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Journals
Processes
Special Issues
Thermal and Fluid Flow Processes in Sustainable and Conventional Energy
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Thermal and Fluid Flow Processes in Sustainable and Conventional Energy

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Energy Systems".

Deadline for manuscript submissions: 30 June 2025 | Viewed by 3349

Special Issue Editors

Dr. Tathagata Acharya

E-Mail Website
Guest Editor
Physics and Engineering, California State University, Bakersfield, CA 93311, USA
Interests: fluid mechanics; thermodynamics; heat transfer
Special Issues, Collections and Topics in MDPI journals
Dr. Sungwook Hong

E-Mail Website
Guest Editor
Department of Physics and Engineering, California State University, Science III, Room 210, Bakersfield, CA 93311, USA
Interests: numerical methods; molecular dynamic simulation

Special Issue Information

Dear Colleagues,

Thermal and fluid sciences are a field of engineering that finds usage within the areas of both conventional and sustainable energy. This Special Issue on “Thermal and Fluid Flow Processes in Sustainable and Conventional Energy” seeks high-quality manuscripts focusing on novel and significant developments in the area of thermal and fluid science applications in relation to conventional and sustainable energy. Studies associated with computational fluid dynamics (CFD), heat transfer, experimental fluid dynamics, and theoretical research in these areas are highly encouraged. Topics include, but are not limited to, the following:

  • Petroleum engineering;
  • Fossil fuels;
  • Wind energy;
  • Solar energy;
  • Carbon capture and sequestration;
  • Stormwater management.

Dr. Tathagata Acharya
Dr. Sungwook Hong
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. Processes 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 2400 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

  • computational fluid dynamics
  • experimental fluid mechanics
  • particle image velocimetry
  • petroleum engineering
  • renewable energy

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Further information on MDPI's Special Issue polices can be found here.

Published Papers (2 papers)

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Research

15 pages, 5424 KiB  
Article
Evaluation of CO2/Water Imbibition Relative Permeability Curves in Sandstone Core Flooding—A CFD Study
by Tathagata Acharya, Tapinder Dhaliwal, Alina Ludian, Gorang Popli, Benjamin Wilemon, Leonardo Hernandez, Maryam Farahani and Liaosha Song
Processes 2024, 12(10), 2176; https://doi.org/10.3390/pr12102176 - 7 Oct 2024
Viewed by 1304
Abstract
Greenhouse gases such as CO2 can be safely captured and stored in geologic formations, which in turn can reduce the carbon imprint in the Earth’s atmosphere and therefore help toward reducing global warming. The relative permeability characteristics in CO2/brine or [...] Read more.
Greenhouse gases such as CO2 can be safely captured and stored in geologic formations, which in turn can reduce the carbon imprint in the Earth’s atmosphere and therefore help toward reducing global warming. The relative permeability characteristics in CO2/brine or CO2/water systems provide insight into the CO2 trapping efficacy of formations such as sandstone rocks. In this research, CO2/water imbibition relative permeability characteristics in a typical sandstone core sample are numerically evaluated. This work uses transient computational fluid dynamics (CFD) simulations to study relative permeability characteristics, and a sensitivity analysis is performed based on two different injection pressures and absolute permeability values of the sandstone rock material. Results show that when the irreducible water fraction remains unchanged, the imbibition relative permeability to the non-wetting phase decreases with an increase in injection pressure within the sandstone core sample. Also, with the irreducible water fraction being unchanged, relative permeabilities to both non-wetting and wetting phases decrease with an increase in the absolute permeability of the rock material. Finally, at irreducible water saturation, relative permeability to the gas phase decreases with an increase in injection pressure. Full article
(This article belongs to the Special Issue Thermal and Fluid Flow Processes in Sustainable and Conventional Energy)
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14 pages, 6970 KiB  
Article
Heat Transfer and Thermal Efficiency in Oxy-Fuel Retrofit of 0.5 MW Fire Tube Gas Boiler
by Joon Ahn
Processes 2024, 12(5), 959; https://doi.org/10.3390/pr12050959 - 9 May 2024
Viewed by 1641
Abstract
Industrial boilers cause significant energy wastage that could be mitigated with oxy-fuel combustion versus traditional air combustion. Despite several feasibility studies on oxy-fuel burners, they are widely avoided in industry due to major infrastructural challenges. This study measured the performance and heat transfer [...] Read more.
Industrial boilers cause significant energy wastage that could be mitigated with oxy-fuel combustion versus traditional air combustion. Despite several feasibility studies on oxy-fuel burners, they are widely avoided in industry due to major infrastructural challenges. This study measured the performance and heat transfer characteristics of each component in a 0.5 MW fire tube gas boiler after retrofitting it with an oxy-fuel burner. Comparisons were drawn across three combustion modes—air combustion, oxy-fuel combustion, and oxy-fuel flue gas recirculation (FGR). The Dittus–Boelter equation was employed to predict heat transfer in the fire tube for all combustion modes at full load (100%). Heat transfer in the latent heat section of the economizer was measured and compared with predictions using the Zukauskas equation. With this retrofit, oxy-fuel combustion improved the thermal efficiency by about 3–4%. In oxy-fuel combustion, the flow rate of exhaust gas decreased. When integrated into an existing fire tube boiler, the fire tube’s heat transfer contribution diminished greatly, suggesting the economic viability of a redesigned, reduced fire tube section. Additionally, a new design could address the notable increase in gas radiation from the fire tube in oxy-fuel and FGR, as well as aid in the efficient recovery of condensation heat from exhaust gases. Full article
(This article belongs to the Special Issue Thermal and Fluid Flow Processes in Sustainable and Conventional Energy)
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