Measurement of the liquid phase mass in gas-liquid sprays by X-ray attenuation

Gomi, Hiromi; Hasegawa, K.

doi:10.1016/0301-9322(84)90002-8

Cited by 17 publications

(7 citation statements)

References 4 publications

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“…Now in general the media are optically thin so that the higher orders off, of Eq. (14) are negligible. In that case the measured composite scattering distribution is equal to S , (0) and the inversion of S , has been studied by many authors.…”

Section: The Inverse Problemmentioning

confidence: 95%

Modeling of Multiple Scattering Effects in Fraunhofer Diffraction Particle Size Analysis

Hirleman

1988

Part & Part Syst Charact

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A model for the direct problem of calculating the forward scattering signature of a multiple scattering medium is presented. The new formulation is optimized for integration into schemes for reconstructing the particle size distribution from laser diffraction (forward scattering) signatures obtained from optically thick media. The analysis is valid for media where the particle sizes and interparticle spacings are large (relative to the wavelength and the particle size, respectively) such that Fraunhofer diffraction theory adequately describes the properties of the forward scattered light from individual scattering events. The simulated performance of laser diffraction particle sizing instruments was then studied using predictions of the scattered light signatures which would be measured by laser diffraction instrument under multiple scattering conditions. The results were compared with experimental data and theoretical calculations based on other models.

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Section: The Inverse Problemmentioning

confidence: 95%

Modeling of Multiple Scattering Effects in Fraunhofer Diffraction Particle Size Analysis

Hirleman

1988

Part & Part Syst Charact

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“…Absorption measurements (based on 20,000-25,000 counts) were made for 30-60 parallel paths through the flow and deconvoluted in the same manner as Santoro et al 12 and Ruff et al 1 The narrow absorption path minimized potential errors due to the orientation of liquid elements to less than 5%. 13 Experimental uncertainties were largely due to finite sampling times and background from the small drops dispersed within the pressure vessel. They are estimated (95% confidence) to be less than 30% for a f > 0.01.…”

Section: Gamma-ray Absorption Measurementsmentioning

confidence: 99%

Effects of gas density on the structure of liquid jets in still gases

1992

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A theoretical and experimental study of the near jet-exit region of nonevaporating round liquid jets in still gases is described, emphasizing effects of ambient gas density in the atomization breakup regime where liquid breakup begins right at the jet exit. Mean liquid volume fraction distributions were measured for 9.5-mm-diam water jets in still air at pressures of 1-8 atm. Mixing was strongly affected by the gas/liquid density ratio and the degree of flow development at the jet exit, with the largest gas/liquid density ratio and fully developed turbulent pipe flow yielding the fastest mixing rates. Flow properties were predicted using the locally homogeneous flow approximation, where relative velocities between the phases are assumed to be small in comparison to mean flow velocities. Predictions were in good agreement with measurements, including representation of effects of gas/liquid density ratio and flow development at the jet exit, but only at relatively high mixture fractions. In contrast, separated flow effects caused predictions to overestimate rates of flow development at low mixture fractions.

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“…First studies concerning dense sprays investigation by means of X-ray absorption techniques date back to the 80s. In 1984 Gomi and Hasegawa (1984) estimated the mass distribution of the liquid phase in a water/gaseous nitrogen spray by the X-ray absorption method. Recently, synchrotron radiation source (SRS) absorption-based techniques have been applied to investigate high-dense regions of the fuel sprays providing quantitative measurements of the fuel mass (Im et al 2013;Kastengren et al 2008).…”

Section: Dynamic Computed Tomography (Dynamicct)mentioning

confidence: 99%

X-ray applications and recent advances @ XLab Frascati

Dabagov

Hampai

Guglielmotti

et al. 2020

Rend. Fis. Acc. Lincei

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XLab Frascati is a facility open to external users for different X-ray analyses, ranging from structural studies through X-ray diffraction to elemental mapping by means of µX-ray Fluorescence, colour tomography and X-ray imaging studies. This is possible thanks to our experimental layouts XENA (X-ray Experimental station for Non-destructive Analysis) and RXR (Rainbow X-Ray) along with our facility for the production of polycapillary optics. The know-how on these optics enable us improving the performances of our setups by adopting the best fitting X-ray optics according to the experimental requirements. To make an example, the main advantage of RXR is that the detection system includes two spectrometers working in high (arranged in the polycapillary confocal geometry) and low X-ray energies,, respectively, permitting both the 2D µXRF scan and 3D µXRF elemental mapping (colour tomography) due to the confocal geometry with a 3-axis fine motion system. The article showcases the results obtained in key case studies where we performed: (i) 2D/3D µXRF to analyse chemical composition of tree rings with respect the influence of the environmental context, to study a "fresco" fragment and assess the presence of damages, to make a 3D reconstruction of a screw encapsulated in glue through the its elemental composition as well as (ii) X-ray imaging and (iii) µCT/dynamic CT to characterize LiF detectors, to study the structure of a flower bud and to evaluate the profile distribution of a diesel spray from the nozzle.

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Measurement of the liquid phase mass in gas-liquid sprays by X-ray attenuation

Cited by 17 publications

References 4 publications

Modeling of Multiple Scattering Effects in Fraunhofer Diffraction Particle Size Analysis

Modeling of Multiple Scattering Effects in Fraunhofer Diffraction Particle Size Analysis

Effects of gas density on the structure of liquid jets in still gases

X-ray applications and recent advances @ XLab Frascati

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