth function, solutions can be approximated by applying the SRPBF without the shape parameter. Numerical examples including the direct and backward heat conduction problems are conducted. Results show that more accurate numerical solutions than those of the conventional methods are obtained. Additionally, it is found that the error does not propagate with time such that absent temperature on the inaccessible boundaries can be recovered with high accuracy. Full article
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Open AccessArticle
Modeling the Natural Convection Flow in a Square Porous Enclosure Filled with a Micropolar Nanofluid under Magnetohydrodynamic Conditions
Appl. Sci. 2020, 10(5), 1633; https://doi.org/10.3390/app10051633 - 29 Feb 2020
Cited by 1
Abstract
The laminar, natural convective flow of a micropolar nanofluid in the presence of a magnetic field in a square porous enclosure was studied. The micropolar nanofluid is considered to be an electrically conductive fluid. The governing equations of the flow problem are the [...] Read more.
The laminar, natural convective flow of a micropolar nanofluid in the presence of a magnetic field in a square porous enclosure was studied. The micropolar nanofluid is considered to be an electrically conductive fluid. The governing equations of the flow problem are the conservation of mass, energy, and linear momentum, as well as the angular momentum and the induction equations. In the proposed model, the Darcy–Brinkman momentum equations with buoyancy and advective inertia are used. Experimentally obtained forms of the dynamic viscosity, the thermal conductivity, and the electric conductivity are employed. A meshless point collocation method has been applied to numerically solve the flow and transport equations in their vorticity-stream function formulation. The effects of characteristic dimensionless parameters, such as the Rayleigh and Hartmann numbers, for a range of porosity and solid volume fraction of Al2O3 particles in a water-based micropolar nanofluid on the flow and heat transfer in the cavity are investigated. The results indicate that the intensity of the magnetic field significantly affects both the flow and the temperature distributions. Moreover, the addition of nanoparticles deteriorates the heat-transfer efficiency under specific conditions. Full article
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