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Special Issue "Numerical Simulation of Convective-Radiative Heat Transfer"

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "Thermal Management".

Deadline for manuscript submissions: 31 August 2019

Special Issue Editor

Guest Editor
Prof. Dr. Mikhail Sheremet

Laboratory on Convective Heat and Mass Transfer and Department of Theoretical Mechanics, Tomsk State University, Tomsk 634050, Russia
Website | E-Mail
Interests: convective heat and mass transfer; conjugate heat transfer; radiation heat transfer; turbulent modes; fluid flow and heat transfer in nanofluids; entropy generation analysis; heat and mass transfer in porous media; heat transfer and flow pattern in electronic systems

Special Issue Information

Dear colleagues,

Heat transfer is the main transport process for various engineering and natural systems. At the same time, the development of modern engineering apparatus and natural bio- and geo-systems is related to a deep understanding of the processes that have progressed in these systems. Convective and radiative heat transfer mechanisms are the dominant modes in the considered systems. Therefore, an in-depth study of these regimes is very important and useful for both the growth of industry and the preservation of natural resources. There are three main methods for an investigation of the considered heat transfer mechanisms. They are theoretical methods, experimental methods, and computational approaches. Theoretical methods are related, generally, to an analytical description of thermal processes using the laws of conservation of mass, momentum, angular momentum, and energy, while experimental analysis deals with an investigation of heat transfer processes using experimental techniques and measurements. The development of computer engineering allows one to use the plentiful opportunities of numerical simulation to obtain a description and an understanding of heat transfer processes. Such an approach includes the advantages of theoretical methods in which analysis can be performed in a wide range of all governing parameters and the advantages of experimental methods where the deep investigation is possible. Therefore, numerical simulation of convective and radiative heat transfer is a very useful and important topic for different fields of industry and various natural systems.

The present Special Issue will focus on the simulation of convective and radiative heat transfer in engineering systems and natural bio- and geo-systems. It is a very good opportunity to combine original manuscripts on the considered topic to present useful guidelines for future research.

Prof. Dr. Mikhail Sheremet
Guest Editor

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 papers will be 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. Energies 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

  • convective heat and mass transfer
  • radiative heat transfer
  • turbulent transport
  • phase change materials
  • porous media
  • nanofluids
  • electronics cooling
  • heat exchangers
  • solar collectors
  • thermal power plants
  • bio- and geo-systems

Published Papers (7 papers)

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Research

Open AccessArticle
Domestic Hot Water Storage Tank Utilizing Phase Change Materials (PCMs): Numerical Approach
Energies 2019, 12(11), 2170; https://doi.org/10.3390/en12112170 (registering DOI)
Received: 25 April 2019 / Revised: 4 June 2019 / Accepted: 4 June 2019 / Published: 6 June 2019
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Abstract
Thermal energy storage (TES) is an essential part of a solar thermal/hot water system. It was shown that TES significantly enhances the efficiency and cost effectiveness of solar thermal systems by fulfilling the gap/mismatch between the solar radiation supply during the day and [...] Read more.
Thermal energy storage (TES) is an essential part of a solar thermal/hot water system. It was shown that TES significantly enhances the efficiency and cost effectiveness of solar thermal systems by fulfilling the gap/mismatch between the solar radiation supply during the day and peak demand/load when sun is not available. In the present paper, a three-dimensional numerical model of a water-based thermal storage tank to provide domestic hot water demand is conducted. Phase change material (PCM) was used in the tank as a thermal storage medium and was connected to a photovoltaic thermal collector. The present paper shows the effectiveness of utilizing PCMs in a commercial 30-gallon domestic hot water tank used in buildings. The storage efficiency and the outlet water temperature were predicted to evaluate the storage system performance for different charging flow rates and different numbers of families demands. The results revealed that increases in the hot water supply coming from the solar collector caused increases in the outlet water temperature during the discharge period for one family demand. In such a case, it was observed that the storage efficiency was relatively low. Due to low demand (only one family), the PCMs were not completely crystallized at the end of the discharge period. The results showed that the increases in the family’s demand improve the thermal storage efficiency due to the increases in the portion of the energy that is recovered during the nighttime. Full article
(This article belongs to the Special Issue Numerical Simulation of Convective-Radiative Heat Transfer)
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Open AccessArticle
Natural Convection of Non-Newtonian Power-Law Fluid in a Square Cavity with a Heat-Generating Element
Energies 2019, 12(11), 2149; https://doi.org/10.3390/en12112149 (registering DOI)
Received: 1 May 2019 / Revised: 31 May 2019 / Accepted: 1 June 2019 / Published: 5 June 2019
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Abstract
Development of modern technology in microelectronics and power engineering necessitates the creation of effective cooling systems. This is made possible by the use of the special fins technology within the cavity or special heat transfer liquids in order to intensify the heat removal [...] Read more.
Development of modern technology in microelectronics and power engineering necessitates the creation of effective cooling systems. This is made possible by the use of the special fins technology within the cavity or special heat transfer liquids in order to intensify the heat removal from the heat-generating elements. The present work is devoted to the mathematical modeling of thermogravitational convection of a non-Newtonian fluid in a closed square cavity with a local source of internal volumetric heat generation. The behavior of the fluid is described by the Ostwald-de Waele power law model. The defining Navier–Stokes equations written using the dimensionless stream function, vorticity and temperature are solved using the finite difference method. The effects of the Rayleigh number, power-law index, and thermal conductivity ratio on heat transfer and the flow structure are studied. The obtained results are presented in the form of isolines of the stream function and temperature, as well as the dependences of the average Nusselt number and average temperature on the governing parameters. Full article
(This article belongs to the Special Issue Numerical Simulation of Convective-Radiative Heat Transfer)
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Graphical abstract

Open AccessArticle
How Big Is an Error in the Analytical Calculation of Annular Fin Efficiency?
Energies 2019, 12(9), 1787; https://doi.org/10.3390/en12091787 (registering DOI)
Received: 14 April 2019 / Revised: 30 April 2019 / Accepted: 8 May 2019 / Published: 10 May 2019
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Abstract
An important role in the dimensioning of heat exchange surfaces with an annular fin is the fin efficiency. The fin efficiency is usually calculated using analytical expressions developed in the last century. However, these expressions are derived with certain assumptions and simplifications that [...] Read more.
An important role in the dimensioning of heat exchange surfaces with an annular fin is the fin efficiency. The fin efficiency is usually calculated using analytical expressions developed in the last century. However, these expressions are derived with certain assumptions and simplifications that involve a certain error in the calculation. The purpose of this paper is to determine the size of the error due to the assumptions and simplifications made when performing the analytical expression and to present what has the greatest impact on the amount of error, and give a recommendation on how to reduce that error. In order to determine the error, but also to gain a more detailed insight into the physics of heat exchange processes on the fin surface, computational fluid dynamics was applied to the original definition of fin efficiency. This means that a numerical simulation was performed for the actual fin material and for the ideal fin material with infinite thermal conductivity for the selected fin geometry and Re numbers from 2000 to 18,000. The results show that fin efficiency determined by numerical simulations is greater by up to 12.3% than the efficiency calculated analytically. The greatest impact on the amount of error is the assumption of the same temperature of the fin base surface and the outer tube surface and the assumption of equal heat transfer coefficient on the entire fin surface area. Using a newly recommended expression for the equivalent length of the fin tip, it would be possible to calculate the fin efficiency more precisely and thus the average heat transfer coefficient on the fin surface area, which leads to a more accurate dimensioning of the heat exchanger. Full article
(This article belongs to the Special Issue Numerical Simulation of Convective-Radiative Heat Transfer)
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Open AccessArticle
Simulation of Vortex Heat Transfer Enhancement in the Turbulent Water Flow in the Narrow Plane-Parallel Channel with an Inclined Oval-trench Dimple of Fixed Depth and Spot Area
Energies 2019, 12(7), 1296; https://doi.org/10.3390/en12071296
Received: 1 February 2019 / Revised: 18 March 2019 / Accepted: 29 March 2019 / Published: 4 April 2019
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Abstract
This article is devoted to the development of the multiblock technique for numerical simulation of vortex heat transfer enhancement (VHTE) by inclined oval-trench dimples. Special attention is paid both to the analysis of numerical predictions of different-type boundary conditions at the wall: T [...] Read more.
This article is devoted to the development of the multiblock technique for numerical simulation of vortex heat transfer enhancement (VHTE) by inclined oval-trench dimples. Special attention is paid both to the analysis of numerical predictions of different-type boundary conditions at the wall: T = const and q = const and to the comparison of the standard and modified shear stress transport models. The article discusses the mechanism of change in the flow structure and secondary flow augmentation due to an increase in a relative length of an oval-trench dimple (at its fixed spot area, depth and orientation) where a long spiral vortex is formed. Full article
(This article belongs to the Special Issue Numerical Simulation of Convective-Radiative Heat Transfer)
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Open AccessArticle
A Stability Analysis for Magnetohydrodynamics Stagnation Point Flow with Zero Nanoparticles Flux Condition and Anisotropic Slip
Energies 2019, 12(7), 1268; https://doi.org/10.3390/en12071268
Received: 12 January 2019 / Revised: 18 February 2019 / Accepted: 19 February 2019 / Published: 2 April 2019
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Abstract
The numerical study of nanofluid stagnation point flow coupled with heat and mass transfer on a moving sheet with bi-directional slip velocities is emphasized. A magnetic field is considered normal to the moving sheet. Buongiorno’s model is utilized to assimilate the mixed effects [...] Read more.
The numerical study of nanofluid stagnation point flow coupled with heat and mass transfer on a moving sheet with bi-directional slip velocities is emphasized. A magnetic field is considered normal to the moving sheet. Buongiorno’s model is utilized to assimilate the mixed effects of thermophoresis and Brownian motion due to the nanoparticles. Zero nanoparticles’ flux condition at the surface is employed, which indicates that the nanoparticles’ fraction are passively controlled. This condition makes the model more practical for certain engineering applications. The continuity, momentum, energy and concentration equations are transformed into a set of nonlinear ordinary (similarity) differential equations. Using bvp4c code in MATLAB software, the similarity solutions are graphically demonstrated for considerable parameters such as thermophoresis, Brownian motion and slips on the velocity, nanoparticles volume fraction and temperature profiles. The rate of heat transfer is reduced with the intensification of the anisotropic slip (difference of two-directional slip velocities) and the thermophoresis parameter, while the opposite result is obtained for the mass transfer rate. The study also revealed the existence of non-unique solutions on all the profiles, but, surprisingly, dual solutions exist boundlessly for any positive value of the control parameters. A stability analysis is implemented to assert the reliability and acceptability of the first solution as the physical solution. Full article
(This article belongs to the Special Issue Numerical Simulation of Convective-Radiative Heat Transfer)
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Graphical abstract

Open AccessFeature PaperArticle
The Influence of Surface Radiation on the Passive Cooling of a Heat-Generating Element
Energies 2019, 12(6), 980; https://doi.org/10.3390/en12060980
Received: 21 February 2019 / Revised: 6 March 2019 / Accepted: 9 March 2019 / Published: 13 March 2019
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Abstract
Low-power electronic devices are suitably cooled by thermogravitational convection and radiation. The use of modern methods of computational mechanics makes it possible to develop efficient passive cooling systems. The present work deals with the numerical study of radiative-convective heat transfer in enclosure with [...] Read more.
Low-power electronic devices are suitably cooled by thermogravitational convection and radiation. The use of modern methods of computational mechanics makes it possible to develop efficient passive cooling systems. The present work deals with the numerical study of radiative-convective heat transfer in enclosure with a heat-generating source such as an electronic chip. The governing unsteady Reynolds-averaged Navier–Stokes (URANS) equations were solved using the finite difference method. Numerical results for the stream function–vorticity formulation are shown in the form of isotherm and streamline plots and average Nusselt numbers. The influence of the relevant parameters such as the Ostrogradsky number, surface emissivity, and the Rayleigh number on fluid flow characteristics and thermal transmission are investigated in detail. The comparative assessment clearly emphasizes the effect of surface radiation on the overall energy balance and leads to change the mean temperature inside the heat generating element. The results of the present study can be applied to the design of passive cooling systems. Full article
(This article belongs to the Special Issue Numerical Simulation of Convective-Radiative Heat Transfer)
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Open AccessArticle
Mixed Convection Stagnation-Point Flow of a Nanofluid Past a Permeable Stretching/Shrinking Sheet in the Presence of Thermal Radiation and Heat Source/Sink
Energies 2019, 12(5), 788; https://doi.org/10.3390/en12050788
Received: 27 December 2018 / Revised: 5 February 2019 / Accepted: 12 February 2019 / Published: 27 February 2019
Cited by 1 | PDF Full-text (5550 KB) | HTML Full-text | XML Full-text
Abstract
In this study we numerically examine the mixed convection stagnation-point flow of a nanofluid over a vertical stretching/shrinking sheet in the presence of suction, thermal radiation and a heat source/sink. Three distinct types of nanoparticles, copper (Cu), alumina (Al2O3) [...] Read more.
In this study we numerically examine the mixed convection stagnation-point flow of a nanofluid over a vertical stretching/shrinking sheet in the presence of suction, thermal radiation and a heat source/sink. Three distinct types of nanoparticles, copper (Cu), alumina (Al2O3) and titania (TiO2), were investigated with water as the base fluid. The governing partial differential equations were converted into ordinary differential equations with the aid of similarity transformations and solved numerically by utilizing the bvp4c programme in MATLAB. Dual (upper and lower branch) solutions were determined within a particular range of the mixed convection parameters in both the opposing and assisting flow regions and a stability analysis was carried out to identify which solutions were stable. Accordingly, solutions were gained for the reduced skin friction coefficients, the reduced local Nusselt number, along with the velocity and temperature profiles for several values of the parameters, which consists of the mixed convection parameter, the solid volume fraction of nanoparticles, the thermal radiation parameter, the heat source/sink parameter, the suction parameter and the stretching/shrinking parameter. Furthermore, the solutions were presented in graphs and discussed in detail. Full article
(This article belongs to the Special Issue Numerical Simulation of Convective-Radiative Heat Transfer)
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