INFLUENCE OF SOME GEOMETRICAL PARAMETERS ON THE CHARACTERISTICS OF PREFILMING TWIN-FLUID ATOMIZATION

2014 ◽  
Vol 38 (3) ◽  
pp. 391-404
Author(s):  
Jiafeng Yao ◽  
Shinji Furusawa ◽  
Akimaro Kawahara ◽  
Michio Sadatomi
Keyword(s):  
Great Influence ◽  
Geometrical Parameters ◽  
Porous Fiber ◽  
Spray Characteristics ◽  
Fiber Ring ◽  
Practical Applications ◽  
Internal Mixing ◽  
Mixing Chamber ◽  
Liquid Atomization ◽  
Different Shapes

Geometries are considered to have a great influence on the spray characteristics of atomizers. In the present study, we studied a prefilming twin-fluid atomizer patented by Sadatomi and Kawahara (2012), in which liquid atomization is implemented by supplying compressed air alone into an internal mixing chamber, and water is automatically sucked by the negative pressure induced by an orifice. In the experiments, we studied spray characteristics influenced by the geometrical parameters, such as orifices in different opening area ratios and different shapes, porous rings with different porous diameters, and different atomizer sizes. Higher spray performance can be obtained by a small sized atomizer with a circular orifice in opening area ratio of 0.429 and a porous fiber ring with porosity of 25 μm. The present results provide a significant guidance for practical applications with different requirements of spray characteristics.

1310 Influence of the Thickness of a Mixing Chamber on Spray Characteristics of Internal Mixing Twin-fluid Atomizer

2005 ◽  
Vol 2005.42 (0) ◽  
pp. 435-436
Author(s):  
Yoshimitsu JOGAN ◽  
Yuichi FUNAWATASHI ◽  
Yoshitaka SAKAMURA ◽  
Tateyuki SUZUKI
Keyword(s):  
Spray Characteristics ◽  
Internal Mixing ◽  
Mixing Chamber

scholarly journals Experimental studies into the effect of air pressure on the atomization characteristics of coal-water slurries

2021 ◽  
Vol 25 (5) ◽  
pp. 586-600
Author(s):  
D. V. Gvozdyakov ◽  
A. V. Zenkov ◽  
V. E. Gubin ◽  
A. Zh. Kaltaev ◽  
Ya. V. Marysheva
Keyword(s):  
Liquid Waste ◽  
Engine Oil ◽  
Spray Angle ◽  
Spray Characteristics ◽  
Used Engine Oil ◽  
Water Slurry ◽  
Internal Mixing ◽  
Mixing Chamber ◽  
Coal Water Slurry ◽  
Industrial Rubber

The paper studies the effect of atomizing agent pressure on the spray characteristics after spraying coal-water slurry that contains small additives of liquid waste from the pyrolysis of industrial rubber goods and used engine oil. The conducted experiments used automobile tires as the indicated rubber products; spraying was carried out employing an internal mixing pneumatic atomizer. Following the atomization of considered fuels, droplet size changes were studied using the interferometric particle imaging (IPI) technique. The spray angle was determined by means of a Photron high-speed camera. In addition, coal-water slurry containing liquid waste from the pyrolysis of industrial rubber goods and used engine oil (3–12 wt%) was sprayed to study the effect of atomizing agent pressure on the spray characteristics. A decrease in air pressure was found to reduce the spray angle by less than 6%, which resulted in the formation of rather large droplets exceeding 600 µm in size. It is experimentally confirmed that more fine droplets are formed at similar fuel and air pressures when using a spraying device equipped with an internal mixing chamber for slurry and air. The number of droplets, in this case, is 2–9% higher as compared to a typical two-component coal-water slurry fuel, with the spray angle of the sprayed coal slurry having the greatest value. When using an atomizer having an internal mixing chamber for slurry and an atomizing agent, fuel droplet breakup occurs due to the aerodynamic drag forces of the environment. Thus, the use of such atomizers reduces the number of possible breakup mechanisms for sprayed fuel droplets.

scholarly journals Characteristics of Liquid Atomization by the Internal Mixing Twin-Fluid Atomizer(I). Effect of Geometry of Mixing Chamber.

1997 ◽  
Vol 76 (3) ◽  
pp. 220-228
Author(s):  
Sangjin KIM ◽  
Keiya NISHIDA ◽  
Hiroyuki HIROYASU ◽  
Sinya KONDO
Keyword(s):  
Internal Mixing ◽  
Mixing Chamber ◽  
Liquid Atomization

scholarly journals Characteristics of Liquid Atomization by the Internal Mixing Twin-Fluid Atomizer(II). Effect of Outlet Hole.

1997 ◽  
Vol 76 (4) ◽  
pp. 305-312
Author(s):  
Sangjin KIM ◽  
Keiya NISHIDA ◽  
Hiroyuki HIROYASU ◽  
Sinya KONDO
Keyword(s):  
Internal Mixing ◽  
Liquid Atomization ◽  
Outlet Hole

scholarly journals Stress Concentration Studies in Flat Plates with Rectangular Cut-Outs Using Finite Element Method

2019 ◽  
Vol 4 (1) ◽  
pp. 66-76 ◽  
Author(s):  
Dheeraj Gunwant
Keyword(s):  
Infinite Plate ◽  
Geometrical Parameters ◽  
Light Weight ◽  
Flat Plates ◽  
Uniaxial Load ◽  
Desirable Feature ◽  
Different Shapes ◽  
Stress States ◽  
Analytical Relations ◽  
Good Agreement

Presence of cut-outs of different shapes is inevitable and is many times considered to be a desirable feature for the design of light-weight components. However, the presence of such cut-outs induces highly localized stresses in their vicinity which cannot be resolved using analytical relations and elementary equations of the strength of materials. In the recent years, FEM has evolved as a crucial tool for handling such problems with reduced degree of complexity. The present investigation is aimed at studying the effect of various geometrical parameters and loading scenarios on the SCF induced in an infinite plate in presence of rectangular cut-out with filleted corners. In the first step, the model was subjected to uniaxial load and the obtained values of SCF exhibited good agreement with analytical values. The model was further subjected to systematically varied stress states and geometrical parameters in order to study their effect on the SCF.

Investigation of Amorphous/Crystalline State in Cu-Hf-Al Alloys

2010 ◽  
Vol 649 ◽  
pp. 87-92
Author(s):  
E. Nagy ◽  
Viktória Rontó ◽  
Jenő Sólyom ◽  
András Roósz
Keyword(s):  
Amorphous Alloys ◽  
Great Influence ◽  
Amorphous State ◽  
High Strength ◽  
Al Alloys ◽  
X Ray Diffraction ◽  
X Ray ◽  
Wide Range ◽  
Different Shapes ◽  
Important Purpose

Cu-Hf-Al alloys are considered to be relatively new ones among Cu-based bulk amorphous alloys. Cu-Hf-Al alloys have high strength in amorphous state and this property makes many applications feasible for the industry. During the production of amorphous alloys the most important purpose is to produce them in the biggest diameter to make them suitable for a wide range of applications. The circumstances of the production process have a great influence on the developing structure. In the present work solidification of Cu-Hf-Al alloys were investigated. The alloys were cast into different shapes with different Al contents with special regard to the appearance of the amorphous/crystalline structure. The appearance and the structure of crystalline phases were determined by X-ray diffraction and X-ray, DSC and metallographic measurements were used to investigate the developing structure.

scholarly journals Spraying of Viscous Liquids: Influence of Fluid-Mixing Mechanism on the Performance of Internal-Mixing Twin-Fluid Atomizers

2020 ◽  
Vol 10 (15) ◽  
pp. 5249
Author(s):  
Marek Mlkvik ◽  
Jan Jedelsky ◽  
Heike P. Karbstein ◽  
Volker Gaukel
Keyword(s):  
Optical Diffraction ◽  
Liquid Fuels ◽  
Liquid Viscosity ◽  
Two Phase ◽  
Internal Mixing ◽  
Mixing Chamber ◽  
Wide Range ◽  
Effervescent Atomizer ◽  
The Common ◽  
Jet Nozzle

The thermal usage of liquid fuels implies their combustion, which is a process strongly influenced by the performance of the atomizer, which disrupts the fuel into drops of the required sizes. The spray quality of the twin-fluid atomizers with internal mixing (IM-TFA) is primarily influenced by the two-phase flow pattern inside the mixing chamber. We studied the performance of the four types of the IM-TFA nozzles by the optical diffraction system (Malvern Spraytec) to answer the question of how the mixing chamber design influences the spray quality at low atomizing gas consumption. We tested the effervescent atomizer in outside-in-liquid (OIL) and outside-in-gas (OIG) configurations, the Y-jet nozzle and new nozzle design, and the CFT atomizer when spraying model liquids with the viscosities comparable to the common fuels (μ=60and143 mPa· s). We found that the effervescent atomizer performance was strongly influenced by the configuration of the inlet ports. Although the OIL configuration provided the best spray quality (D32 = 72 μm), with the highest efficiency (0.16%), the OIG nozzle was characterized by unstable work and poor spray quality. Both the devices were sensitive to liquid viscosity. The Y-jet nozzle provided a stable performance over the liquid viscosity spectrum, but the spray quality and efficiency were lower than for the OIL nozzle. Our findings can be used to improve the performance of the common IM-TFA types or to design new atomizers. The results also provide an overview of the tested atomizers’ performances over the wide range of working conditions and, thus, help to define the application potential of the tested nozzle designs.

Influence of Flow Patterns on Spray Characteristics of Internal Mixing Twin Fluid Atomizers.

2004 ◽  
Vol 2004.41 (0) ◽  
pp. 43-44
Author(s):  
Shinichi KAWASHIMA ◽  
Yuichi FUNAWATASHI ◽  
Yoshitaka SAKAMURA ◽  
Tateyuki SUZUKI
Keyword(s):  
Flow Patterns ◽  
Spray Characteristics ◽  
Internal Mixing

scholarly journals AC Loss Measurements of a Trapezoidal Shaped HTS Coil Using an Electrical Method

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
G. Messina ◽  
L. Morici ◽  
U. Besi Vetrella ◽  
G. Celentano ◽  
M. Marchetti ◽  
...  
Keyword(s):  
Electrical Power ◽  
Ac Loss ◽  
Electrical Method ◽  
Air Gaps ◽  
Practical Applications ◽  
Voltage Curve ◽  
Current Voltage ◽  
Current Voltage Curve ◽  
Different Shapes ◽  
Good Agreement

High temperature superconducting (HTS) coils of different shapes (typically circular or trapezoidal) wound on iron or ironless core are fundamental components of many superconducting electrical power devices. A 150-turn (75 turns/pancake) trapezoidal coil in double pancake configuration has been designed and realized in our laboratory of ENEA Frascati. Various epoxy resins and YBCO tapes have been tested in the temperature range room to liquid nitrogen, leading us to the choice of AmSC (American Superconductor) tape for the winding and araldite resin for the impregnation process. The trapezoidal shape has been chosen because of its suitable geometry for practical applications, the results being complementary to what was previously achieved on round shaped HTS coils. The AC transport current losses have been measured using a compensated electrical method and expressed in terms of a linearly frequency dependent resistance. A linear dependence of the losses resistance from frequency was expected and found in agreement with previous results. The current-voltage curve has been measured in zero externally applied field condition, the results being in good agreement with a numerical simulation. The magnetic field distributions, at different air gaps from coil top and zero externally applied filed condition, have been simulated and reported as well.

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