Flow characteristics of a large-size pressure-atomized spray using DTV

Stevenin, C.; Tomas, Séverine; Vallet, A.; Amielh, Muriel; Anselmet, Fabien

doi:10.1016/j.ijmultiphaseflow.2016.05.004

Cited by 14 publications

(6 citation statements)

References 46 publications

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“…Following along the lines of Faeth and co-workers, later works focused on the region away from the nozzle, between the breakup of the jet liquid core and the jet dispersion zone, to study the polydisperse droplet population produced by atomization. A specific droplet tracking velocimetry (DTV) technique was used by Stevenin et al [7] to obtain original joint size-velocity measurements which include at the same time two velocity components and the diameter, covering a large size range, for each droplet. Insights into the turbulent multiphase flow common in the irrigation problem were derived that allow a comparison between the Reynolds stresses from the DTV and the turbulent kinetic energy from a turbulent Reynolds-averaged Navier-Stokes model.…”

Section: Introductionmentioning

confidence: 99%

Multimodal distributions of agricultural-like sprays: A statistical analysis of drop population from a pressure-atomized spray

2021

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This paper focuses on the statistical analysis of a droplet population produced by a pressure-atomized jet spray, laying in the second-wind-induced regime, far behind the nozzle. The droplet size and axial velocity derived from droplet tracking velocimetry measurements are shown to follow bimodal distributions and their modeling is tackled in the framework of turbulence and of combustion applications, respectively. In addition, the existence of subsets of droplets showing specific behaviors is brought to light from the analysis of the experimental droplet-size-velocity joint probability distribution function (PDF). Such subsets can be precisely defined using the properties of the size and axialvelocity distributions. Finally, the trend of the joint PDF is depicted due to a quadratic relationship which is derived in the context of combustion and shown to work here as well, far behind the nozzle.

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Section: Introductionmentioning

confidence: 99%

Multimodal distributions of agricultural-like sprays: A statistical analysis of drop population from a pressure-atomized spray

2021

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“…A significant advantage of the probe is that it not only delivers velocity and size distributions but can also be used to directly determine the dispersed phase characteristics of sprays, such as liquid fraction or droplet density. Various authors have utilized this advantage for the determination of the liquid fraction in their works, , and most of the utilizations of optical probes on sprays nowadays concern only the liquid fraction. Although the methodology exists, a few works have used the technique to measure droplet sizes or velocities, , especially in cases of gas absorption; the optical probe is rarely used to determine the droplet hydrodynamics in actual spray conditions.…”

Section: Introductionmentioning

confidence: 99%

Performance of a Monofiber Optical Probe in Determining the Droplet Size and Velocity in Spray Systems Compared with a High-Speed Camera

Wongwailikhit

Dietrich

Hébrard

et al. 2019

Ind. Eng. Chem. Res.

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The ability of a monofiber optical probe to characterize the hydrodynamics in spray systems was compared with that of a high-speed camera. Initially, the performance of both techniques was determined on the same droplets by using a syringe to produce a series of droplets. The optical probe gave a discrepancy according to the high-speed camera mainly due to the fact that the image processing of the high-speed camera photos determined the velocity from the movement of the droplet centroid while the optical probe determined the interfacial velocity from its collision with a droplet. The droplet oscillation occurred since the droplet formation process and droplet coalescence on the probe eventually led to the discrepancy. However, when comparing both techniques statistically, their results were not apparently different. Secondly, a full-cone industrial nozzle was used to provide the spray. The average velocities from the two characterization techniques were then in close agreement; the oscillation and coalescence effects became insignificant due to less dense, the smaller sizes and the higher velocities of the droplets. However, the collision on the probe tip was off center and the difference in size limits still caused the discrepancy, especially for the size distribution. Nevertheless, a major advantage of the optical probe is that it is capable to determine the droplet hydrodynamics in dense spray conditions and enable the direct determination of the local liquid fraction, one of the important characteristics of a spray system.

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“…This can be done through laser-pulse imaging and with high-speed cameras. It is worth noting that PIV and micro-PIV have been used in rotary bell atomization to measure the shaping air velocity and the droplet velocity in the flow field [30][31][32][33]. To our knowledge, there are no archival articles that reported the near cup droplet and ligament velocities using PIV methods.…”

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confidence: 99%

Study of Near-Cup Droplet Breakup of an Automotive Electrostatic Rotary Bell (ESRB) Atomizer Using High-Speed Shadowgraph Imaging

et al. 2018

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Electrostatic Rotary bell (ESRB) atomizers are used as the dominant means of paint application by the automotive industry. They utilize the high rotational speed of a cup to induce primary atomization of a liquid along with shaping air to provide secondary atomization and transport. In order to better understand the fluid breakup mechanisms involved in this process, high-speed shadowgraph imaging was used to visualize the edge of a serrated rotary bell at speeds varying between 5000 and 12,000 RPM and with a water flow rate of 250 ccm. A multi-step image processing algorithm was developed to differentiate between ligaments and droplets during the primary atomization process. The results from this experiment showed that higher bell speeds resulted in a 26.8% reduction in ligament and 22.3% reduction in droplet Sauter Mean Diameters (SMD). Additionally, the ligament (ranging from 40 to 400 µm) diameters formed bimodal distributions, while the droplet (ranging from 40 to 300 µm) diameters formed a normal distribution. Velocities were also measured using particle tracking velocimetry, in which size-dependent velocities could then be computed. Droplet velocities were affected more by rotational speed than droplet SMD, while ligaments were affected by other factors than the rotational speed and ligament SMD.

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Flow characteristics of a large-size pressure-atomized spray using DTV

Cited by 14 publications

References 46 publications

Multimodal distributions of agricultural-like sprays: A statistical analysis of drop population from a pressure-atomized spray

Multimodal distributions of agricultural-like sprays: A statistical analysis of drop population from a pressure-atomized spray

Performance of a Monofiber Optical Probe in Determining the Droplet Size and Velocity in Spray Systems Compared with a High-Speed Camera

Study of Near-Cup Droplet Breakup of an Automotive Electrostatic Rotary Bell (ESRB) Atomizer Using High-Speed Shadowgraph Imaging

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