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Fluids
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Numerical Simulations of Spray Processes
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Numerical Simulations of Spray Processes

A special issue of Fluids (ISSN 2311-5521). This special issue belongs to the section "Mathematical and Computational Fluid Mechanics".

Deadline for manuscript submissions: closed (31 May 2022) | Viewed by 4987

Special Issue Editor

Prof. Dr. Eva Gutheil

E-Mail Website
Guest Editor
Interdisciplinary Center for Scientific Computing, Heidelberg University, 69120 Heidelberg, Germany
Interests: simulations; multiphase flows; combustion; upper respiratory system; flame spray pyrolysis; ozone depletion in polar regions

Special Issue Information

Dear Colleagues,

Spray processes play a major role in numerous technical applications, and their numerical simulation is extremely beneficial in understanding their underlying fundamentals. These include liquid injection, breakup and atomization, droplet size distributions, multiphase evaporation, mixing, turbulence, and possible chemical reactions. This Special Issue of Fluids encourages contributions of different application areas and aims to enhance the understanding of the interaction of fundamental processes in complex sprays.

Prof. Dr. Eva Gutheil
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 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. Fluids 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 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

  • spray processes
  • multicomponent sprays
  • evaporation and mixing
  • turbulence
  • chemical reactions
  • combustion

Published Papers (2 papers)

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Research

18 pages, 1254 KiB  
Article
Modeling and Parameterization of the Evaporation and Thermal Decomposition of an Iron(III) Nitrate Nonahydrate/Ethanol Droplet for Flame Spray Pyrolysis
by Praveen Narasu and Eva Gutheil
Fluids 2022, 7(5), 146; https://doi.org/10.3390/fluids7050146 - 23 Apr 2022
Cited by 3 | Viewed by 1822
Abstract
Flame spray pyrolysis (FSP) is a promising approach to generate nanoparticles from precursor solutions, where the convective droplet heating and evaporation of the single precursor solution droplet play a key role. Depending on the precursor solution under consideration, reactions inside the liquid may [...] Read more.
Flame spray pyrolysis (FSP) is a promising approach to generate nanoparticles from precursor solutions, where the convective droplet heating and evaporation of the single precursor solution droplet play a key role. Depending on the precursor solution under consideration, reactions inside the liquid may occur. The present numerical study concerns the heating, evaporation, and thermal decomposition of single droplets of iron(III) nitrate nonahydrate (INN) and ethanol at an initial temperature of 293.15 K in hot convective air at atmospheric pressure. If the ambience is below the thermal decomposition temperature (Tth) of the INN, iron nitrate particles are directly formed inside the particle, whereas at ambient temperatures beyond Tth, the iron nitrate thermally decomposes into gaseous Fe2O3 and N2O5. Vaporization and thermal decomposition govern the process, depending on the droplet surface temperature. If the ambient temperature is larger than a specific value T+, thermal decomposition is very fast and vaporization dominates the total process time, whereas at lower ambient temperatures, the vaporization is slower, which causes a lower final droplet surface temperature, leading to considerably longer thermal decomposition, which dominates the total process time under that condition. The ambient temperature at which this reversed behavior occurs depends on initial INN loading of the particle and the relative velocity but is largely independent of the initial droplet size. These new results are very useful in choosing the process temperature, which is recommended to lie beyond the ambient air temperature of T+ to assure that the total process time is kept short. The numerical results are parameterized for use in more complex simulations of FSP. Full article
(This article belongs to the Special Issue Numerical Simulations of Spray Processes)
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17 pages, 7697 KiB  
Article
A Numerical Study of Spray Strips Analysis on Fridsma Hull Form
by Samuel, Andi Trimulyono, Parlindungan Manik and Deddy Chrismianto
Fluids 2021, 6(11), 420; https://doi.org/10.3390/fluids6110420 - 22 Nov 2021
Cited by 9 | Viewed by 2410
Abstract
Spray strips are deflectors added to the hull to reduce the Wetted Surface Area (WSA). The reduced WSA will decrease the total ship drag caused by the deflection of the spray strip installation. The research aimed to predict the function of the spray [...] Read more.
Spray strips are deflectors added to the hull to reduce the Wetted Surface Area (WSA). The reduced WSA will decrease the total ship drag caused by the deflection of the spray strip installation. The research aimed to predict the function of the spray strip to improve ship performance using Computational Fluid Dynamics (CFD). The numerical approach in this study used the Finite Volume Method (FVM) with the RANS (Reynolds-averaged Navier–Stokes) equation to solve fluid dynamics problems. VOF (Volume of Fluid) was used to model the water and air phases. The results of this study indicated that the number of spray strips would have a significant effect compared to without using a spray strip. Spray strips with three strips could reduce the total resistance by 4.9% at Fr 1.78. Spray strips would increase the total resistance value by 2.1% at low speeds. Spray strips were effective for reducing total resistance at Fr > 1 or the planing mode conditions. The total resistance prediction used three suggestion profiles with the best performance to reduce total resistance by 6.0% at Fr 1.78. Full article
(This article belongs to the Special Issue Numerical Simulations of Spray Processes)
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