A volume-of-fluid method for variable-density, two-phase flows at supercritical pressure

Poblador-Ibanez, Jordi; Sirignano, William A.

doi:10.1063/5.0086153

Cited by 17 publications

(10 citation statements)

References 110 publications

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“…a uniform mesh size of ). A comprehensive summary of the physical and numerical modelling is provided in § 3 and is based on the work by Poblador-Ibanez & Sirignano (2022 b ). There, the grid convergence properties of the model are discussed, showing the impact on the deformation and vaporisation of the liquid phase.…”

Section: Flow Configurationmentioning

confidence: 99%

“…Thus, the mesh might become insufficient to resolve the small scales after some time. Poblador-Ibanez & Sirignano (2022 b ) noted that the present mesh resolution is adequate for our analysis, capturing the early deformation of lobes and ligaments with minimal differences between different mesh resolutions (i.e. , , and ).…”

Section: Flow Configurationmentioning

confidence: 99%

“…Compressibility arises from species and thermal mixing at elevated pressures, but pressure variations in the thermodynamic model are neglected. The governing equations for mass, momentum, species transport and energy: are solved within each phase and satisfy the corresponding matching conditions across the moving liquid–gas interface (Poblador-Ibanez & Sirignano 2022 b ). That is, mass, momentum and energy balance relations across the interface are ensured.…”

Section: Physical and Numerical Modellingmentioning

confidence: 99%

“…selected species, temperature, pressure, computational domain). Then, § 3 summarises the physical modelling and numerical techniques used in the computations, for which a detailed description can be found in Poblador-Ibanez & Sirignano (2022 b ). The vortex identification method of Yao & Hussain (2018) is reviewed in § 4, and best practices are presented for its implementation in the post-processing of two-phase computations with a sharp interface.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Vorticity dynamics in transcritical liquid jet breakup

Poblador-Ibanez,

Sirignano,

Hussain

2023

J. Fluid Mech.

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A transcritical domain with a sharp two-phase interface may exist during the early times of liquid hydrocarbon fuel injection at supercritical pressure. Thus, two-phase dynamics are sustained before substantial heating of the liquid and drive the early three-dimensional deformation and atomisation. A recent study of a transcritical liquid jet showed distinct deformation features caused by interface thermodynamics, low surface tension and intraphase diffusive mixing. In the present work, the compressible vortex identification method $\lambda _\rho$ is used to study the vortex dynamics in a cool liquid n-decane transcritical jet surrounded by a hotter oxygen gaseous stream at supercritical pressures. The relationship between vortical structures and the liquid surface evolution is detailed, along with the vorticity generation mechanisms, including variable-density effects. The roles of hairpin and roller vortices in the early deformation of lobes, the layering and tearing of liquid sheets and the formation of fuel-rich gaseous blobs are analysed. At these high pressures, enhanced intraphase mixing and ambient gas dissolution affect the local liquid structures (i.e. lobes). Thus, liquid breakup differs from classical sub-critical atomisation. Near the interface, liquid density and viscosity drop by up to 10 % and 70 %, respectively, and the liquid is more easily affected by the vortical motion (e.g. liquid sheets wrap around vortices). Despite the variable density, compressible vorticity generation terms are smaller than the vortex stretching and tilting. Layering traps and aligns the vortices along the streamwise direction while mitigating the generation of new rollers.

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Section: Flow Configurationmentioning

confidence: 99%

Section: Flow Configurationmentioning

confidence: 99%

Section: Physical and Numerical Modellingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Vorticity dynamics in transcritical liquid jet breakup

Poblador-Ibanez,

Sirignano,

Hussain

2023

J. Fluid Mech.

Self Cite

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show abstract

“…First, section 2 describes the transcritical configurations of PS (e.g., species, temperature, pressure, computational domain). Then, section 3 summarises the physical modelling and numerical techniques used in the computations, for which a detailed description can be found in Poblador-Ibanez and Sirignano (2022b). The vortex identification method λ ρ of Yao and Hussain (2018) is reviewed in section 4, and best practices are presented for its implementation in the post-processing of two-phase computations with a sharp interface.…”

Section: Introductionmentioning

confidence: 99%

Vorticity dynamics in transcritical liquid jet breakup

Poblador-Ibanez¹,

Sirignano²,

Hussain³

2023

Preprint

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Contrary to common assumptions, a transcritical domain exists during the early times of liquid hydrocarbon fuel injection at supercritical pressure. A sharp two-phase interface is sustained before substantial heating of the liquid. Thus, two-phase dynamics has been shown to drive the early three-dimensional deformation and atomisation. A recent study of a transcritical liquid jet shows distinct deformation features caused by interface thermodynamics, low surface tension, and intraphase diffusive mixing. In the present work, the vortex identification method λ ρ , which considers the fluid compressibility, is used to study the vortex dynamics in a cool liquid n-decane transcritical jet surrounded by a hotter oxygen gaseous stream at supercritical pressures. The relationship between vortical structures and the liquid surface evolution is detailed, along with the vorticity generation mechanisms, including variable-density effects. The roles of hairpin and roller vortices in the early deformation of lobes, the layering and tearing of liquid sheets, and the formation of fuel-rich gaseous blobs are analysed. At these high pressures, enhanced intraphase mixing and ambient gas dissolution affect the local liquid structures (i.e., lobes). Thus, liquid breakup differs from classical sub-critical atomisation. Near the interface, liquid density and viscosity drop by up to 10% and 70%, respectively, and the liquid is more easily affected by the vortical motion (e.g., liquid sheets wrap around vortices). Despite the variable density, compressible vorticity generation terms are smaller than the vortex stretching and tilting. Layering traps and aligns the vortices along the streamwise direction while mitigating the generation of new rollers.

show abstract