Eulerian–Lagrangian modeling of spray G atomization with focus on vortex evolution and its interaction with cavitation

Liu, Wenchuan; Tang, Jiren; Lu, Yiyu; Xie, Chengli; Liu, Qi; Lee, Chia-Fon

doi:10.1016/j.apm.2022.01.017

Cited by 20 publications

(4 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The development and evolution of turbulent vortex structures within GDI nozzles have a significant impact on the characteristics of spray discharge and atomization. [29][30][31] Therefore, under different cavitation number conditions, the Q-criterion is employed to extract the three-dimensional turbulent vortex structures within the nozzle. 32 The primary objective of the Q-criterion is to identify vortical structures within a fluid.…”

Section: Resultsmentioning

confidence: 99%

A comprehensive investigation on the internal flow and outflow characteristics of GDI elliptical divergent nozzles

Yu,

Yin,

Chen

et al. 2024

International Journal of Engine Research

View full text Add to dashboard Cite

The substantial demand for enhanced combustion efficiency and achieving near-zero emissions in GDI engines has spurred the introduction of a novel approach employing elliptical divergent nozzle spray technology. This innovative method, which marries the elliptical shape with a divergent nozzle, not only elevates downstream atomization quality but also mitigates nozzle tip wetting. Nevertheless, there exists a dearth of documented research regarding the internal flow and outflow characteristics related to the atomization potential of elliptical divergent nozzles. Numerical investigations have been carried out to scrutinize alterations in the three-dimensional cavitation morphology, the dispersion of turbulent vortex structures, and the nozzle exit flow parameters across a range of cavitation number conditions for both circular and elliptical divergent nozzles. The research findings demonstrate that the cavitation intensity of the elliptical divergent nozzle consistently surpasses that of the circular divergent nozzle. Also, the elliptical divergent nozzle consistently exhibits a greater number of turbulent vortex structures compared to the circular divergent nozzle across all cavitation number conditions. Additionally, as the cavitation number decreases, the difference in turbulence vorticity magnitude between the exits of the circular and elliptical divergent nozzles gradually increases. Furthermore, the elliptical diverging orifices are more susceptible to cavitation compared to their circular counterparts. The elliptical divergent nozzle outperforms the circular nozzle with a substantial 24.6% increase in exit velocity, especially at a cavitation number of 1.016.

show abstract

Section: Resultsmentioning

confidence: 99%

A comprehensive investigation on the internal flow and outflow characteristics of GDI elliptical divergent nozzles

Yu,

Yin,

Chen

et al. 2024

International Journal of Engine Research

View full text Add to dashboard Cite

show abstract

“…Focusing our analysis on effects of the TGE on Caucasian river plumes, we used the Lagrangian method [88] and daily archive tracking water properties (temperature, salinity, velocity, and density) along the particle trajectories. To track the river waters trapped in an eddy and quantify their degree of leakiness, we performed a passive tracer experiment with Lagrangian particles initialized in river discharge sites.…”

Section: Discussionmentioning

confidence: 99%

Mesoscale Eddies in the Black Sea and Their Impact on River Plumes: Numerical Modeling and Satellite Observations

2022

View full text Add to dashboard Cite

The Northeast Caucasian Current (NCC) is the northeastern part of the cyclonic Rim Current (RC) in the Black Sea. As it sometimes approaches the narrow shelf very closely, topographically generated cyclonic eddies (TGEs) can be triggered. These eddies contribute to intense, along- and cross-shelf transport of trapped water with enhanced self-cleaning effects of the coastal zone. Despite intense studies of eddy dynamics in the Black Sea, the mechanisms of the generation of such coastal eddies, their unpredictability, and their capacity to capture and transport impurities are still poorly understood. We applied a 3-D low-dissipation model DieCAST/Die2BS coupled with a Lagrangian particle transport model supported by analysis of optical satellite images to study generation and evolution of TGEs and their effect on river plumes unevenly distributed along the northeastern Caucasian coast. Using the Furrier and wavelet analyses of kinetic energy time series, it was revealed that the occurrence of mesoscale TGEs ranges from 10 up to 50 days. We focused on one particular isolated anticyclonic TGE that emerged in late fall as a result of instability of the RC impinging on the abrupt submarine area adjoining the Pitsunda and Iskuria capes. Being shed, the eddy with a 30-km radius traveled along the coast as a coherent structure during ~1.5 months at a velocity of ~3 km/day and vertical vorticity normalized by the Coriolis parameter ~(0.1 ÷ 1.2). This eddy captured water from river plumes localized along the coast and then ejected it to the open sea, providing an intense cross-shelf transport of riverine matter.

show abstract

“…However, the real-time transparency of the water jet rock-breaking process is low, and the flow field structure of the water jet and the damage process of the rock are very complicated. 13 Leading to the actual rock-breaking mechanism is controversially discussed in the previous studies. 14 Jiang et al 15 used numerical simulation methods to model the rock fragmentation through jet impinging and studied the rock fragmentation zone and the fracture formation as well as other failure mechanisms.…”

Section: Introductionmentioning

confidence: 99%

“…Considering data and findings from previous studies, we recognized that the rock damage threshold of different rock pressures is directly related to the failure mode of the given rock. However, the real-time transparency of the water jet rock-breaking process is low, and the flow field structure of the water jet and the damage process of the rock are very complicated . Leading to the actual rock-breaking mechanism is controversially discussed in the previous studies .…”

Section: Introductionmentioning

confidence: 99%

Fracture Characteristics and Failure Modes of Coal, Sandstone, and Shale Impacted by Water Jet under True Triaxial Conditions

Gao

Zhou

et al. 2022

Energy Fuels

View full text Add to dashboard Cite

In recent years, the water jet technology has become an important means for processing unconventional oil and gas resources. With the exploitation of resources to the deep development, the study of the fracture characteristics and failure modes of true triaxial water jet rock breaking is of major importance for the application of the water jet technology in deeper crustal levels. We selected three typical unconventional gas reservoirs, coal, sandstone, and shale, as samples for our rockbreaking experiments of water jet under true triaxial conditions. On the basis of the rock failure criterion considering triaxial stress, we establish the rock-breaking energy criterion of water jet under true triaxial conditions and study the rock-breaking mode of water jet under true triaxial conditions. Experimental results document that the true triaxial water jet rock-breaking energy criterion can predict the rock-breaking threshold pressure well. With the increase of triaxial stress, the breaking threshold pressure of coal, sandstone, and shale increased by 92, 38, and 37%, respectively. Under true triaxial conditions, the failure characteristics and failure modes of different rocks impacted by water jet differ significantly. The water wedge action of coal is weakened, the volume of the crushing pit was reduced by 90%, and the failure is mainly caused by the shear failure that is induced by jet pressure. Sandstone is still dominated by the denudation failure that is caused by jet, but the degree of destruction is weakened, and the volume of the crushing pit was reduced by 38%. The shale has changed from tensile failure that is dominated by stress waves to erosion pit failure that is dominated by shear action. The results of the study provide a reference for the application of the water jet technology for the exploitation of unconventional oil and gas resources in deeper crust levels.

show abstract

Eulerian–Lagrangian modeling of spray G atomization with focus on vortex evolution and its interaction with cavitation

Cited by 20 publications

References 57 publications

A comprehensive investigation on the internal flow and outflow characteristics of GDI elliptical divergent nozzles

A comprehensive investigation on the internal flow and outflow characteristics of GDI elliptical divergent nozzles

Mesoscale Eddies in the Black Sea and Their Impact on River Plumes: Numerical Modeling and Satellite Observations

Fracture Characteristics and Failure Modes of Coal, Sandstone, and Shale Impacted by Water Jet under True Triaxial Conditions

Contact Info

Product

Resources

About