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Selected Papers from XIV International Conference on Computational Heat, Mass and Momentum Transfer (ICCHMT2023)

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A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "J1: Heat and Mass Transfer".

Deadline for manuscript submissions: closed (31 January 2024) | Viewed by 4124

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Special Issue Editors

Prof. Dr. Jan Taler

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Department of Energy, Cracow University of Technology, ul. Warszawska 24, 31-155 Cracow, Poland
Interests: power engineering; thermodynamics; heat transfer; inverse heat transfer problems; steam boiler dynamics; thermal stresses
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Prof. Dr. Tomasz Sobota

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Department of Thermal Processes, Air Protection and Waste Utilization, Cracow University of Technology, 31-155 Cracow, Poland
Interests: mathematical modelling and experimental studies of heat exchangers; identification of the actual operating conditions of energy machines and equipment (measurement of temperature, heat flux density, heat transfer and heat transfer coefficients, pollution emissions); nuclear power engineering; heat recovery in power units; possibility of revitalisation of coal-fired power plants; environmental protection in power engineering (technologies for emission reduction to the atmosphere); renewable power engineering (wind and solar energy)
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Dr. Monika Rerak

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Department of Energy, Cracow University of Technology, ul. Warszawska 24, 31-155 Cracow, Poland
Interests: energy engineering; energy systems; heat transfer

Special Issue Information

Dear Colleagues,

ICCHMT is an international conference series that is widely recognized and respected in the international scientific community. ICCHMT was founded by Professor Abdulmajeed A. Mohamad from University of Calgary, and for nearly 20 years it has taken place in different parts of the world: Magusa, Cyprus (1999); Rio de Janeiro, Brazil (2001); Banff, Canada (2003); Paris, France (2005); Canmore, Canada (2007); Guangzhou, China (2009); Istambul, Turkey (2011 and 2015); Cracow, Poland (2016); Seoul, South Korea (2017); Cracow, Poland (2018); Rome, Italy (2019); Paris, France (2020); Paris, France (2021); and Rhodes island, Greece (2022); In 2023, the Conference will be held in Düsseldorf (Germany). The conference topics dedicated to energy topics are as follows:

Heat Exchangers/heat pipe;
Fluid machinery;
Internal flow and heat transfer;
Micro/nano heat and mass transfer;
Mixing devices and phenomena;
Multi-phase flows;
Reactive flows and combustion;
Steam and gas turbines;
Technology for renewable energy sources;
Thermal flow visualization;
Thermal fluid machinery;
Transport phenomena in porous media;
Waste management and waste disposal.

Therefore, the manuscripts within these research area are most welcome.

Prof. Dr. Jan Taler
Prof. Dr. Tomasz Sobota
Dr. Monika Rerak
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. 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 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

energy systems
energy machinery
thermal power plants
thermodynamics
energy efficiency in buildings

Published Papers (4 papers)

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Research

21 pages, 3213 KiB

Open AccessArticle

Development of Correlations Based on CFD Study for Microchannel Condensation Flow of Environmentally Friendly Hydrocarbon Refrigerants

by Anıl Başaran and Ali Cemal Benim

Energies 2024, 17(7), 1531; https://doi.org/10.3390/en17071531 - 22 Mar 2024

Viewed by 401

Abstract

A CFD simulation of the condensation flow of R600a and R290 within microchannels was conducted to explore the effect of mass flux, hydraulic diameter, and vapour quality on heat transfer rate and pressure drop. Data obtained from CFD simulations were used to develop new heat transfer and pressure drop correlations for the condensation flows of R600a and R290, which are climate-friendly refrigerants. Steady-state numerical simulations of condensation flow of refrigerants were carried out inside a single circular microchannel with diameters varying between 0.2 and 0.6 mm. The volume of fluid approach was used in the proposed model, calculating the interface phase change using the Lee model. The CFD simulation model was validated via a comparison of the simulation results with the experimental data available in the literature. It is found that the newly developed Nu number correlation shows a deviation, with an Ave-MAE of 11.16%, compared to those obtained by CFD simulation. Similarly, the deviation between friction factors obtained by the newly proposed correlation and those obtained by CFD simulation is 20.81% Ave-MAE. Widely recognized correlations that are applicable to the condensation of refrigerants within small-scale channels were also evaluated by comparing newly developed correlations. It is concluded that the newly proposed correlation has a higher accuracy in predicting the heat transfer coefficient and pressure drop. This situation can contribute to the creation of a sustainable system via the use of microchannels and climate-friendly refrigerants, like R600a and R290. Full article

(This article belongs to the Special Issue Selected Papers from XIV International Conference on Computational Heat, Mass and Momentum Transfer (ICCHMT2023))

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21 pages, 11407 KiB

Open AccessArticle

Heat and Flow Characteristics of Aerofoil-Shaped Fins on a Curved Target Surface in a Confined Channel for an Impinging Jet Array

by Orhan Yalçınkaya, Ufuk Durmaz, Ahmet Ümit Tepe, Ali Cemal Benim and Ünal Uysal

Energies 2024, 17(5), 1238; https://doi.org/10.3390/en17051238 - 05 Mar 2024

Viewed by 482

Abstract

The main purpose of this investigation was to explore the heat transfer and flow characteristics of aero-foil-shaped fins combined with extended jet holes, specifically focusing on their feasibility in cooling turbine blades. In this study, a comprehensive investigation was carried out by applying impinging jet array cooling (IJAC) on a semi-circular curved surface, which was roughened using aerofoil-shaped fins. Numerical computations were conducted under three different Reynolds numbers (Re) ranging from 5000 to 25,000, while nozzle-to-target surface spacings (S/d) ranged from 0.5 to 8.0. Furthermore, an assessment was made of the impact of different fin arrangements, single-row (L₁), double-row (L₂), and triple-row (L₃), on convective heat transfer. Detailed examinations were performed on area-averaged and local Nusselt (Nu) numbers, flow properties, and the thermal performance criterion (TPC) on finned and smooth target surfaces. The study’s results revealed that the use of aerofoil-shaped fins and the reduction in S/d, along with surface roughening, led to significant increases in the local and area-averaged Nu numbers compared to the conventional IJAC scheme. The most notable heat transfer enhancement was observed at S/d = 0.5 utilizing extended jets and the surface design incorporating aerofoil-shaped fins. Under these specific conditions, the maximum heat transfer enhancement reached 52.81%. Moreover, the investigation also demonstrated that the highest TPC on the finned surface was achieved when S/d = 2.0 for L₂ at Re = 25,000, resulting in a TPC value of 1.12. Furthermore, reducing S/d and mounting aerofoil-shaped fins on the surface yielded a more uniform heat transfer distribution on the relevant surface than IJAC with a smooth surface, ensuring a relatively more uniform heat transfer distribution to minimize the risk of localized overheating. Full article

(This article belongs to the Special Issue Selected Papers from XIV International Conference on Computational Heat, Mass and Momentum Transfer (ICCHMT2023))

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14 pages, 14652 KiB

Open AccessArticle

Determination of Heat Transfer Correlations for Fluids Flowing through Plate Heat Exchangers Needed for Online Monitoring of District Heat Exchanger Fouling

by Tomasz Romanowicz, Jan Taler, Magdalena Jaremkiewicz and Tomasz Sobota

Energies 2023, 16(17), 6264; https://doi.org/10.3390/en16176264 - 28 Aug 2023

Viewed by 927

Abstract

This article deals with the problem of estimating the degree of fouling of plate heat exchangers (PHEs) used in district heating substations (where the working medium is water). A method for calculating the thermal resistance of fouling is proposed based on a comparison of the thermal resistance of a fouled and clean heat exchanger. The thermal resistance of the heat exchanger for both fouled and clean apparatuses is determined as the inverse of their overall heat transfer coefficient. In the method, the heat transfer coefficients necessary to determine the overall heat transfer coefficient of the clean exchanger are calculated using a modified Wilson method. Moreover, the heat transfer coefficients on the clean heat exchanger plates’ cold water side are determined based on experimental tests. The computational algorithm presented in this paper will make it possible to develop software to monitor and thus optimise the operation of district heating substations. Full article

(This article belongs to the Special Issue Selected Papers from XIV International Conference on Computational Heat, Mass and Momentum Transfer (ICCHMT2023))

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22 pages, 5674 KiB

Open AccessArticle

A Direct Numerical Simulation Assessment of Turbulent Burning Velocity Parametrizations for Non-Unity Lewis Numbers

by Vishnu Mohan, Marco Herbert, Markus Klein and Nilanjan Chakraborty

Energies 2023, 16(6), 2590; https://doi.org/10.3390/en16062590 - 09 Mar 2023

Cited by 2 | Viewed by 1353

Abstract

The predictions of turbulent burning velocity parameterizations for non-unity Lewis number flames have been assessed based on a single-step chemistry Direct Numerical Simulation (DNS) database of premixed Bunsen flames for different values of characteristic Lewis numbers ranging from 0.34 to 1.2. It has been found that the definition of the turbulent burning velocity is strongly dependent on the choice of projected flame brush area in the Bunsen burner configuration. The highest values of normalized turbulent burning velocity are obtained when the projected flame brush area is evaluated using the area of the isosurface of the Reynolds averaged reaction progress variable of 0.1 out of different options, namely the Favre averaged and Reynolds averaged isosurfaces of reaction progress variable of 0.5 and integral of the gradient of Favre and Reynolds averaged reaction progress variable. Because of the axisymmetric nature of the mean flame brush, the normalized turbulent burning velocity has been found to decrease as the burned gas side is approached, due to an increase in flame brush area with increasing radius. Most models for turbulent burning velocity provide comparable, reasonably accurate predictions for the unity Lewis number case when the projected flame brush area is evaluated using the isosurface of the Reynolds averaged reaction progress variable of 0.1. However, most of these parameterizations underpredict turbulent burning velocity values for Lewis numbers smaller than unity. A scaling relation has been utilized to extend these parameterizations for non-unity Lewis numbers. These revised parameterizations have been shown to be more successful than the original model expressions. These modified expressions also exhibit small values of L₂-norm of the relative error with respect to experimental data from literature for different Lewis numbers, higher turbulence intensity and thermodynamic pressure levels. Full article

(This article belongs to the Special Issue Selected Papers from XIV International Conference on Computational Heat, Mass and Momentum Transfer (ICCHMT2023))

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