Direct numerical simulation of evaporating droplets based on a sharp-interface algebraic VOF approach
This study presents a sharp-interface algebraic volume-of-fluid (SA-VOF) approach towards direct numerical simulation of evaporating droplets in a finite-volume framework. An interface identification scheme is introduced to determine a sharp layer of interface cells where liquid-vapor phase change o...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2022
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/161768 |
| _version_ | 1826129407144624128 |
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| author | Shang, Xiaopeng Zhang, Xuan Nguyen, Thien-Binh Tran, Tuan |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Shang, Xiaopeng Zhang, Xuan Nguyen, Thien-Binh Tran, Tuan |
| author_sort | Shang, Xiaopeng |
| collection | NTU |
| description | This study presents a sharp-interface algebraic volume-of-fluid (SA-VOF) approach towards direct numerical simulation of evaporating droplets in a finite-volume framework. An interface identification scheme is introduced to determine a sharp layer of interface cells where liquid-vapor phase change occurs. The rate of vaporization is directly computed from the local gradient of the vapor mass fraction at the interface without any tuning parameter in the evaporation model. In addition, a modified compressive differencing scheme is employed to maintain high resolution of the interface. A solver based on the SA-VOF approach is developed and validated by several case studies including the Stefan problem for evaporation in one dimension, evaporation of sessile droplets in the constant contact angle mode, and evaporation of droplets suspended in a flowing air stream. Comparisons between numerical predictions and either analytical solutions or experimental data show that the SA-VOF approach not only computes the evaporation rate with high accuracy but also ensures highly resolved liquid-vapor interface. The solver demonstrates the capability in revealing minute details of the complex characteristics associated with droplet evaporation. |
| first_indexed | 2024-10-01T07:40:05Z |
| format | Journal Article |
| id | ntu-10356/161768 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:40:05Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1617682022-09-19T07:56:30Z Direct numerical simulation of evaporating droplets based on a sharp-interface algebraic VOF approach Shang, Xiaopeng Zhang, Xuan Nguyen, Thien-Binh Tran, Tuan School of Mechanical and Aerospace Engineering Engineering::Mechanical engineering Direct Numerical Simulation Droplet Evaporation This study presents a sharp-interface algebraic volume-of-fluid (SA-VOF) approach towards direct numerical simulation of evaporating droplets in a finite-volume framework. An interface identification scheme is introduced to determine a sharp layer of interface cells where liquid-vapor phase change occurs. The rate of vaporization is directly computed from the local gradient of the vapor mass fraction at the interface without any tuning parameter in the evaporation model. In addition, a modified compressive differencing scheme is employed to maintain high resolution of the interface. A solver based on the SA-VOF approach is developed and validated by several case studies including the Stefan problem for evaporation in one dimension, evaporation of sessile droplets in the constant contact angle mode, and evaporation of droplets suspended in a flowing air stream. Comparisons between numerical predictions and either analytical solutions or experimental data show that the SA-VOF approach not only computes the evaporation rate with high accuracy but also ensures highly resolved liquid-vapor interface. The solver demonstrates the capability in revealing minute details of the complex characteristics associated with droplet evaporation. Ministry of Education (MOE) This study is supported by the Republic of Singapore’s Ministry of Education (MOE, grant number MOE2018-T2-2-113). 2022-09-19T07:56:30Z 2022-09-19T07:56:30Z 2022 Journal Article Shang, X., Zhang, X., Nguyen, T. & Tran, T. (2022). Direct numerical simulation of evaporating droplets based on a sharp-interface algebraic VOF approach. International Journal of Heat and Mass Transfer, 184, 122282-. https://dx.doi.org/10.1016/j.ijheatmasstransfer.2021.122282 0017-9310 https://hdl.handle.net/10356/161768 10.1016/j.ijheatmasstransfer.2021.122282 2-s2.0-85120465513 184 122282 en MOE2018-T2-2-113 International Journal of Heat and Mass Transfer © 2021 Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering::Mechanical engineering Direct Numerical Simulation Droplet Evaporation Shang, Xiaopeng Zhang, Xuan Nguyen, Thien-Binh Tran, Tuan Direct numerical simulation of evaporating droplets based on a sharp-interface algebraic VOF approach |
| title | Direct numerical simulation of evaporating droplets based on a sharp-interface algebraic VOF approach |
| title_full | Direct numerical simulation of evaporating droplets based on a sharp-interface algebraic VOF approach |
| title_fullStr | Direct numerical simulation of evaporating droplets based on a sharp-interface algebraic VOF approach |
| title_full_unstemmed | Direct numerical simulation of evaporating droplets based on a sharp-interface algebraic VOF approach |
| title_short | Direct numerical simulation of evaporating droplets based on a sharp-interface algebraic VOF approach |
| title_sort | direct numerical simulation of evaporating droplets based on a sharp interface algebraic vof approach |
| topic | Engineering::Mechanical engineering Direct Numerical Simulation Droplet Evaporation |
| url | https://hdl.handle.net/10356/161768 |
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