High-speed laser analyzer of microparticle size distribution

1985 ◽  
Vol 24 (7) ◽  
pp. 505-509 ◽  
Author(s):  
V. I. Ovod ◽  
V. Ya. Shlyuko
Keyword(s):  
Size Distribution ◽  
High Speed ◽  
Microparticle Size ◽  
Laser Analyzer

Micro-splashing by drop impacts

2012 ◽  
Vol 706 ◽  
pp. 560-570 ◽  
Author(s):  
S. T. Thoroddsen ◽  
K. Takehara ◽  
T. G. Etoh
Keyword(s):  
Free Surface ◽  
Size Distribution ◽  
Solid Surface ◽  
High Speed ◽  
Solid Substrate ◽  
Liquid Sheet ◽  
Drop Surface ◽  
High Speed Video ◽  
Rain Drops ◽  
Drop Impacts

AbstractWe use ultra-high-speed video imaging to observe directly the earliest onset of prompt splashing when a drop impacts onto a smooth solid surface. We capture the start of the ejecta sheet travelling along the solid substrate and show how it breaks up immediately upon emergence from the underneath the drop. The resulting micro-droplets are much smaller and faster than previously reported and may have gone unobserved owing to their very small size and rapid ejection velocities, which approach 100 m s−1, for typical impact conditions of large rain drops. We propose a phenomenological mechanism which predicts the velocity and size distribution of the resulting microdroplets. We also observe azimuthal undulations which may help promote the earliest breakup of the ejecta. This instability occurs in the cusp in the free surface where the drop surface meets the radially ejected liquid sheet.

Development of the Measurement and Analysis System of Nanoparticles Size Distribution

2010 ◽  
Vol 121-122 ◽  
pp. 168-171 ◽  
Author(s):  
Zhen Mei Li ◽  
Wen Ge Li ◽  
Jin Shen ◽  
Wei Liu
Keyword(s):  
Light Scattering ◽  
Size Distribution ◽  
Virtual Instrument ◽  
High Speed ◽  
Photon Counting ◽  
Peak Position ◽  
Time Data ◽  
The Real ◽  
Measurement And Analysis ◽  
Analysis System

The measurement and analysis system of nanoparticles size distribution was developed by using virtual instrument technology, while the photon counting technology was applied in the system to replace the expensive correlator. High speed photon pulse counter was designed. The real-time data of nanoparticles dynamic light scattering were analyzed in the mixed program of MATLAB and LabVIEW, where the time autocorrelation functions of nanoparticles light scattering signals of monodisperse and polydisperse are reversed by NNLS arithmetic. Experiments results show that the peak position, peak width and symmetry of inverse distribution are very close to the real simulate particles.

Droplet Interaction in the Liquid Injection by Multiple Orifices in the Performance of a Venturi Scrubber

2008 ◽  
Vol 591-593 ◽  
pp. 896-901 ◽  
Author(s):  
Vádila Giovana Guerra ◽  
M.A.F. Daher ◽  
M.V. Rodrigues ◽  
José Antônio Silveira Gonçalves ◽  
José Renato Coury
Keyword(s):  
Size Distribution ◽  
High Speed ◽  
Liquid Flow Rate ◽  
Experimental Tests ◽  
Liquid Jet ◽  
Gas Velocity ◽  
Venturi Scrubber ◽  
Liquid Injection ◽  
Multiple Jets ◽  
Jet Penetration

The Venturi scrubber, equipment frequently used in the removal of particles from gases, is constituted basically by a duct with a convergent section followed by a constriction, or throat, and a divergent section. A liquid, usually injected in the throat, is atomized by the flowing air at high speed. The formed droplets act as collectors of particles from the gas. The size and the size distribution of the droplets inside the equipment are therefore of great importance in the equipment performance. In the present work, the liquid jet penetration is visualized and the study of the droplet formation in a rectangular Venturi is carried out. The liquid injection is made through multiple orifices and the interaction of multiple jets is taken into account. In the experimental tests, the gas velocity in the throat, the liquid flow rate and the number of orifices for liquid injection were varied. A Malvern Spraytec aerosol analyzer was used for measuring of the droplet size and size distribution. The results showed that the liquid jet penetration influences significantly the size of the formed droplet.

In situ characterisation of size distribution and rise velocity of microbubbles by high-speed photography

2020 ◽  
Vol 225 ◽  
pp. 115836 ◽  
Author(s):  
Bert Swart ◽  
Yubin Zhao ◽  
Mohammed Khaku ◽  
Eric Che ◽  
Richard Maltby ◽  
...  
Keyword(s):  
Size Distribution ◽  
High Speed ◽  
High Speed Photography ◽  
Rise Velocity

Influence of Particle Size Distribution on the High-Speed Flow of Gas-Solid Suspensions in a Pipe

1969 ◽  
Vol 184 (3) ◽  
pp. 67-76 ◽  
Author(s):  
F. R. Mobbs ◽  
H. M. Bowers ◽  
D. M. Riches ◽  
B. N. Cole
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Pressure Distribution ◽  
Size Distribution ◽  
High Speed ◽  
High Speed Flow ◽  
Photographic Technique ◽  
Speed Flow ◽  
Predicted Values ◽  
Experimental Values

Experiments on the flow of air-solids mixtures through long straight lengths of brass and nylon pipe, under choking conditions, are described. The powders conveyed are polystyrene, silica, and steel shot. Experimentally determined pressure distribution curves are used to compute the variation of gas and solids, velocities, and temperatures along the pipes, taking into account the size distribution of each powder. The predicted values of gas and solids velocities are compared with experimental values obtained by pitot tube traversing, and a highspeed photographic technique, respectively.

Sign in / Sign up

Export Citation Format

Share Document