Turbulent statistics and interface dynamics in a lubricated channel flow at R e τ = 100

Alati, Alessandro and De Angelis, Elisabetta ORCID: https://orcid.org/0000-0002-9183-2413 2023. Turbulent statistics and interface dynamics in a lubricated channel flow at R e τ = 100. Meccanica 58 (10) , pp. 1959-1971. 10.1007/s11012-023-01697-8

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Abstract

In this work we aim to study, through the use of Direct Numerical Simulations (DNS), the turbulent drag reduction (DR) that occurs in a lubricated channel during the transport of a fluid at a low Reynolds number. In this situation, one of the two fluids separates the second from the wall forming a thin layer in contact with it. In our configuration the thin lubricating layer is adjacent to one of the wall, which will be called lubricated side and and we consider the same density (ρ1=ρ2) for the two fluids, while for the viscosity ratio (λ=ν1/ν2) we will consider two different values: λ=1 and λ=0.5. Moreover to assess the role of the surface tension we have duplicated the two simulations at We number of We=0.055 and We=0.5. As expected the DR mechanism is strongly related to the viscosity ratio, in particular the flow rate increase when decreasing λ due to a relaminarization of the lubricated layer. Moreover, the parametric analysis on the effect of viscosity ratio and surface tension allows us to highlight very interesting modulations of the dynamics of the interface and of the turbulent kinetic budgets. To date, the latest studies in this area have been carried out using the Phase Field Method for the description of the interface. One of the scopes of the present study is to confirm and extend the existing results by exploring the dynamics of the flow with the use of the volume of fluid method.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Additional Information:	License information from Publisher: LICENSE 1: URL: http://creativecommons.org/licenses/by/4.0/, Type: open-access
Publisher:	Springer
ISSN:	0025-6455
Date of First Compliant Deposit:	24 October 2023
Date of Acceptance:	14 July 2023
Last Modified:	24 Oct 2023 09:15
URI:	https://orca.cardiff.ac.uk/id/eprint/163447

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