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Influence of the Soret effect on binary-species boundary layers at high pressure

Toki, Takahiko and Bellan, Josette R. (2022) Influence of the Soret effect on binary-species boundary layers at high pressure. In: AIAA SCITECH 2022 Forum. American Institute of Aeronautics and Astronautics , Reston, VA, Art. No. 2022-1368. ISBN 978-1-62410-631-6. https://resolver.caltech.edu/CaltechAUTHORS:20220210-928401000

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Abstract

Direct numerical simulations of binary-species temporal boundary layers at high pressure are performed. The main objective is to investigate the influence of the Soret effect on flow physics of binary-species boundary layers where the fluid has a uniform composition. The working fluid is a mixture of 25 % methane and 75 % nitrogen in mass fraction. Although the fluid composition is uniform at the initial condition, the mass fraction of methane increases near the wall when the wall temperature is hotter than the free stream temperature, whereas it decreases when the wall temperature is colder. The non-uniform mass fraction indicates that the uphill diffusion occurs near the wall. Investigation of fluctuations of the mass fraction reveals that the mass fraction fluctuates in the whole boundary layer, indicating that the uphill diffusion occurs even far from the wall. Examination of the species-mass diffusion balance for mean flow fields clarified that the Soret effect flux becomes large near the wall, and the large flux causes the non-uniform profile of the mass fraction near the wall.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.2514/6.2022-1368DOIArticle
https://doi.org/10.2514/6.2022-1368.vidDOIVideo Presentation
ORCID:
AuthorORCID
Toki, Takahiko0000-0002-3408-0681
Bellan, Josette R.0000-0001-9218-7017
Additional Information:© 2022 by California Institute of Technology. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission.
Other Numbering System:
Other Numbering System NameOther Numbering System ID
AIAA Paper2022-1368
DOI:10.2514/6.2022-1368
Record Number:CaltechAUTHORS:20220210-928401000
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20220210-928401000
Official Citation:Takahiko Toki and Josette R. Bellan. "Influence of the Soret effect on binary-species boundary layers at high pressure," AIAA 2022-1368. AIAA SCITECH 2022 Forum. January 2022. https://doi.org/10.2514/6.2022-1368
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:113388
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:10 Feb 2022 22:25
Last Modified:10 Feb 2022 22:25

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