Numerical approaches and analysis of spray characteristics for pressuriser nozzles

Lan, Zhike; Zhu, Dahuan; Tian, Wenxi; Su, Guanghui; Qiu, Suizheng

doi:10.1002/cjce.21911

Cited by 5 publications

(1 citation statement)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The VOF method proposed by Hirt et al [28], is a linear interpolation method for describing the motion of the continuous phase and the coupling between the continuous phase and dispersed phase [29,30]. It can reconstruct the interface without changing the mesh and trace the gas-liquid two-phase flow interface accurately in the nozzle, and then the coupling problem between any two incompressible fluids is solved.…”

Section: Equations and Mathematical Expressions 31 Mathematical Modelsmentioning

confidence: 99%

Influence of Nozzle Orifice Shape on the Atomization Process of Si3N4 in a Dry Granulation Process

Yu¹,

Zhang²,

Xu³

et al. 2021

Fluid Dynamics &Amp; Materials Processing

View full text Add to dashboard Cite

In order to reveal the intrinsic fluid-dynamic mechanisms of a pressure-swirl nozzle used for Si 3 N 4 dry granulation, and effectively predict its external spray characteristics, the dynamics of air-atomized liquid two-phase flow is analyzed using a VOF (Volume of Fraction) method together with the modified realizable k-ε turbulence model. The influence of nozzle orifice shape on velocity distribution, pressure distribution is studied. The results show that the pressure difference in a convergent conical nozzle is the largest with a hollow air core being formed in the nozzle. The corresponding velocity of atomized liquid at nozzle orifice is the largest. Using a self-designed atomization experiment platform, the velocity and pressure of atomized liquid and the spray cone angle are measured for three nozzles with different orifice shapes. The micro-morphology of Si 3 N 4 particles is also determined. These data confirm the correctness of numerical simulation. Considering atomization performance of the nozzle, the contraction conical nozzle is more suitable for the atomization of Si 3 N 4 in practical production based on the dry granulation approach.

show abstract

Section: Equations and Mathematical Expressions 31 Mathematical Modelsmentioning

confidence: 99%

Influence of Nozzle Orifice Shape on the Atomization Process of Si3N4 in a Dry Granulation Process

Yu¹,

Zhang²,

Xu³

et al. 2021

Fluid Dynamics &Amp; Materials Processing

View full text Add to dashboard Cite

show abstract

A computational study of an atomizing liquid sheet

2015

View full text Add to dashboard Cite

Linear instability predictions of liquid sheets injected into a gas medium are well established in the literature. These analyses are often used in Lagrangian-Eulerian spray simulations, a prominent simulation method, to model the dynamics occurring in the near-nozzle region. In the present work, these instability predictions are re-examined by first generalizing the treatment of interfacial conditions and related assumptions with a two-phase Orr-Sommerfeld (OS) system, and second, by employing highly resolved-Volume-of-Fluid (VoF) simulations. After presenting some validation exercises for both the VoF and OS solvers, the OS predictions are compared to earlier studies from the literature leading to reasonable agreement in the limit as the boundary layer thickness tends to zero. Results from VoF simulations of liquid sheet injection are used to characterize the range of scales of the liquid structures immediately before atomization. The mean value in this range is found to be approximately two to three orders of magnitude larger than the corresponding predictions from previous studies. A two-phase mixing layer under the same physical conditions is used to examine this disparity, revealing that within the linear regime, relatively good agreement exists between the VoF and OS predicted instability mechanisms. However, the most unstable mode in the linear regime is too small to cause a fracture or atomization of the liquid sheet and hence cannot be directly responsible for the atomization. The generation of a much larger mode, which emerges well beyond the linear regime, is the one causing breakup.

show abstract

Numerical study and experimental validation: A portioned calculation method for a large atomization field

Chen,

Zhang,

Wang

et al. 2024

Physics of Fluids

View full text Add to dashboard Cite

Atomization and sprays are widely used in industry and agriculture. An appropriate atomization simulation method is essential in analyzing the liquid film-breaking process and atomization performance, especially in large-scale atomization field calculations. This study innovatively proposes a portioned method that combines existing fundamental atomization calculation models to balance computational accuracy and speed, finally achieving a full-scale numerical study of large atomization fields. This study employs the volume of fluid (VOF) model to measure the two-phase flow in the inner flow field and applies the discrete particle model (DPM) to analyze droplet behavior in the far-atomization field. In the near-atomization field, the VOF-to-DPM method connects the nozzle with the jet space, providing an effective numerical simulation of the liquid film formation and droplet breakup processes. Additionally, experiments on atomization using a pressure-swirl nozzle at different flow rates were conducted. Experimental data, such as atomization cone angle, flow distribution, and droplet particle size distribution, were obtained, and numerical calculations were performed using the large atomization field partitioned calculation model. The simulation results are utilized to explain the mechanisms of liquid film disintegration, while the experimental results are employed to validate the accuracy of the numerical model. The comparison revealed that the calculated results of the partitioned simulation approach align well with the experimental data. The maximum error in flow characteristics is 9.53%, in atomization cone angle is 6.16%, and in flow distribution is 3.67%, and there is a good agreement in particle size distribution with a maximum error of 17.58% in Sauter mean diameter, validating the accuracy of the portioned calculation method for large atomization fields.

show abstract

Numerical approaches and analysis of spray characteristics for pressuriser nozzles

Cited by 5 publications

References 28 publications

Influence of Nozzle Orifice Shape on the Atomization Process of Si3N4 in a Dry Granulation Process

Influence of Nozzle Orifice Shape on the Atomization Process of Si3N4 in a Dry Granulation Process

A computational study of an atomizing liquid sheet

Numerical study and experimental validation: A portioned calculation method for a large atomization field

Contact Info

Product

Resources

About