A Theoretical and Experimental Study of the Characterization of Bubbles Using Light Scattering Interferometry

1991 ◽  
Vol 113 (3) ◽  
pp. 460-468 ◽  
Author(s):  
A. Bren˜a de la Rosa ◽  
S. V. Sankar ◽  
B. J. Weber ◽  
G. Wang ◽  
W. D. Bachalo
Keyword(s):  
Light Scattering ◽  
Surrounding Medium ◽  
Mie Scattering ◽  
Two Phase ◽  
General Validity ◽  
Doppler Method ◽  
Powerful Research Tool ◽  
Size And Morphology ◽  
Mie Scattering Theory

The present work details the theoretical and experimental research undertaken to determine the size and morphology of bubbles, and their dynamic characteristics such as velocity, number density, and volume flux using light scattering interferometry. The approach is based on the measurement of the phase difference of the interference fringe pattern which is produced when a particle passing through the probe volume defined by the intersection of two laser beams scatters light and interferes in the surrounding medium. Detailed analytical/numerical modeling of the phase Doppler approach using Mie scattering theory and the geometrical optics approximation resulted in optimum light scattering collection angles and calibration curves for bubble diagnostics. Using several techniques to generate a steady stream of monosize bubbles in the range from 6 μ to 1800 μm in diameter, the measurements obtained using the phase Doppler method were compared with direct photography yielding an agreement of better than 95 percent. The morphology of spheroidal bubbles was also investigated by placing the transmitting and receiving optical units at specified locations with respect to the scatterers. It is believed that this theoretical and experimental work has given the phase Doppler method general validity as applied to bubble diagnostics and promises to become a powerful research tool in the study of two phase flows.

scholarly journals Predicted Light Scattering from Particles Observed in Human Age-Related Nuclear Cataracts Using Mie Scattering Theory

2007 ◽  
Vol 48 (1) ◽  
pp. 303 ◽  
Author(s):  
M. Joseph Costello ◽  
So¨nke Johnsen ◽  
Kurt O. Gilliland ◽  
Christopher D. Freel ◽  
W. Craig Fowler
Keyword(s):  
Light Scattering ◽  
Scattering Theory ◽  
Mie Scattering ◽  
Age Related ◽  
Mie Scattering Theory

Theoretical analysis on the development of opaque fibers based on Mie scattering

2012 ◽  
Vol 83 (4) ◽  
pp. 355-362 ◽  
Author(s):  
Ni Wang ◽  
Wenyan Pan ◽  
Meiwu Shi ◽  
Jianyong Yu
Keyword(s):  
Refractive Index ◽  
Light Scattering ◽  
Extinction Coefficient ◽  
Incident Light ◽  
Mie Scattering ◽  
Spherical Particles ◽  
Diameter Distribution ◽  
Matlab Program ◽  
Mie Scattering Theory ◽  
First Time

Mie scattering theory has been widely used to solve the problem of light scattering by single spherical particles in many fields. In this article, it was applied for the development of opaque fiber for the first time. Firstly, the spheroid particles were simplified as equivalent spherical particles. Then, the extinction coefficient was calculated using the Matlab program and the influences of the size parameter, refractive index and the wavelength of the incident light on the extinction coefficient were discussed in detail. Finally, the results indicated that the extinction coefficient depended greatly on the dimension and the refractive index of the particles, and also the wavelength of the incident light. For the development of the opaque fiber, it would be better to choose particles that had the higher refractive index and a certain diameter distribution to achieve the most effective light scattering.

Study on Properties of Light Scattering Based on Mie Scattering Theory for Suspended Particles in Water

2015 ◽  
Vol 52 (1) ◽  
pp. 013001
Author(s):  
Vo Quang Sang Vo Quang Sang ◽  
冯鹏 Feng Peng ◽  
汤斌 Tang Bin ◽  
赵敬晓 Zhao Jingxiao ◽  
蒋上海 Jiang Shanghai ◽  
...  
Keyword(s):  
Light Scattering ◽  
Scattering Theory ◽  
Suspended Particles ◽  
Mie Scattering ◽  
Mie Scattering Theory

scholarly journals Fluorescence Spectroscopy for Studying Evaporating Droplets Using the Dye Eosin-Y

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 5985
Author(s):  
Matthias Koegl ◽  
Christoph Weiß ◽  
Lars Zigan
Keyword(s):  
Mie Scattering ◽  
Droplet Evaporation ◽  
Experimental Investigations ◽  
Fluorescence Signal ◽  
Eosin Y ◽  
Droplet Deformation ◽  
Two Phase ◽  
Lif Spectroscopy ◽  
Single Droplets

Laser-induced fluorescence (LIF) spectroscopy using dyes is frequently applied for characterization of liquids and two-phase flows. The technique is utilized e.g., for mixing studies, thermometry, or droplet sizing. One major application of the LIF technique combined with Mie-scattering is the planar measurement of droplet sizes in spray systems. However, its uncertainty is determined, among others, by varying dye concentration and temperature changes occurring during mixing and droplet evaporation. Systematic experimental investigations are necessary to determine the influence of dye enrichment effects on the LIF-signal of single droplets. For these investigations, the fluorescence dye Eosin-Y is dissolved in water and ethanol, which are typical solvents and working fluids in bio-medical applications and power engineering. A photo-physical characterization of the mixtures under various conditions was conducted using a spectrometric LIF setup and a micro cell. For ethanol, a small temperature dependency of the Eosin-Y LIF signal is observed up to 373 K. Photo-dissociation of Eosin-Y is negligible for solution in ethanol while it is distinct in water. The LIF signals of the single droplets are studied with an acoustic levitator. Effects of droplet evaporation, droplet deformation and varying dye concentration on the LIF-signal are studied. The single droplet measurements revealed a complex change of the fluorescence signal with reduced droplet size. This is due to droplet deformations leading to variations in the internal illumination field as well as dye enrichment during evaporation.

scholarly journals Optical diagnostics of a single evaporating droplet using fast parallel computing on graphics processing units

2016 ◽  
Vol 24 (3) ◽  
Author(s):  
D. Jakubczyk ◽  
S. Migacz ◽  
G. Derkachov ◽  
M. Woźniak ◽  
J. Archer ◽  
...  
Keyword(s):  
Graphics Processing Units ◽  
Mie Scattering ◽  
Lookup Table ◽  
Computing Technology ◽  
Improve Performance ◽  
Scattering Problems ◽  
C Language ◽  
Graphics Processing ◽  
Mie Scattering Theory

AbstractWe report on the first application of the graphics processing units (GPUs) accelerated computing technology to improve performance of numerical methods used for the optical characterization of evaporating microdroplets. Single microdroplets of various liquids with different volatility and molecular weight (glycerine, glycols, water, etc.), as well as mixtures of liquids and diverse suspensions evaporate inside the electrodynamic trap under the chosen temperature and composition of atmosphere. The series of scattering patterns recorded from the evaporating microdroplets are processed by fitting complete Mie theory predictions with gradientless lookup table method. We showed that computations on GPUs can be effectively applied to inverse scattering problems. In particular, our technique accelerated calculations of the Mie scattering theory on a single-core processor in a Matlab environment over 800 times and almost 100 times comparing to the corresponding code in C language. Additionally, we overcame problems of the time-consuming data post-processing when some of the parameters (particularly the refractive index) of an investigated liquid are uncertain. Our program allows us to track the parameters characterizing the evaporating droplet nearly simultaneously with the progress of evaporation.

Characterization of flow regimes in two phase flow using wavelet analysis

2018 ◽  
Author(s):  
Munzarin Morshed ◽  
Syed Imtiaz ◽  
Mohammad Aziz Rahman
Keyword(s):  
Wavelet Analysis ◽  
Two Phase Flow ◽  
Flow Regimes ◽  
Phase Flow ◽  
Two Phase
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