Temporal atomization of a transcritical liquid n-decane jet into oxygen

Poblador-Ibanez, Jordi; Sirignano, William A.

doi:10.1016/j.ijmultiphaseflow.2022.104130

Cited by 8 publications

(4 citation statements)

References 68 publications

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“…A summary of the physical and numerical modelling used by PS is provided here. The physical modelling considered in the studies of non-reactive, transcritical liquid injection by Poblador-Ibanez & Sirignano (2021, 2022 a ) is based on a low-Mach-number formulation particularised for a binary mixture of a fuel, , and an oxidiser species, (i.e. sum of mass fractions is ).…”

Section: Physical and Numerical Modellingmentioning

confidence: 99%

“…That is, the composition, density and viscosity of both fluids become similar (e.g. the gas phase becomes denser and the liquid viscosity drops to gas-like values) (Yang 2000; Poblador-Ibanez & Sirignano 2018, 2022 a ). As a result, surface tension decreases substantially and vanishes at the mixture critical point.…”

Section: Introductionmentioning

confidence: 99%

“…Following these works, Poblador-Ibanez & Sirignano (2022 a ) (hereafter PS) performed a temporal analysis of a three-dimensional planar liquid n -decane jet submerged in a hotter gaseous oxygen stream at transcritical conditions. Various ambient pressures are considered well above the critical pressure of n -decane while a two-phase interface is sustained.…”

Section: Introductionmentioning

confidence: 99%

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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: Physical and Numerical Modellingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Vorticity dynamics in transcritical liquid jet breakup

Poblador-Ibanez,

Sirignano,

Hussain

2023

J. Fluid Mech.

Self Cite

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show abstract

“…Computational fluid dynamics (CFD) models capable of simulating fuel injection under various operating conditions are thus essential for the design and optimization of fuel injection equipment (FIE). However, modeling of fuel injection and combustion remains a challenge due to the variety of length and time scales and the involved physical processes during the injection process [67,10,22,41,62]. The physical processes include in-nozzle cavitation, liquid atomization, phase-change, mixing, and chemical reactions.…”

Section: Introductionmentioning

confidence: 99%