Effect of Crankcase Oil on the Particle Size Distribution and Total Number Concentration in a Heavy Duty CNG Engine

2015 ◽  
Author(s):  
Vishnu Vijayakumar ◽  
Bhuvenesh Tyagi ◽  
Reji Mathai ◽  
Shyam Singh ◽  
A K Sehgal
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Number Concentration ◽  
Heavy Duty ◽  
Crankcase Oil ◽  
Cng Engine

Determination of Particle-Size Distribution and Concentration of Cigarette Smoke by a Light-Scattering Method

1977 ◽  
Vol 9 (3) ◽  
Author(s):  
T. Okada ◽  
Y. Ishizu ◽  
K. Matsunuma
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Cigarette Smoke ◽  
Scattered Light ◽  
Geometric Mean ◽  
Number Concentration ◽  
Scattering Method ◽  
Working Standard

AbstractA new method for determining particle-size distribution of cigarette smoke particles was developed by simultaneous measurement of scattered light at three angles for a fixed wavelength. A theoretical chart useful for this purpose, which was made of the relative intensities of scattered light at the angles 45° and 135° to that at the angle 90°, was calculated on the basis of the Mie theory. The number concentration was determined from the Rayleigh ratio using the working standard method. The measurements were rapidly performed, without change of particle size during measuring time, with a device for dilution. The geometric mean diameter, the logarithmic standard deviation and the number concentration of mainstream smoke were found to be about 0.18 um, 0.4 and 3 X 10

scholarly journals Evolution of Aerosol Particles in the Rainfall Process via Method of Moments

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Fangyang Yuan ◽  
Fujun Gan
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Method Of Moments ◽  
Particle Number ◽  
Aerosol Particles ◽  
Geometric Mean ◽  
Number Concentration ◽  
Brownian Diffusion ◽  
Particle Number Concentration

The method of moments is employed to predict the evolution of aerosol particles in the rainfall process. To describe the dynamic properties of particle size distribution, the population balance equation is converted to moment equations by the method of moments and the converted equations are solved numerically. The variations of particle number concentration, geometric mean diameter, and geometric standard deviation are given in the cases that the Brownian diffusion and inertial impaction of particles dominate, respectively. The effects of raindrop size distribution on particle size distribution are analyzed in nine cases. The results show that the particle number concentration decreases as time goes by, and particles dominated by Brownian diffusion are removed more significantly. The particle number concentration decreases much more rapidly when particle geometric mean diameter is smaller, and the particle size distribution tends to be monodisperse. For the same water content, the raindrops with small geometric mean diameters can remove particles with much higher efficiency than those with large geometric mean diameters. Particles in the “Greenfield gap” are relatively difficult to scavenge, and a new method is needed to remove it from the air.

Study of Particle Size Distribution Emitted From a Diesel Engine by Diesel and Biodiesel-Diesel Blends Fuels

2013 ◽  
Author(s):  
Xiaobei Cheng ◽  
Liang Chen ◽  
Fangqin Yan ◽  
Guohua Chen
Keyword(s):  
Particle Size ◽  
Diesel Engine ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Diesel Fuel ◽  
Number Concentration ◽  
High Load ◽  
Injection Timing ◽  
Biodiesel Blends ◽  
Biodiesel Blend

The effect of diesel and biodiesel blends on particle size and number concentration distributions were studied in diesel engine under different operating conditions, including speeds, loads, and injection timing. The results showed that the engine load was more influential on particle size distribution than the engine speed. At the high load, diesel fuels produced mainly accumulation-mode particles, and at medium or lower load, diesel fuel produced more nuclei-mode particles. The injection timing had obviously influence on particle size distribution and number concentration. Advanced injection timing induced higher number concentrations of nuclei-mode particles for the low load and more accumulation mode particles for high load. Compared to the neat diesel fuel, the combustion process was improved when fueled with diesel-biodiesel blends. The oxygen contained in the biodiesel fuel may improve combustion. The number and mass concentration of PM was greatly decreased with the increase in biodiesel blend ratio. Biodiesel blends had an early start of injection, and particle size distributions tended to be ultra-fine particles with the increase in the ratio of biodiesel blend. The average mid-diameter range of particles was significantly affected by the change in fuel injection timing.

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