Structure and dynamics of small-scale turbulence in vaporizing two-phase flows

Abstract Improving our fundamental understanding of multiphase turbulent flows will be beneficial for analyses of a wide range of industrial and geophysical processes. Herein, we investigate the topology of the local flow in vaporizing forced homogeneous isotropic turbulent two-phase flows. The inva...

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Autores principales:	Radouan Boukharfane, Aimad Er-raiy, Matteo Parsani, Nilanjan Chakraborty
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/245c99e15a064232b8e63f566727262d
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spelling	oai:doaj.org-article:245c99e15a064232b8e63f566727262d2021-12-02T16:23:42ZStructure and dynamics of small-scale turbulence in vaporizing two-phase flows10.1038/s41598-021-94334-x2045-2322https://doaj.org/article/245c99e15a064232b8e63f566727262d2021-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-94334-xhttps://doaj.org/toc/2045-2322Abstract Improving our fundamental understanding of multiphase turbulent flows will be beneficial for analyses of a wide range of industrial and geophysical processes. Herein, we investigate the topology of the local flow in vaporizing forced homogeneous isotropic turbulent two-phase flows. The invariants of the velocity-gradient, rate-of-strain, rate-of-rotation tensors, and scalar gradient were computed and conditioned for different distances from the liquid–gas surface. A Schur decomposition of the velocity gradient tensor into a normal and non-normal parts was undertaken to supplement the classical double decomposition into rotation and strain tensors. Using direct numerical simulations results, we show that the joint probability density functions of the second and third invariants have classical shapes in all carrier-gas regions but gradually change as they approach the carrier-liquid interface. Near the carrier-liquid interface, the distributions of the invariants are remarkably similar to those found in the viscous sublayer of turbulent wall-bounded flows. Furthermore, the alignment of both vorticity and scalar gradient with the strain-rate field changes spatially such that its universal behaviour occurs far from the liquid–gas interface. We found also that the non-normal effects of the velocity gradient tensor play a crucial role in explaining the preferred alignment.Radouan BoukharfaneAimad Er-raiyMatteo ParsaniNilanjan ChakrabortyNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-21 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Radouan Boukharfane Aimad Er-raiy Matteo Parsani Nilanjan Chakraborty Structure and dynamics of small-scale turbulence in vaporizing two-phase flows
description	Abstract Improving our fundamental understanding of multiphase turbulent flows will be beneficial for analyses of a wide range of industrial and geophysical processes. Herein, we investigate the topology of the local flow in vaporizing forced homogeneous isotropic turbulent two-phase flows. The invariants of the velocity-gradient, rate-of-strain, rate-of-rotation tensors, and scalar gradient were computed and conditioned for different distances from the liquid–gas surface. A Schur decomposition of the velocity gradient tensor into a normal and non-normal parts was undertaken to supplement the classical double decomposition into rotation and strain tensors. Using direct numerical simulations results, we show that the joint probability density functions of the second and third invariants have classical shapes in all carrier-gas regions but gradually change as they approach the carrier-liquid interface. Near the carrier-liquid interface, the distributions of the invariants are remarkably similar to those found in the viscous sublayer of turbulent wall-bounded flows. Furthermore, the alignment of both vorticity and scalar gradient with the strain-rate field changes spatially such that its universal behaviour occurs far from the liquid–gas interface. We found also that the non-normal effects of the velocity gradient tensor play a crucial role in explaining the preferred alignment.
format	article
author	Radouan Boukharfane Aimad Er-raiy Matteo Parsani Nilanjan Chakraborty
author_facet	Radouan Boukharfane Aimad Er-raiy Matteo Parsani Nilanjan Chakraborty
author_sort	Radouan Boukharfane
title	Structure and dynamics of small-scale turbulence in vaporizing two-phase flows
title_short	Structure and dynamics of small-scale turbulence in vaporizing two-phase flows
title_full	Structure and dynamics of small-scale turbulence in vaporizing two-phase flows
title_fullStr	Structure and dynamics of small-scale turbulence in vaporizing two-phase flows
title_full_unstemmed	Structure and dynamics of small-scale turbulence in vaporizing two-phase flows
title_sort	structure and dynamics of small-scale turbulence in vaporizing two-phase flows
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/245c99e15a064232b8e63f566727262d
work_keys_str_mv	AT radouanboukharfane structureanddynamicsofsmallscaleturbulenceinvaporizingtwophaseflows AT aimaderraiy structureanddynamicsofsmallscaleturbulenceinvaporizingtwophaseflows AT matteoparsani structureanddynamicsofsmallscaleturbulenceinvaporizingtwophaseflows AT nilanjanchakraborty structureanddynamicsofsmallscaleturbulenceinvaporizingtwophaseflows
_version_	1718384098465021952

Structure and dynamics of small-scale turbulence in vaporizing two-phase flows

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