Influence of Some Geometrical Parameters on the Characteristics of Prefilming Twin-Fluid Atomization

Yao, Jiafeng; Furusawa, Shinji; Kawahara, Akimaro; Sadatomi, Michio

doi:10.1139/tcsme-2014-0028

Cited by 4 publications

(12 citation statements)

References 29 publications

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“…Three atomizers of L, M and S in our twin-fluid type were tested in order to study the size effects [7]. The pipe and the orifice diameters of S type were 7 and 4.58 mm respectively as listed in Table 1, and the outlet length was 20.5 mm, and the fiber porous pipe was 25 μm in porosity and 1.5 mm in thickness.…”

Section: Test Atomizersmentioning

confidence: 99%

“…The M type and the L type were twice and three times larger than the S type besides the porosity and the thickness of the porous pipe. Of these, the S type showed the best performance, i.e., the highest in the spray rate to the pneumatic power required [7].…”

Section: Test Atomizersmentioning

confidence: 99%

“…Fig. 3 shows the test apparatus for the twin-fluid type atomizer [4][5][6][7]. Air was supplied with a compressor after controlling the air volume flow rate, Q G .…”

Section: Test Atomizersmentioning

confidence: 99%

“…1 which is the twin-fluid type but has a merit because water is automatically sucked through a porous pipe by a negative pressure arisen downstream from the orifice in the mixer. Thus, the mixer can be operated with a lower electric power than the usual twin-fluid type, i.e., operable with a solar power [3][4][5][6][7][8]. The mixer is also usable as a micro bubble generator [9,10] when water is supplied and air is sucked.…”

mentioning

confidence: 99%

“…In our previous studies, a mathematical model to predict its hydraulic performance was proposed and validated [4], and better geometrical parameters were experimentally clarified [5][6][7][8], i.e., the diameter ratio of the orifice to the mixer pipe, the ratio of the outlet length from the porous pipe to the mixer pipe diameter, the geometry of the orifice, the whole size, and the CO 2 adsorption performance by the mists.…”

mentioning

confidence: 99%

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Air Purification Using Mists Generated by an Efficient Multi-fluid Mixer

Sadatomi¹,

Kawahara²,

Kawasaki³

2016

JEPE

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Sadatomi and Kawahara developed a special twin-fluid atomizer called a multi-fluid mixer, which can spray mists by supplying air alone because water is automatically sucked by a vacuum pressure arisen inside the mixer. In the present paper, firstly, some applications of the mists sprayed by the atomizer are described. Secondly, the performance of the twin-fluid atomizer with best performance was compared with those of the commercial twin-fluid MMA100 type together with the single-fluid swirl type. In the CO 2 adsorption tests, mists were sprayed five minutes by the respective types in turn in a test room, and time variations of CO 2 concentration in air after the introduction of CO 2 in the room were measured at the bottom of the room to compare the CO 2 adsorption rates by the mists for the respective cases. In addition, diameters of droplets for the respective types were measured with a microscope. As a result, superiority of our twin-fluid atomizer was confirmed, because 40% droplets were 20 to 40 μm in diameter, and the CO 2 adsorption rate by the mists with our twin-fluid atomizer was 25% higher than that with the commercial ones.

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Section: Test Atomizersmentioning

confidence: 99%

Section: Test Atomizersmentioning

confidence: 99%

“…Fig. 3 shows the test apparatus for the twin-fluid type atomizer [4][5][6][7]. Air was supplied with a compressor after controlling the air volume flow rate, Q G .…”

Section: Test Atomizersmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Air Purification Using Mists Generated by an Efficient Multi-fluid Mixer

Sadatomi¹,

Kawahara²,

Kawasaki³

2016

JEPE

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Gas–liquid twin-fluid atomization from non-circular orifices

Liu,

Wu,

Zhang

et al. 2024

Physics of Fluids

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Passive control of twin-fluid atomization can be achieved by changing the orifice shape of the injector. In this study, the characteristics of twin-fluid atomization in the outside-in-liquid injector with circular, square, and rectangular orifices at various aspect ratios were investigated experimentally and computationally. The morphology of the spray was captured by shadowgraph, the diameter and velocity of the droplets were measured by the phase Doppler particle analyzer, and numerical simulations were performed for the central gaseous core. Comparing the sprays with square and circular orifices, droplets from the non-circular orifice are generally smaller with less disparities in droplet sizes due to the more intensive turbulent disturbances and corner effect. Furthermore, the non-circular orifice also results in better spatial distribution of the spray. The droplet diameters of the spray with a square orifice do not satisfy the log-normal distribution near the orifice along the centerline of the spray, which may be attributed to the different entrainment of spray droplets by the central gas flow for the sprays with circular and non-circular orifices. The twin-fluid sprays produced by the rectangular orifice also exhibit the same axial switching effect as in the high-pressure gaseous jet flow, in which the spray diffusion in the minor axis is more extensive than that in the major axis. Moreover, the droplets' Sauter mean diameter produced by the rectangular orifice is more sensitive to the size in the minor axis of the orifice and decreases as the aspect ratio of the orifice increases given the same cross-sectional area.

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Comparison of mist generators between twin fluid water suction type and single fluid swirl type

Kawahara¹,

Tanaka²,

Sadatomi³

2015

Third International Conference on Advances in Mechanical, Aeronautical and Production Techniques - MAPT 2015

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Sadatomi and Kawahara invented a multi-fluids mixer which is categorized as a twin-fluid type but have a merit of water suction type. The mixer is usable to generate microbubbles, etc. besides mists, fine droplets. In the mists generation, pressurized air alone is supplied because water can be sucked automatically by a negative pressure arisen downstream from the orifice in the mixer. The objective of the present study is to compare the performance between the above twin-fluid type atomizer and a common single-fluid swirl type atomizer studied in the present experiments. The comparison results showed that the twin-fluid type was superior to the singe-swirl type in the performance of CO 2 adsorption by the mists.The CO 2 adsorption rate by the twin-fluid type was about twice. Such results on the experiments and the comparisons are described in this paper.

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Influence of Some Geometrical Parameters on the Characteristics of Prefilming Twin-Fluid Atomization

Cited by 4 publications

References 29 publications

Air Purification Using Mists Generated by an Efficient Multi-fluid Mixer

Air Purification Using Mists Generated by an Efficient Multi-fluid Mixer

Gas–liquid twin-fluid atomization from non-circular orifices

Comparison of mist generators between twin fluid water suction type and single fluid swirl type

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