Investigation of interface deformation dynamics during high-Weber number cylindrical droplet breakup

Kaiser, J.W.J.; Winter, Josef M.; Adami, Stefan; Adams, Nikolaus A.

doi:10.1016/j.ijmultiphaseflow.2020.103409

Cited by 27 publications

(15 citation statements)

References 42 publications

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“…Thus, capillary disintegration of liquid sheets cannot be resolved by the simulations. Nevertheless, as the comparison with other experimental and numerical data in [21] suggests, the early stages of the breakup process are captured well by the simulations.…”

Section: Application Examplessupporting

confidence: 69%

“…It has to be able to capture all relevant physical effects, the resulting instability patterns, and their interactions. In [21], we investigate the interface deformation dynamics in the SIE regime for a water column interacting with an ambient flow field. We highlight the importance to accurately resolve pressure waves near the phase interface and their interplay with instability-driven interfacial waves.…”

Section: Aerobreakupmentioning

confidence: 99%

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High‐order modeling of interface interactions using level sets

et al. 2022

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Most technological advancements in medicine, process and energy engineering, life and food science, mobility and environmental engineering involve mastering fluid mechanical effects. In particular, compressible flow physics including shockwaves and phase‐interface interactions exhibit multi‐scale phenomena spanning several orders of magnitude upwards from nanometer and nanosecond time scales. Clearly, detailed analysis of such effects is impossible by means of experimental techniques. On the contrary, numerical modeling and simulations allow to capture the aforementioned mechanisms and provide non‐invasive access to any quantity of interest. Yet, the complex fluid physics require powerful computational methods utilizing recent advancements for high‐order schemes. In this work, we provide an overview on latest high‐order low‐dissipation schemes using level sets to model discontinuous phase‐interface interactions.

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Section: Application Examplessupporting

confidence: 69%

Section: Aerobreakupmentioning

confidence: 99%

High‐order modeling of interface interactions using level sets

et al. 2022

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“…where the fractal dimension (D f ) can vary from 1 to 3, corresponding respectively to a chain-like structure and spherical aggregates, and the Weber number (W e ) is the ratio of the input kinetic energy to the interface energy (Equation ( 11)) [28,29]:…”

Section: Wind Erosion Emission Modelmentioning

confidence: 99%

Emission of Fine Dust from Open Storage of Industrial Materials Exposed to Wind Erosion

et al. 2022

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A physical-mathematical model has been designed to estimate the emission of dust from the surface of granular materials exposed to wind erosion. The emission model implements the Monte Carlo probabilistic approach, which for a given wind velocity (i.e., shear stress velocity) ascribes the probability of saltation to the particle aggregates composing the erodible surface and calculates the emission of dust aerosol based on the main laws governing the physics of wind-blown particles. The article discusses the application of the emission code to the surfaces of two metal sulphides (PbS and ZnS), which are typically stored in stockpiles in the open yards of industrial plants that operate in the commodity sector, to be used as raw materials for the production of lead and zinc (non-ferrous metals). The results of the simulation were found to be in agreement with the indication provided by the technical literature about the emission potential of the two metal sulphides. The emission model hereby proposed intends to provide an analytical integration to the experimental and empirical Emission Factors (EF) already suggested by the technical and scientific literature about industrial wind erosion.

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“…Hence, the present axisymmetric geometry can adequately predict the coherent droplet deformation and fragmentation with minor limitations regarding the produced fragments' motion due to the absence of the stochastic character of a fully developed turbulent field. At the same time, key numerical studies in the literature [26], [36], [42], [43], [39] exclude the consideration of turbulence effects, without a limitation in capturing the dominant macroscopic phenomena of the aerobreakup evolution, while DNS studies [26], [46] do not report any significant difference or previously unrevealed mechanisms in the flow field due to the resolved turbulence. Consequently, despite the discussed limitations, the utilized 2D axisymmetric geometry with one cell thickness in the azimuthal direction is an acceptable compromise between an adequate turbulence model and a viable computational cost.…”

Section: B Problem Definition and Simulation Setupmentioning

confidence: 99%

“…Yang and Peng [38] examined the effect of viscosity on the deformation of the liquid column, using an adaptive mesh refinement (AMR) method for higher spatial resolution. More recently, Kaiser et al [39] performed high-resolution simulations with adaptive mesh refinement for the benchmark case of Mach number 1.47, previously simulated by Chen [32], Meng and Colonius [36], and Yang and Peng [38], with an emphasis put on the more accurate prediction of the shock wave dynamics, observed in the experiments of Igra and Takayama [40], [41]. Overall, the two-dimensional simulations of the shear-induced droplet breakup in the literature focus on the capturing of the early stages of breakup and the shock wave dynamics, without investigating the later stages of fragmentation and mist development.…”

Section: Introductionmentioning

confidence: 98%

Droplet aerobreakup under the shear-induced entrainment regime using a multiscale two-fluid approach

Nykteri

Gavaises

2021

Phys. Rev. Fluids

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A droplet exposed to a high-speed gas flow is subject to a rapid and violent fragmentation, dominated by a widespread mist of multiscale structures that introduce significant complexities in numerical studies. The present work focuses on capturing all stages of the aerodynamic breakup of a waterlike droplet imposed by three different intensity shock waves, with Mach numbers of 1.21, 1.46, and 2.64, under the shear-induced entrainment regime. The numerical investigation is conducted within a physically consistent and computationally efficient multiscale framework, using the Σ-Υ two-fluid model with dynamic local topology detection. Overall, the breakup of the deforming droplet and the subsequent dispersion of the produced mist show good agreement with available experimental studies in the literature. The major features and physical mechanisms of breakup, including the incident shock wave dynamics and the vortices development, are discussed, and verified against the experiments and the theory. While the experimental visualizations inside the dense mist are restricted by the capabilities of the diagnostic methods, the multiscale two-fluid approach provides insight into the mist dynamics and the distribution of the secondary droplets under different postshock conditions.

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Investigation of interface deformation dynamics during high-Weber number cylindrical droplet breakup

Cited by 27 publications

References 42 publications

High‐order modeling of interface interactions using level sets

High‐order modeling of interface interactions using level sets

Emission of Fine Dust from Open Storage of Industrial Materials Exposed to Wind Erosion

Droplet aerobreakup under the shear-induced entrainment regime using a multiscale two-fluid approach

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