Interaction of a polydisperse spray with vortices

Lacour, Corine; Durox, Daniel; Ducruix, Sébastien; Massot, Marc

doi:10.1007/s00348-011-1050-1

Cited by 24 publications

(13 citation statements)

References 29 publications

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“…ILIDS can measure instantaneous droplet concentration conditional on droplet size. This feature is important to study preferential accumulation of droplets of different sizes [97]. Also, ILIDS is capable of mea- suring the inter-droplet-distance conditioned on droplet size, which is a quantity of significance for measurement of the two-point droplet velocity correlation as well as the radial distribution function (RDF) for the study clustering of droplets [89].…”

Section: Dilute Spray Measurementsmentioning

confidence: 99%

“…Lacour et al [97] used combined IPI and PIV technique to study droplet-vortex interaction mechanisms for a cloud of evaporating droplets injected in to a laminar, axisymmetric and pulsed jet flow. While for both this study and [98] the optical configuration includes two cameras imaging the same scattered light using a beam splitter and the laser is perpendicularly polarized, the scattering angle is 90 degree for the former (Fig.…”

Section: Dilute Spray Measurementsmentioning

confidence: 99%

“…Though, a non-90 degree viewing for ILIDS or IPI leads to the inconvenience of varying degree of focus/defocus across the imaging plane (which, though, is not of concern if Scheimpflug condition is implemented, [40]), the signal to noise ratio of the droplet fringe patterns are higher due to maximum interference between refracted and reflected rays. Lacour et al [97] obtained detailed measurements of dynamics of decane and n-heptane spray (weakly and strongly evaporating droplets, respectively) conditioned by droplet size, which can be used for validation of numerical models.…”

Section: Dilute Spray Measurementsmentioning

confidence: 99%

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Two-Phase Characterization for Turbulent Dispersion of Sprays: A Review of Optical Techniques

Sahu

Manish

Hardalupas

2017

Energy, Environment, and Sustainability

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In liquid fueled combustion the interaction of spray droplets with surrounding turbulent air flow is crucial since it influences the evaporation rate of the fuel droplets and the process of air and fuel vapor mixture preparation. For detail understanding on the droplet-turbulence interaction mechanisms as well as to validate numerical simulations of sprays, simultaneous measurement of both dispersed and carrier phases of the spray is essential. This way the vortical interaction of droplets can be fully characterized such that important issues such as local spray unsteadiness and spatio-temporal inhomogeneity of droplet concentration due to droplet clustering, and group evaporation of droplets can be addressed. This review focuses on the advances in the optical diagnostics (especially the planar techniques) in the last few decades to meet these requirements. Due to broad size and velocity distributions of spray droplets, the application of the two-phase measurement techniques to sprays encounters challenges especially in phase discrimination. Additionally, for sprays, it is not sufficient to simultaneously measure two-phase velocities but the droplet size is also important since the dynamic drag on droplets is according to their size and velocity relative to the surrounding gas flow. The techniques with such capability are explored. The sources of uncertainty, and advantages and limitations of different two-phase measurement approaches are analyzed according to their application to dense and dilute sprays.

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Section: Dilute Spray Measurementsmentioning

confidence: 99%

Section: Dilute Spray Measurementsmentioning

confidence: 99%

Section: Dilute Spray Measurementsmentioning

confidence: 99%

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Two-Phase Characterization for Turbulent Dispersion of Sprays: A Review of Optical Techniques

Sahu

Manish

Hardalupas

2017

Energy, Environment, and Sustainability

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“…The trajectory of drops has been studied in several applications of a subfield of FD called multiphase flow [58,[103][104][105][106], relevant for example to spray painting, inkjet printing, fuel sprays, meteorology, medical sprays, and the fabrication of micro-particles. Typical topics of interests in multiphase flow are the generation and control of desired distributions of drops size and velocities.…”

Section: Fluid Dynamics Descriptionmentioning

confidence: 99%

Fluid dynamics topics in bloodstain pattern analysis: Comparative review and research opportunities

Attinger

Moore

Donaldson

et al. 2013

Forensic Science International

155

139

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This comparative review highlights the relationships between the disciplines of bloodstain pattern analysis (BPA) in forensics and that of fluid dynamics (FD) in the physical sciences. In both the BPA and FD communities, scientists study the motion and phase change of a liquid in contact with air, or with other liquids or solids. Five aspects of BPA related to FD are discussed: the physical forces driving the motion of blood as a fluid; the generation of the drops; their flight in the air; their impact on solid or liquid surfaces; and the production of stains. For each of these topics, the relevant literature from the BPA community and from the FD community is reviewed. Comments are provided on opportunities for joint BPA and FD research, and on the development of novel FD-based tools and methods for BPA. Also, the use of dimensionless numbers is proposed to inform BPA analyses. Keywordsbloodstain pattern analysis, review, dimensionless number, drop generation, trajectory, impact, stain Disciplines Laboratory and Basic Science Research | Other Mechanical EngineeringComments NOTICE: this is the author's version of a work that was accepted for publication in Forensic Science International. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Forensic Science International, [231, 1-3, (2013) Abstract: This comparative review highlights the relationships between the disciplines of bloodstain pattern analysis (BPA) in forensics and that of fluid dynamics (FD) in the physical sciences. In both the BPA and FD communities, scientists study the motion and phase change of a liquid in contact with air, or with other liquids or solids. Five aspects of BPA related to FD are discussed: the physical forces driving the motion of blood as a fluid; the generation of the drops; their flight in the air; their impact on solid or liquid surfaces; and the production of stains. For each of these topics, the relevant literature from the BPA community and from the FD community is reviewed. Comments are provided on opportunities for joint BPA and FD research, and on the development of novel FD-based tools and methods for BPA. Also, the use of dimensionless numbers is proposed to inform BPA analyses.

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“…The PIV data obtained in these areas are likely to present gaps and the results have to be treated very carefully to avoid misinterpretations. The low number of lit pixels in these regions can be explained by the fact that the fuel droplets must spend a relatively long time in the combustion chamber before appearing in the recirculation zones: because the air is preheated at 200°C, the smaller droplets following the air flow are thus likely to be already vaporised while most of the bigger ones are not able to enter these zones due to ballistic effects [23]. When the siren is turned on and operated at its maximum amplitude (CSR 88%), the map of the average number of lit pixels per PIV window is extremely similar to the one shown on Fig.…”

Section: Spatial Distribution Of the Spraymentioning

confidence: 99%

Experimental Study of the Interactions Between Air Flow Rate Modulations and PVC in a Swirl-Stabilised Liquid Fuel Burner

Renaud

Ducruix

Scouflaire

et al. 2015

Volume 4A: Combustion, Fuels and Emissions

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In a swirl-stabilised liquid fuel burner, the fuel spray response to the Precessing Vortex Core (PVC) and air flow rate modulations is analysed in non-reacting conditions. A siren-like device is used to modulate the air flow rate at a frequency corresponding to longitudinal combustion instability oscillations observed during reacting tests. Time-resolved Mie scattering images of the fuel spray are recorded and treated with multiple post-processing methods based on Dynamic Mode Decomposition. The spray velocity fluctuations induced by the PVC and the siren-generated modulations are extracted from noisy datasets and studied. The evolution of the PVC impact on the spray for different levels of flow rate fluctuations is followed and a nonlinear interaction mode is highlighted for several intensities of flow rate modulations. It is shown that increasing the flow rate modulations tend to weaken the PVC impact on the spray, progressively disturbing its structure, starting from the downstream part and progressing upstream. These observations on the fuel spray can be used to understand and interpret data obtained in reacting conditions, for example when competition between PVC and longitudinal combustion instabilities occurs.

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Interaction of a polydisperse spray with vortices

Cited by 24 publications

References 29 publications

Two-Phase Characterization for Turbulent Dispersion of Sprays: A Review of Optical Techniques

Two-Phase Characterization for Turbulent Dispersion of Sprays: A Review of Optical Techniques

Fluid dynamics topics in bloodstain pattern analysis: Comparative review and research opportunities

Experimental Study of the Interactions Between Air Flow Rate Modulations and PVC in a Swirl-Stabilised Liquid Fuel Burner

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