Numerical Study of Consecutive Drop/Wall Impacts Using Smoothed Particle Hydrodynamics

Subedi, Kshitiz Kumar; Kong, Song‐Charng; Kweon, Chol-Bum

doi:10.1016/j.ijmultiphaseflow.2022.104060

Cited by 8 publications

(5 citation statements)

References 43 publications

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“…The film gets deposited on the wall, spreads to a maximum diameter, and then recoils. This phenomenon is similar to the outcomes seen in dropwall interactions at wall temperatures below the liquid's saturation temperature [95]. The impingement of the second droplet on the thin wall film results in the splashing of secondary droplets from the film.…”

Section: Effect Of Droplet Diametersupporting

confidence: 74%

Particle-based approach to model fuel droplet impact and thermal spray coating processes

Subedi

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Section: Effect Of Droplet Diametersupporting

confidence: 74%

Particle-based approach to model fuel droplet impact and thermal spray coating processes

Subedi

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“…A numerical study was conducted to characterize the impact of consecutive droplets on a wall whose temperature was lower than the droplet's saturation temperature, and the effects of impingement frequency were presented [20]. It was found that the effect of impingement frequency is seen as a kinematic discontinuity among the spreading lamellae, film formation, and rapidness of impact, and that the K parameter provides a better representation of the splashing dynamics.…”

Section: K Oh Rementioning

confidence: 99%

“…The present SPH method has been validated for the impacts of a single drop on the wall [10,26,27,29,30]. The present method has also been validated for crown rim propagation [20] against the experimental studies for the droplet train impact of ethanol [17] and Novec HFE-7100 [31] at different impingement frequencies. The wall temperatures used in these experimental works are lower than the saturation temperature of the liquid drop.…”

Section: A Impact Outcomesmentioning

confidence: 99%

“…The wall temperatures used in these experimental works are lower than the saturation temperature of the liquid drop. The previous study [20] also characterizes the effects of the impingement frequency, droplet diameter, and ambient pressure on the impact outcome using n-heptane for wall temperature lower than the saturation temperature of the liquid drop. To further characterize the effects of wall temperature, the present study is focused on the impact of a stream of n-heptane drops at five different are presented here for brevity.…”

Section: A Impact Outcomesmentioning

confidence: 99%

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Numerical study on the Leidenfrost behavior of a droplet stream impinging on a heated wall

Subedi

Kong

2022

Phys. Rev. E

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A detailed understanding of drop-wall interactions at high-temperature and high-pressure conditions can help optimize fuel injection, engine operation, and material design. The existing formulas developed for simulating drop-wall interactions are either valid only for a small range of operating conditions or based on the single-drop impact scenarios neglecting the effect of the non-stationary liquid film on the wall. The Leidenfrost temperature is a critical parameter in determining the impact outcome and needs to be considered in characterizing the impact behavior at extreme conditions. In this study, the Smoothed Particle Hydrodynamics (SPH) method, a Lagrangian-based method, is used to study the impact of an n-heptane droplet stream on a heated wall near and above the Leidenfrost temperature. The impingement frequency and wall temperature are varied to understand the impact dynamics and outcomes. Visualizations of the impact outcomes are provided to explain the interaction between the succeeding drops and the liquid film created by the preceding drops. To further characterize the shift in the Leidenfrost behaviors and the corresponding impact outcomes caused by the change in ambient pressure, simulations are also conducted at the corresponding fluid states for ambient pressures of 5 bar and 20 bar. Results show that the increase in ambient pressure impedes splashing and the film is concentrated inwards near the impingement point.

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“…In addition, Cui et al (2019) observed that a thicker liquid film could decrease the crown diameter and a smaller impact angle could suppress upward splashing with a three-dimensional (3D) SPH framework. Moreover, Subedi et al (2022) conducted the impact of consecutive droplets on a wall using the SPH method. These works have demonstrated the feasibility of SPH method in modeling the evaporation process of a droplet impact on a liquid film.…”

Section: Introductionmentioning

confidence: 99%

The simulation of droplet impact on liquid film evaporation in horizontal falling film evaporator based on smoothed particle hydrodynamics

Fan,

Ma,

et al. 2024

HFF

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Purpose In this paper, the complex flow evaporation process of droplet impact on the liquid film in a horizontal falling film evaporator is numerically studied based on smoothed particle hydrodynamics (SPH) method. The purpose of this paper is to present the mechanism of the water treatment problem of the falling film evaporation for the high salinity mine water in Xinjiang region of China. Design/methodology/approach To effectively characterize the phase transition problem, the particle splitting and merging techniques are introduced. And the particle absorbing layer is proposed to improve the nonphysical aggregation phenomenon caused by the continuous splitting of gas phase particles. The multiresolution model and the artificial viscosity are adopted. Findings The SPH model is validated qualitatively with experiment results and then applied to the evaporation of the droplet impact on the liquid film. It is shown that the larger single droplet initial velocity and the smaller single droplet initial temperature difference between the droplet and liquid film improve the liquid film evaporation. The heat transfer effect of a single droplet is preferable to that of multiple droplets. Originality/value A multiphase SPH model for evaporation after the droplet impact on the liquid film is developed and validated. The effects of different factors on liquid film evaporation, including single droplet initial velocity, single droplet initial temperature and multiple droplets are investigated.

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Numerical Study of Consecutive Drop/Wall Impacts Using Smoothed Particle Hydrodynamics

Cited by 8 publications

References 43 publications

Particle-based approach to model fuel droplet impact and thermal spray coating processes

Particle-based approach to model fuel droplet impact and thermal spray coating processes

Numerical study on the Leidenfrost behavior of a droplet stream impinging on a heated wall

The simulation of droplet impact on liquid film evaporation in horizontal falling film evaporator based on smoothed particle hydrodynamics

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