Simultaneous measurement of droplet size and velocity field by an interferometric imaging technique in spray combustion

Fujisawa, Nobuyuki; Hosokawa, Akira; Tomimatsu, Shigeyuki

doi:10.1088/0957-0233/14/8/320

Cited by 20 publications

(11 citation statements)

References 9 publications

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“…The uncertainty in velocity measurement is estimated to 3%. The details of uncertainty analysis can be found in Fujisawa et al (2003). Figure 2 shows schilieren photographs of the flame.…”

Section: Measurement Of Temperature and Velocitymentioning

confidence: 99%

Visualization of dilute hydrogen jet flame in air flow

Chinone

Fujisawa

2004

J Vis

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The structure of hydrogen jet flame diluted by CO2 in air flow is studied by various visualization techniques, such as schlieren, direct photograph, tracer injection and reactive Mie scattering method, which allow understanding of the influence of CO2 on the characteristics of the hydrogen jet flame. The experimental result indicates that the flame structure consists of laminar fuel jet and surrounding reaction zone near the nozzle exit. When the CO2 fraction is increased, the width of the fuel jet grows and the reaction zone is reduced in size. These observations are further confirmed by quantitative measurements of temperature and velocity fields in the flame, which are evaluated by thermocouple and particle image velocimetry (PIV), respectively. These results indicate that the flame temperature is decreased and the flow rate of the fuel jet is increased by the influence of diluents, which are due to the reduced calorific value and larger density of fuel, respectively.

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“…The uncertainty in velocity measurement is estimated to 3%. The details of uncertainty analysis can be found in Fujisawa et al (2003). Figure 2 shows schilieren photographs of the flame.…”

Section: Measurement Of Temperature and Velocitymentioning

confidence: 99%

Visualization of dilute hydrogen jet flame in air flow

Chinone

Fujisawa

2004

J Vis

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“…11 Interferometric Mie Imaging (IMI) is also known as Interferometric Laser Imaging for Droplet Sizing (ILIDS) or Mie Scattering Imaging (MSI). As discussed by Fujisawa,12 this sampling technique utilizes light scattering and interference for a 2D spray characterization. Berg et al 10 also described the shadow imaging of particles which uses high-magnification optics to record the image with pulsed backlight illumination.…”

Section: Introductionmentioning

confidence: 99%

Improving droplet sizing methodology for spray dynamics investigation

Woo

Garaniya

2016

International Journal of Spray and Combustion Dynamics

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Spray modelling is one of the most useful techniques to characterize engine performance, efficiency and emissions. The size of droplets is one of the key variables that govern the efficiency of combustion of the liquid fuel. This study aims to develop an interactive tool using MATLAB codes that identifies the droplets and their sizes from the image taken with the long distance microscope in the spray chamber setup. In this developed method, firstly the background of the image was removed and then image processing techniques, dilation and erosion, were applied to the image file to refine the image files. Subsequently, circle detection method based on the Hough Transform algorithm with the function of imfindcircles was implemented. This function of the program allows the user to identify size droplets from the image files. A statistical study was conducted with the results automated from the MATLAB program using a different set of threshold values of black and white contrast. The results showed an optimal range for the threshold (black and white) values between 40 and 70. This optimal threshold range was established based on consideration of the correct and incorrect identification of the droplets. The results indicated that the program has the ability to identify the droplet providing size and numbers. The MATLAB program was developed using MATLAB compiler and can be used at different workstations.

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“…The IDI method has been applied to characterize fuel sprays and droplets in combustion flames, however, its application in ICP is challenging due to the small size of the droplets and intense background emission from the plasma. [30][31][32][33][34][35][36][37] The IDI method is applicable to any sample introduction device, yet our studies are focused on a demountable direct injection high efficiency nebulizer (d-DIHEN), 38 partly because the aerosol from direct injection devices is coarser than that of conventional nebulizer-spray chamber arrangements, resulting in deterioration of plasma properties and greater levels of matrix effects. 39,40 In situ measurements of aerosol properties can reveal causes of matrix effects and the trends in spatial distribution of analyte signal and plasma properties.…”

Section: Introductionmentioning

confidence: 99%

Interferometric droplet imaging for in situ aerosol characterization in an inductively coupled plasma

Jorabchi

Brennan

Levine

et al. 2006

J. Anal. At. Spectrom.

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Size, velocity and evaporation rate of droplets in an Ar inductively coupled plasma (ICP) are simultaneously measured for the first time using a novel laser based imaging technique. In interferometric droplet imaging (IDI), an interference pattern created by the reflected and refracted rays from a droplet are collected in an out-of-focus image. The droplet diameter is determined by counting the number of fringes in the collected interference pattern. Combination of IDI and particle tracking velocimetry (PTV) provides the capability of monitoring droplet properties during the journey inside ICP. Using a demountable-direct injection high efficiency nebulizer, droplets in the range of 3-30 mm in diameter traveling at 15-70 m s À1 are observed in the analytical zone of the ICP. The upper velocity threshold for surviving droplets is determined by the nebulizer gas flow rate, whereas the lower threshold is mainly influenced by thermal expansion of the plasma gas. Droplet evaporation rates (0.26-0.36 mm 2 s À1 ) are in good agreement with other reports and theoretical simulations for droplets in a 3000 K Ar environment.

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Simultaneous measurement of droplet size and velocity field by an interferometric imaging technique in spray combustion

Cited by 20 publications

References 9 publications

Visualization of dilute hydrogen jet flame in air flow

Visualization of dilute hydrogen jet flame in air flow

Improving droplet sizing methodology for spray dynamics investigation

Interferometric droplet imaging for in situ aerosol characterization in an inductively coupled plasma

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