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

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.

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 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.

scholarly journals Unsteady Behaviour of the Effervescent Atomizer

2020 ◽  
Vol 328 ◽  
pp. 01008
Author(s):  
Marek Mlkvik
Keyword(s):  
Plug Flow ◽  
Liquid Fuels ◽  
Viscous Liquids ◽  
Internal Mixing ◽  
Viscosity Increase ◽  
Mixing Chamber ◽  
Effervescent Atomizer ◽  
Fine Spray ◽  
Gas Consumption ◽  
Working Parameters

The effervescent atomizer is a well-established type of the twin-fluid nozzle with internal mixing of fluids. It is popular for the ability to process highly viscous liquids, such as liquid fuels, into a fine spray with low gas consumption. This study aims to investigate the performance of the effervescent nozzle when spraying the liquids with a viscosity up to 308 mPa·s. The working parameters of the nozzle were defined by the mass flows ratio of the gas to the liquid (GLR =2.5 to 20 %) and the gas pressure at the nozzle inlet (Δp = 0.14 MPa). The spray quality was investigated by the laser diffraction system, measuring the spray drop sizes. The investigated nozzle was able to atomize all of the model liquids. However, the liquid viscosity increase led to the need to operate the nozzle with the larger gas consumption. The minimum GLR for the spraying of the liquid with the viscosity 308 mPa·s was 10 %, while the less viscous liquid (60 mPa·s) was processed with the GLR = 2.5 %. It was observed that the spray quality was, at the low GLRs, lowered by unstable nozzle work, caused by the presence of the plug flow in the mixing chamber of the atomizer.

scholarly journals Experimental Study on Internal Mixing Sonic Flow Air Assist Atomizer for Heavy Oils

1990 ◽  
Author(s):  
Ju Shan Chin ◽  
Li Xing Wang
Keyword(s):  
Experimental Study ◽  
Flame Length ◽  
Chamber Pressure ◽  
Heavy Oils ◽  
Air Supply ◽  
Air Stream ◽  
Internal Mixing ◽  
Mixing Chamber ◽  
Fine Spray ◽  
Sonic Flow

Based on the experiences previously obtained from the experimental study of plain jet atomization under cross flowing air stream and under supersonic air flow, the authors designed and studied a serious of internal mixing sonic flow air assist atomizers for heavy oil application. The contradiction between the requirements for fine spray (for high combustion completeness) and for long flame (for flame rigidity) often existing in industrial furnace has been solved. Good data were obtained which can be used for the design of such kind atomizers. By properly choosing the configuration and geometrical dimensions of the atomizer, also by choosing suitable values for mixing chamber pressure, air–liquid ratio, it is possible to have very fine spray and desirable flame length. The results showed that the ratio of mixing chamber pressure to air supply pressure should be in the range of 0.6 to 0.7. For atmospheric pressure combustion furnace, such air assist atomizer needs 0.4 MPa compressed air to have sonic flow at nozzle exit. This type of air assist atomizer has already been put into industrial operation.

EFFECT OF THE INNER TWO-PHASE FLOW ON THE PERFORMANCE OF AN INDUSTRIAL TWIN-FLUID NOZZLE WITH AN INTERNAL MIXING CHAMBER

2009 ◽  
Vol 19 (9) ◽  
pp. 873-884 ◽  
Author(s):  
German Ferreira ◽  
Felix Barreras ◽  
Antonio Lozano ◽  
Juan Antonio Garcia ◽  
Eduardo Lincheta
Keyword(s):  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Internal Mixing ◽  
Mixing Chamber

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

Analysis and prediction of the spray produced by an internal mixing chamber twin-fluid nozzle

2014 ◽  
Vol 128 ◽  
pp. 1-9 ◽  
Author(s):  
Jorge Barroso ◽  
Antonio Lozano ◽  
Félix Barreras ◽  
Eduardo Lincheta
Keyword(s):  
Internal Mixing ◽  
Mixing Chamber
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