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Thermal Physic Processes, Phase Transitions and Chemical Reactions in High-Temperature Gas, Vapour and Liquid Systems

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

Deadline for manuscript submissions: closed (30 September 2020) | Viewed by 10516

Special Issue Editor


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Guest Editor
Department of Power Engineering National Research, Tomsk Polytechnic University, 634050 Tomsk, Russia
Interests: energy; fuels; ignition; combustion chemistry; environmental performance; gas emissions; waste-derived fuels; coal–water slurry; waste to energy; thermal engineering; mathematical modeling; heat and mass transfer
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

High-temperature gas, vapor, and liquid flows have great potential for many applications, for example, thermal and flame water cleaning from unspecified hard and liquid impurities; production of hydrogen and syngas with the required component composition by heating wet condensates; production of heat carriers based on flue gases, vapor, and water; thermally loaded surface treatment and cleaning; defrosting of loose media by gas–vapor–droplet flows; and firefighting using water mist and polydisperse flows of water slurries and emulsions. High-temperature heating may lead to the generation of a buffer vapor layer near the liquid–gas interface, decreasing the heat flow from the gases to the droplet surface. Interactions of droplets and particles have a significant effect on the characteristics of multiphase flows. Great difficulties arise with reliable registration of evaporation rates and chemical reactions. Modern experimental methods and the most complete physical and mathematical models are required for development of perspective technologies.

This Special Issue looks at the new experimental and theoretical research results in the processes and phase transitions of perspective high-temperature multiphase flows on the base of gases, vapors, and liquids. We welcome research works on all aspects of thermal physic processes, phase transitions, and chemical reactions in high-temperature gas, vapor, and liquid systems for this Special Issue.

Prof. Dr. Pavel A. Strizhak
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. 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

  • thermal physics
  • heat and mass transfer
  • phase transitions
  • fluid dynamics
  • evaporation
  • droplets
  • liquid film
  • gases

Published Papers (3 papers)

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Research

17 pages, 3282 KiB  
Article
Gas Hydrate Combustion in Five Method of Combustion Organization
by Sergey Y. Misyura, Andrey Yu. Manakov, Galina S. Nyashina, Olga S. Gaidukova, Vladimir S. Morozov and Sergey S. Skiba
Entropy 2020, 22(7), 710; https://doi.org/10.3390/e22070710 - 27 Jun 2020
Cited by 27 | Viewed by 2377
Abstract
Experiments on the dissociation of a mixed gas hydrate in various combustion methods are performed. The simultaneous influence of two determining parameters (the powder layer thickness and the external air velocity) on the efficiency of dissociation is studied. It has been shown that [...] Read more.
Experiments on the dissociation of a mixed gas hydrate in various combustion methods are performed. The simultaneous influence of two determining parameters (the powder layer thickness and the external air velocity) on the efficiency of dissociation is studied. It has been shown that for the mixed hydrate, the dissociation rate under induction heating is 10–15 times higher than during the burning of a thick layer of powder, when the combustion is realized above the layer surface. The minimum temperature required for the initiation of combustion for different combustion methods was studied. As the height of the sample layer increases, the rate of dissociation decreases. The emissions of NOx and CO for the composite hydrate are higher than for methane hydrate at the same temperature in a muffle furnace. A comparison of harmful emissions during the combustion of gas hydrates with various types of coal fuels is presented. NOx concentration as a result of the combustion of gas hydrates is tens of times lower than when burning coal fuels. Increasing the temperature in the muffle furnace reduces the concentration of combustion products of gas hydrates. Full article
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14 pages, 6223 KiB  
Article
Conjugate Heat Transfer Investigation on Swirl-Film Cooling at the Leading Edge of a Gas Turbine Vane
by Haifen Du, Ziyue Mei, Jiayao Zou, Wei Jiang and Danmei Xie
Entropy 2019, 21(10), 1007; https://doi.org/10.3390/e21101007 - 15 Oct 2019
Cited by 12 | Viewed by 3843
Abstract
Numerical calculation of conjugate heat transfer was carried out to study the effect of combined film and swirl cooling at the leading edge of a gas turbine vane with a cooling chamber inside. Two cooling chambers (C1 and C2 cases) were [...] Read more.
Numerical calculation of conjugate heat transfer was carried out to study the effect of combined film and swirl cooling at the leading edge of a gas turbine vane with a cooling chamber inside. Two cooling chambers (C1 and C2 cases) were specially designed to generate swirl in the chamber, which could enhance overall cooling effectiveness at the leading edge. A simple cooling chamber (C0 case) was designed as a baseline. The effects of different cooling chambers were studied. Compared with the C0 case, the cooling chamber in the C1 case consists of a front cavity and a back cavity and two cavities are connected by a passage on the pressure side to improve the overall cooling effectiveness of the vane. The area-averaged overall cooling effectiveness of the leading edge ( ϕ ¯ ¯ ) was improved by approximately 57%. Based on the C1 case, the passage along the vane was divided into nine segments in the C2 case to enhance the cooling effectiveness at the leading edge, and ϕ ¯ ¯ was enhanced by 75% compared with that in the C0 case. Additionally, the cooling efficiency on the pressure side was improved significantly by using swirl-cooling chambers. Pressure loss in the C2 and C1 cases was larger than that in the C0 case. Full article
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20 pages, 4405 KiB  
Article
Gas-Vapor Mixture Temperature in the Near-Surface Layer of a Rapidly-Evaporating Water Droplet
by Dmitry Antonov, Roman Volkov and Pavel Strizhak
Entropy 2019, 21(8), 803; https://doi.org/10.3390/e21080803 - 16 Aug 2019
Viewed by 3858
Abstract
Mathematical modeling of the heat and mass transfer processes in the evaporating droplet–high-temperature gas medium system is difficult due to the need to describe the dynamics of the formation of the quasi-steady temperature field of evaporating droplets, as well as of a gas-vapor [...] Read more.
Mathematical modeling of the heat and mass transfer processes in the evaporating droplet–high-temperature gas medium system is difficult due to the need to describe the dynamics of the formation of the quasi-steady temperature field of evaporating droplets, as well as of a gas-vapor buffer layer around them and in their trace during evaporation in high-temperature gas flows. We used planar laser-induced fluorescence (PLIF) and laser-induced phosphorescence (LIP). The experiments were conducted with water droplets (initial radius 1–2 mm) heated in a hot air flow (temperature 20–500 °C, velocity 0.5–6 m/s). Unsteady temperature fields of water droplets and the gas-vapor mixture around them were recorded. High inhomogeneity of temperature fields under study has been validated. To determine the temperature in the so called dead zones, we solved the problem of heat transfer, in which the temperature in boundary conditions was set on the basis of experimental values. Full article
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