Numerical Study of Transient Deformation and Drag Characteristics of a Decelerating Droplet

Qu, Qiulin; Ma, Pingchang; Liu, Peiqing; Li, Shaowei; Agarwal, Ramesh K.

doi:10.2514/1.j054286

Cited by 10 publications

(3 citation statements)

References 23 publications

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“…Besides, nearly all of the studies involving droplet internal flow were conducted by numerical methods. Although several researchers [7][8][9][10] elucidated the internal flow pattern, they concentrated on cases with low Weber numbers We. In shock-induced droplet breakup cases, where the inertial effect dominates the flow, the droplet internal flowfield has been totally overlooked.…”

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confidence: 99%

Numerical Study on Liquid Droplet Internal Flow Under Shock Impact

et al. 2018

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The establishment of an internal flowfield inside a single water droplet subjected to shock-wave impact is numerically and theoretically investigated. The main focus is on the description of the droplet internal flow pattern, which is believed to be one of the dominant factors in initial droplet deformation. The droplet internal flow pattern holds steady for quite a long time after the incident shock passage, and a saddle point is observed for the first time. Accordingly, the saddle point inside the droplet flow is used as a characteristic point to describe the internal flow. Cases of different incident shock strengths are tested, and a theoretical prediction is proposed to delineate the correlation between the saddle point steady position and the strength of the incident shock wave. The numerical cases are found to be in good agreement with the prediction. The present study helps to complete the understanding of the overall droplet aerobreakup phenomenon.

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confidence: 99%

Numerical Study on Liquid Droplet Internal Flow Under Shock Impact

et al. 2018

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“…The effects of the shapes (sphere, disk and cylinder) of particles [40,41], the sphericity [42] were taken into account for the determination of the drag coefficient. For multiphase flows in Eulerian approaches, surface tension effect [43] at the gas/liquid interfaces and the deformation of the bubbles [44] in liquid phase or the droplet in the gas phase were studied.…”

Section: Simulation Approachmentioning

confidence: 99%

Modelling the complex evaporated gas flow and its impact on particle spattering during laser powder bed fusion

Jakumeit

Zheng

Laqua

et al. 2021

Additive Manufacturing

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“…For spherical droplet that is accelerating or decelerating in the gas, in [30] and [31], a correlation to C d was found based on conicaldriver shock tube experiment results, and it was dependent on a non-dimensional relativeacceleration parameter. For deformed transient droplets, the C d correlation can be found in [25], where the ANSYS Fluent was used to solve the Navier-Stokes equations.…”

Section: Introductionmentioning

confidence: 99%

The effect of droplet deformation and internal circulation on drag coefficient

Lin¹,

Palmore²

2022

Preprint

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The current study uses numerical approaches to investigate the effect of droplet deformation and internal circulation on droplet dynamics. Although droplet drag is a classical area of study, there are still theoretical gaps in understanding the motion of large droplets. In applications like spray combustion, droplets of various sizes are generated and move with the flow. Large droplets tend to deform in the flow, and have complex interactions with the flow because of this deformation. To better model spray, the physical understanding of droplets need to be improved.Under spray conditions, droplets are subjected to a high temperature and pressure environment, and the coupling between liquid and gas is enhanced. Therefore, the deformation and internal circulation will affect droplet drag coefficient more significantly than in atmospheric conditions.To study the mechanism on how droplet shape and internal circulation influence droplet dynamics, we will use direct numerical simulation (DNS) to simulate a droplet falling at its terminal velocity in high pressure air. An in-house code developed for interface-capturing DNS of multiphase flows will be employed for the simulation. The drag coefficient is calculated, and the results are consistent with existing literature for slightly deformed droplets. The results show that the drag coefficient is directly related to the droplet deformation and droplet internal circulation. The paper also develops a theory to account the effect of Weber number and liquid/gas properties in droplet deformation.

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Numerical Study of Transient Deformation and Drag Characteristics of a Decelerating Droplet

Cited by 10 publications

References 23 publications

Numerical Study on Liquid Droplet Internal Flow Under Shock Impact

Numerical Study on Liquid Droplet Internal Flow Under Shock Impact

Modelling the complex evaporated gas flow and its impact on particle spattering during laser powder bed fusion

The effect of droplet deformation and internal circulation on drag coefficient

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