Investigation of droplet size distribution in two-phase flows using a combined method for recording droplet fluorescence and diffraction scattering of light

2012 ◽  
Vol 48 (3) ◽  
pp. 281-286
Author(s):  
A. G. Golubev ◽  
A. A. Sviridenkov ◽  
V. I. Yagodkin
Keyword(s):  
Size Distribution ◽  
Droplet Size ◽  
Droplet Size Distribution ◽  
Combined Method ◽  
Diffraction Scattering ◽  
Two Phase Flows ◽  
Two Phase ◽  
Scattering Of Light

Study on atomization particle size characteristics of two-phase flow nozzle

2021 ◽  
pp. 1-12
Author(s):  
Haoqi Lilan ◽  
Junbin Qian ◽  
Nan Pan
Keyword(s):  
Particle Size ◽  
Size Distribution ◽  
Droplet Size ◽  
High Speed ◽  
Droplet Size Distribution ◽  
Average Diameter ◽  
Spray Atomization ◽  
Two Phase ◽  
Nozzle Pressure ◽  
Local Observation

Nozzle spray atomization is widely used in industrial and agricultural production processes and is a very complicated physical change. The spray atomization of the nozzle is a process in which the droplets are continuously broken into finer particles under the action of force, in order to study the effect of nozzle atomization, that is, droplet size distribution characteristics. The experimental average mathematical model of droplet size distribution was established by introducing the average diameter of Sutter (SMD). The droplet size distribution in the atomization field of the nozzle is studied by simulation. In the experimental study, the high-speed camera, external mixing air atomizing nozzle platform experimental device and image processing were used, and the atomization field was divided into multiple observation areas. Through the measurement of several local observation areas, the droplet size distribution of the whole atomization field is constructed. It provides a reference for the study of the atomization field of the nozzle and a basis for the intuitive understanding of the droplet size distribution in the atomization field of the nozzle. The effective atomization area of the nozzle atomization was selected to study the influence of the liquid flow rate, the liquid temperature and the nozzle pressure on the atomized particle size distribution of the externally mixed atomizing nozzle. The internal law is obtained, which provides a basis and reference for effectively controlling the atomization effect in the atomization field.

scholarly journals Numerical simulation of high-pressure gas atomization of two-phase flow: Effect of gas pressure on droplet size distribution

2019 ◽  
Vol 30 (11) ◽  
pp. 2726-2732 ◽  
Author(s):  
Kalpana Hanthanan Arachchilage ◽  
Majid Haghshenas ◽  
Sharon Park ◽  
Le Zhou ◽  
Yongho Sohn ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
High Pressure ◽  
Size Distribution ◽  
Droplet Size ◽  
Droplet Size Distribution ◽  
Gas Pressure ◽  
Phase Flow ◽  
Gas Atomization ◽  
Two Phase ◽  
Flow Effect

Numerical Analysis of Heat and Mass Transfer From Horizontal Cylinders in Downward Flow of Air-Water Mist

1990 ◽  
Vol 112 (2) ◽  
pp. 472-478 ◽  
Author(s):  
T. Aihara ◽  
W.-S. Fu ◽  
Y. Suzuki
Keyword(s):  
Mass Transfer ◽  
Numerical Analysis ◽  
Size Distribution ◽  
Heat And Mass Transfer ◽  
Droplet Size ◽  
Droplet Size Distribution ◽  
Water Mist ◽  
Circular Cylinders ◽  
Two Phase ◽  
Downward Flow

A numerical analysis is made of heat and mass transfer from horizontal circular cylinders in a downward flow of air/water mist of polydisperse droplets, taking into account the far-upstream droplet size distribution and the blockage effect of the gas phase flow. The effects of the droplet size distribution, temperatures, and liquid-to-gas mass flow ratio upon the liquid film thickness and wall shear stress, velocity, and temperature of the air-water interface, two-phase Nusselt numbers, etc., are examined.

Thermal-Hydraulics of OC-OTEC Spout Flash Evaporators

1992 ◽  
Vol 114 (3) ◽  
pp. 187-196 ◽  
Author(s):  
S. M. Ghiaasiaan
Keyword(s):  
Size Distribution ◽  
Droplet Size ◽  
Two Phase Flow ◽  
Mechanistic Model ◽  
Droplet Size Distribution ◽  
Momentum Conservation ◽  
Phase Flow ◽  
Two Phase ◽  
Conservation Equations ◽  
Size Groups

A mechanistic model was developed for the thermal-hydraulic processes in the spout flash evaporator of an OC-OTEC plant. Nonequilibrium, two-fluid, conservation equations were solved for the two-phase flow in the spout, accounting for evaporation at the gas-liquid interface, and using a two-phase flow regime map consisting of bubbly, churn-turbulent and dispersed droplet flow patterns. Solution of the two-phase conservation equations provided the flow conditions at the spout exit, which were used in modeling the fluid mechanics and heat transfer in the evaporator, where the liquid was assumed to shatter into a spray with a log-normal size distribution. Droplet size distribution was approximated by using 30 discrete droplet size groups. Droplet momentum conservation equations were numerically solved to obtain the residence time of various droplet size groups in the evaporator. Evaporative cooling of droplets was modeled by solving the 1-D heat conduction equation in spheres, and accounting for droplet internal circulation by an empirical thermal diffusivity multiplier. The model was shown to favorably predict the available single-spout experimental data.

Droplet size distribution after liquid entrainment in horizontal stratified two-phase three-field dispersed flow

2010 ◽  
Vol 65 (4) ◽  
pp. 1407-1414 ◽  
Author(s):  
L.E. Patruno ◽  
J.M. Marchetti ◽  
C.A. Dorao ◽  
H.F. Svendsen ◽  
H.A. Jakobsen
Keyword(s):  
Size Distribution ◽  
Droplet Size ◽  
Droplet Size Distribution ◽  
Two Phase ◽  
Dispersed Flow ◽  
Liquid Entrainment
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