Evaporation and Ignition of Isolated Fuel Drops in an Oxidizing Environment: Analytical Study Based on Varshavskii’s ‘Diffusion Theory’
Varshavskii’s ‘Diffusion Theory’, less investigated due to its limited international visibility, can offer one of the simplest and, on the other hand, high-accuracy methods for evaluating the ignition delay of fossil fuel and biofuel droplets, including their blend. In this study, experimental pre-t...
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2025-07-01
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| author | Laurencas Raslavičius |
| author_facet | Laurencas Raslavičius |
| author_sort | Laurencas Raslavičius |
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| description | Varshavskii’s ‘Diffusion Theory’, less investigated due to its limited international visibility, can offer one of the simplest and, on the other hand, high-accuracy methods for evaluating the ignition delay of fossil fuel and biofuel droplets, including their blend. In this study, experimental pre-tests were conducted to determine pre-existing subject knowledge on stationary droplet combustion at ambient pressure and temperatures varying from 935 to 1010 K followed by simulation of droplet ignition times. The test fuels were mineral diesel (DF), RME and a 20% RME blend with DF. Simulations were performed for isobaric conditions. Using the detailed transport model and detailed chemical kinetics, the necessary rearrangements were made for the governing equations to meet the criteria for modern fuels (biodiesel, diesel, and blend). The influence of different physical parameters, such as droplet radius, or initial conditions, on the ignition delay time was investigated. The high sensitivity of the proposed methodology to experimental results was substantiated. |
| format | Article |
| id | doaj-art-c649ab5057db4c67be603acf0793a3ec |
| institution | OA Journals |
| issn | 2076-3417 |
| language | English |
| publishDate | 2025-07-01 |
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| series | Applied Sciences |
| spelling | doaj-art-c649ab5057db4c67be603acf0793a3ec2025-08-20T02:35:46ZengMDPI AGApplied Sciences2076-34172025-07-011513748810.3390/app15137488Evaporation and Ignition of Isolated Fuel Drops in an Oxidizing Environment: Analytical Study Based on Varshavskii’s ‘Diffusion Theory’Laurencas Raslavičius0Faculty of Mechanical Engineering and Design, Kaunas University of Technology, LT-51424 Kaunas, LithuaniaVarshavskii’s ‘Diffusion Theory’, less investigated due to its limited international visibility, can offer one of the simplest and, on the other hand, high-accuracy methods for evaluating the ignition delay of fossil fuel and biofuel droplets, including their blend. In this study, experimental pre-tests were conducted to determine pre-existing subject knowledge on stationary droplet combustion at ambient pressure and temperatures varying from 935 to 1010 K followed by simulation of droplet ignition times. The test fuels were mineral diesel (DF), RME and a 20% RME blend with DF. Simulations were performed for isobaric conditions. Using the detailed transport model and detailed chemical kinetics, the necessary rearrangements were made for the governing equations to meet the criteria for modern fuels (biodiesel, diesel, and blend). The influence of different physical parameters, such as droplet radius, or initial conditions, on the ignition delay time was investigated. The high sensitivity of the proposed methodology to experimental results was substantiated.https://www.mdpi.com/2076-3417/15/13/7488ignition delayfuel dropletquasi–stationary combustioncombustion modellingdiffusion theoryVarshavskii |
| spellingShingle | Laurencas Raslavičius Evaporation and Ignition of Isolated Fuel Drops in an Oxidizing Environment: Analytical Study Based on Varshavskii’s ‘Diffusion Theory’ Applied Sciences ignition delay fuel droplet quasi–stationary combustion combustion modelling diffusion theory Varshavskii |
| title | Evaporation and Ignition of Isolated Fuel Drops in an Oxidizing Environment: Analytical Study Based on Varshavskii’s ‘Diffusion Theory’ |
| title_full | Evaporation and Ignition of Isolated Fuel Drops in an Oxidizing Environment: Analytical Study Based on Varshavskii’s ‘Diffusion Theory’ |
| title_fullStr | Evaporation and Ignition of Isolated Fuel Drops in an Oxidizing Environment: Analytical Study Based on Varshavskii’s ‘Diffusion Theory’ |
| title_full_unstemmed | Evaporation and Ignition of Isolated Fuel Drops in an Oxidizing Environment: Analytical Study Based on Varshavskii’s ‘Diffusion Theory’ |
| title_short | Evaporation and Ignition of Isolated Fuel Drops in an Oxidizing Environment: Analytical Study Based on Varshavskii’s ‘Diffusion Theory’ |
| title_sort | evaporation and ignition of isolated fuel drops in an oxidizing environment analytical study based on varshavskii s diffusion theory |
| topic | ignition delay fuel droplet quasi–stationary combustion combustion modelling diffusion theory Varshavskii |
| url | https://www.mdpi.com/2076-3417/15/13/7488 |
| work_keys_str_mv | AT laurencasraslavicius evaporationandignitionofisolatedfueldropsinanoxidizingenvironmentanalyticalstudybasedonvarshavskiisdiffusiontheory |