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Inter-species molecular attraction effect in the development of a two-species mixing layer

Banuti, Daniel and Bellan, Josette R. (2020) Inter-species molecular attraction effect in the development of a two-species mixing layer. In: AIAA Scitech 2020 Forum. American Institute of Aeronautics and Astronautics , Reston, VA, Art. No. 2020-1155. ISBN 978-1-62410-595-1.

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Simulations of fluid mixing occurring at high-pressures mandate the use of real-fluid equations of state to capture the effect of both intermolecular repulsive forces and attractive forces which are neglected in perfect gases. Dedicated mixing rules account for these forces by providing a generic mapping of the mixture state-space onto a pure fluid domain. However, the specific inter-species molecular forces depend on the particular characteristics of the molecular pairs under consideration, and typically require the knowledge of binary interaction coefficients kαβ . The impact of kαβ on a flow field is as of now unclear; further, kαβ is unknown for many molecular pairs and when unknown, set to be null. This study addresses the impact of kαβ on the temporal evolution of a real-fluid mixing layer and uses Direct Numerical Simulation (DNS) to explore this impact. The results show differences between augmented attraction (kαβ < 0) and diminished attraction (kαβ > 0), affecting both fluid dynamics and diffusion processes. Specifically, in a binary mixing layer, it is observed that augmented attraction leads to delayed transition and mixing layer growth, manifested in the momentum layer thickness. The fractal dimension as a measure of interface corrugation likewise shows a delayed development for augmented attraction. These results provide an hitherto undocumented mechanism affecting the development of mixing layers.

Item Type:Book Section
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URLURL TypeDescription
Banuti, Daniel0000-0002-5469-5704
Bellan, Josette R.0000-0001-9218-7017
Additional Information:© 2020 American Institute of Aeronautics and Astronautics. Published Online: 5 Jan 2020.
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Other Numbering System NameOther Numbering System ID
AIAA Paper2020-1155
Record Number:CaltechAUTHORS:20200113-083112418
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Official Citation:Inter-species molecular attraction effect in the development of a two-species mixing layer. Daniel Banuti and Josette R. Bellan. AIAA Scitech 2020 Forum. January 2020; doi: 10.2514/6.2020-1155
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:100661
Deposited By: Tony Diaz
Deposited On:13 Jan 2020 17:23
Last Modified:16 Nov 2021 17:55

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