Planar Sauter Mean Diameter measurements in liquid centered swirl coaxial injector using Laser Induced Fluorescence, Mie scattering and laser diffraction techniques

Kannaiyan, Kamalakannan; Banda, Manoj Venkata Krishna; Vaidyanathan, Aravind

doi:10.1016/j.actaastro.2016.03.011

Cited by 17 publications

(4 citation statements)

References 30 publications

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“…Since then, the method has been reported in the literature with different names, such as "Laser Sheet Dropsizing" (LSD) [13,14], "Planar Droplet Sizing" (PDS) [15][16][17] or more generally the "LIF/Mie droplet sizing". In this technique, the LIF and Mie optical signals are respectively assumed to be cubic and square dependent to the droplet diameter d [13][14][15][16][17] in the case of spherical micrometric drops. The ratio of LIF/Mie yields a quantity related to d32, popularly known as the Sauter Mean Diameter (SMD).…”

Section: Introductionmentioning

confidence: 99%

3D mapping of droplet Sauter mean diameter in sprays

et al. 2019

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In this study, we report on the 3D (three-dimensional) characterization of a spray in terms of its droplet SMD (Sauter Mean Diameter) using the LIF (Laser-Induced Fluorescence)/Mie ratio technique. The spray structure is analyzed for a multi-hole DISI (Direct-Injection Spark Ignition) injector. A calibration curve to convert LIF/Mie ratio to droplet diameter is deduced using LIF/Mie imaging and analysis of single droplets generated by a droplet generator. The DISI spray investigated here is optically sectioned by means of two-phase SLIPI (Structured Laser Illumination Planar Imaging) to suppress the intensity of multiple light scattering from LIF and Mie images prior to their ratio. A series of calibrated LIF/Mie ratio images of spray is then recorded at several depths along the Z-direction following the light sheet scanning of the spray. The droplet SMD is ranging from less than 5 µm up to a maximum of 50 µm in single-shot images. The averaged SMD results (1-30 µm) obtained by using the calibration curve from the droplet generator are compared with measurement results from Phase-Doppler Anemometry (PDA). Finally, a 3D map is reconstructed from the successive 2D layers generated from spray scanning. The resulting 3D representation of the droplet SMD shows a non-symmetric spray structure produced by the studied multi-hole injector, which cannot be resolved by analyzing only one central plane.

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Section: Introductionmentioning

confidence: 99%

3D mapping of droplet Sauter mean diameter in sprays

et al. 2019

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“…Commonly used mean diameters are Sauter mean diameter (SMD) and mass median diameter. SMD distribution is measured by simultaneous measurements of Mie scattering, planar laser-induced fluorescence and laser diffraction technique [132]. The three-dimensional characterisation of a spray in terms of its droplet SMD using the laser-induced fluorescence / Mie ratio technique [133].…”

Section: Hydrodynamic Parametersmentioning

confidence: 99%

A Review of Parameters and Mechanisms in Spray Cooling

Thakur,

Kadapure,

Hegde

et al. 2023

Metall Mater Eng

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Miniaturisation in avionics, electronics, and medical appliances has led to demands for rapid heat dissipation techniques. The spray cooling technique has gained importance recently due to its advantage over other cooling methods. Parameters affecting heat transfer mechanisms during spray cooling are contemplated. This review presents different heat transfer parameters and their effect on spray cooling by analysis from past studies. Heat transfer surface modifications and different coolant variations to enhance heat transfer effectiveness are also reviewed. Apart from high heat flux having more applications, low heat flux studies have also grabbed the researchers to find solutions with a temperature range lower than 250˚C. Therefore, the upcoming spray cooling technology will have broad applications that will contribute to the maximum efficiency of the heat removal rate.

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“…However, for sprays Deskmukh and Ravikrishna [10] and Desentes et.al [11] have presented methods to account for attenuation effects due to absorption, non-homogenization, and Mie scattering of the laser sheet for volume fraction measurement. Kannaiyan et.al [12], Koegl et.al [13] and Zimmer et.al [14] have demonstrated accurate measurement of the Sauter mean diameter (SMD) by separating detection of LIF and Mie scattering signals with optical filters. Kristensson et.…”

Section: Experimental Analysis Of Lagrangian Paths Of Drops Generated...mentioning

confidence: 99%

Experimental analysis of Lagrangian paths of drops generated by liquid/liquid sprays

Kewalramani

Dossmann

et al. 2022

Exp Fluids

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In the present study, Lagrangian measurements of drop motion of a two-phase spray are analyzed to estimate the collision, fragmentation, size, and velocity field of the drops. An experimental setup is designed to record fluorescence images of drops, illuminated by a planar laser sheet. The recorded images are then processed with a commercially available Lagrangian tracking software, Track. The methodology for particle identification, tracking, and size approximation in Track in the near interface region of spray is stated. With the stated methodology, the information about size, velocity, fragmentation, collision, and change in the shape of the drops are obtained. The effectiveness of the developed methodology is tested against synthetically produced images and is then applied to a liquid/liquid jet. Similar behaviors for dispersed phase fragmentation-collision and mass fragmented along axial location normalized by breakup length of the jet are reported.

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Planar Sauter Mean Diameter measurements in liquid centered swirl coaxial injector using Laser Induced Fluorescence, Mie scattering and laser diffraction techniques

Cited by 17 publications

References 30 publications

3D mapping of droplet Sauter mean diameter in sprays

3D mapping of droplet Sauter mean diameter in sprays

A Review of Parameters and Mechanisms in Spray Cooling

Experimental analysis of Lagrangian paths of drops generated by liquid/liquid sprays

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