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- 저자 : ( T. Inamura ) (검색결과 2 건)
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Effect of Liquid Properties on Atomization Characteristics of Liquid Jet across Sheet-Like Air Flow
( T. Yamaguchi ),( T. Okabe ),( M. Shirota ),( T. Inamura ),( M. Daikoku ),( T. Soma ),( Y. Saito ),( Y. Matsushita ),( H. Aoki ),( J. Fukuno ) 한국액체미립화학회 2017 한국액체미립화학회 학술강연회 논문집 Vol.2017 No.-
A rotary bell-cup atomizer is widely used in the automotive spray painting. The characteristics of this painting is known as high quality finish, high coating efficiency and relatively homogeneous droplet production. The atomizer causes the ligament breakup by the shaping air blowing from the rear of the bell cup. The shaping air carries the generated droplets to the target. In the industrial painting, many paints of different physical properties are used. However, few studies have focused on the effects of physical properties of paint on the atomization characteristics such as the spray angle and the droplet trajectory. The objective of this study is to experimentally clarify the effect of the physical properties of paint on the atomization characteristics. In the experiment, liquid jet (assuming the ligament of paint) was broken up by sheet-like air flow. The experimental conditions such as the air velocity, the liquid density, viscosity and surface tension were varied. The droplet diameter and velocity were quantitatively measured by Particle Tracking Velocimetry (PTV) using double-pulsed Nd: YAG laser with a diffuser as a back light. The breakup point of the liquid jet was measured by image processing method. The experimental results showed that the decrease of surface tension and viscosity produces the finer droplets that are easily carried by the air flow, which results in the increases in the spray angle. This is because the decrease of restoring force and viscous damping due to the decrease of surface tension and liquid viscosity, respectively, promotes the deformation of liquid column, and increases the occurrence frequency of a bag-shaped breakup. We also revealed that the liquid viscosity and surface tension affect droplet trajectory and the range of spray angle.
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Lattice modulation and superelasticity in oxygen-added β-Ti alloys
Tahara, M.,Kim, H.Y.,Inamura, T.,Hosoda, H.,Miyazaki, S. Elsevier Science 2011 ACTA MATERIALIA Vol.59 No.16
The microstructure and martensitic transformation behavior of (Ti-23Nb)-1.0O (at.%) alloy have been closely and systematically investigated by transmission electron microscopy (TEM). Diffuse streaks along the <110><SUB>β</SUB><SUP>*</SUP> directions with intensity maxima at ½ positions between basal spots are observed in selected area diffraction patterns obtained from the β phase. The streaks correspond to six variants of {110}<SUB>β</SUB><11@?0><SUB>β</SUB> transverse lattice modulation caused by randomly distributed oxygen atoms and their local strain fields. Nanosized modulated domains (nanodomains) in the β phase are confirmed in dark field micrographs. These nanodomains act as local barriers to martensitic transformation, thereby suppressing long-range martensitic transformation in the (Ti-23Nb)-1.0O alloy. We suggest a new mechanism for superelasticity in oxygen-containing β-Ti-Nb alloys based on the results of in situ X-ray diffraction measurements and in situ TEM observations.
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