• 제목/요약/키워드: atomization

검색결과 1,376건 처리시간 0.026초

초음파에 의한 액체 미립화 특성에 관한 연구 (A study on Characteristics of the Liquid Atomization by Ultrasonic)

  • 주은선;나우정;최우창
    • 한국자동차공학회논문집
    • /
    • 제7권5호
    • /
    • pp.31-39
    • /
    • 1999
  • A good atomization in uniform size brings the elevation of thermal efficiency in spray combustion, the beautiful painting on surfaces, and the economical sprinkling of chemicals. Ultrasonic atomization has been expected as a good uniform atomization mechanism due to its uniform size distribution. Influx, load, and physical properties of liquids are the effecting factors to atomize liquids. In this study, distilled water and city water are selected as reference liquids and gasoline, kerosene, and petroleum as fuel liquids. Characteristics and affinity to get the maximum effect for the ultrasonic atomization are observed by using the two ultrasonic transducers with 28kHz and 2MHz. Results show that the size distributions of liquid spray dorplet by the direct vibration method prevail over those by the aerosol method in uniform droplet size and as a whole, sizes of spray liquid droplets are increased slightly according to increasing influx in the direct vibration method and quantities of spray droplets in the aerosol method decreasing according to increasing liquid load h.

  • PDF

농업용 액체 분무용 초음파 분사효과에 관한 실험적 연구 (An Experimental Study on The Effect of Ultrasonic Atomization in Agricultural Twin-fluid Nozzle)

  • 정진도;임영재
    • 한국분무공학회지
    • /
    • 제8권4호
    • /
    • pp.1-8
    • /
    • 2003
  • The objective of this study is to investigate experimentally atomization characteristics for differently made an ultrasonic twin-fluid nozzle. A spray system, an ultrasonic system, and three different type(Nozzle type, Tube type, Conventional type)are made and tested by applied with ultrasonic energy. In this investigation, the measurement and calculation of spray droplet are to analyze the effects of ultrasonic energy on the agricultural atomization system. Through the measurement of suray angle, spray column using, high speed camera and PDA, it is found that nozzle type is highest efficiency than that of tube type and conventional type. It was found that the ultrasonic energy increased the atomization efficiency of spray droplets about 9% respectively and spray angle was wide spray.

  • PDF

전기분무에 의한 생분해성 폴리포스파젠 마이크로입자의 제조 (Fabrication of Biodegradable Polyphosphazene Microparticles by Electrohydrodynamic Atomization)

  • ;;유승곤
    • 폴리머
    • /
    • 제35권5호
    • /
    • pp.424-430
    • /
    • 2011
  • Biodegradable poly[(glycine ethyl ester)-(phenylalanine ethyl ester) phosphazene](PGPP) microparticles were fabricated by electrohydrodynamic atomization to apply drug release test. Atomization parameters such as applied voltage, polymer concentration, and molecular weight were investigated to inspect their effects on the size and morphology of microparticles. The average diameter of PGPP microparticles decreased as increasing applied voltage and solution flow rate. Dichloromethane/dioxane mixture shows better results for the preparation of microparticles than single solvent owing to the different PGPP solubility in solvent. Blending PGPP polymers with proper molecular weights not only favored the production of spherical PGPP microparticles via electrohydrodynamic atomization, but also provided a way to adjust drug (rifampicin) release behavior. Drug-loaded biodegradable polyphosphazene microspheres can be fabricated via electrohydrodynamic atomization, which has potential use in biomedical applications.

Atomization Characteristics and Prediction Accuracy of LISA-DDB Model for Gasoline Direct Injection Spray

  • Park, Sung-Wook;Kim, Hyung-Jun;Lee, Ki-Hyung;Lee, Chang-Sik
    • Journal of Mechanical Science and Technology
    • /
    • 제18권7호
    • /
    • pp.1177-1186
    • /
    • 2004
  • In this paper, the spray atomization characteristics of a gasoline direct-injection injector were investigated experimentally and numerically. To visualize the developing spray process, a laser sheet method with a Nd :YAG laser was utilized. The microscopic atomization characteristics such as the droplet size and velocity distribution were also obtained by using a phase Doppler particle analyzer system at the 5 ㎫ of injection pressure. With the experiments, the calculations of spray atomization were conducted by using the KIVA code with the LISA-DDB breakup model. Based on the agreement with the experimental results, the prediction accuracy of LISA-DDB breakup model was investigated in terms of the spray shapes, spray tip penetration, SMD distribution, and axial mean velocity. The results of this study provides the macroscopic and microscopic characteristics of the spray atomization, and prediction accuracy of the LISA-DDB model.

분무건조를 위한 회전원판의 미립화 특성에 관한 연구 (Atomization Chracteristics of Spinning Disk for Spray Dry)

  • 오재건;박기호;박준택;임상근
    • 한국산업융합학회 논문집
    • /
    • 제3권4호
    • /
    • pp.353-360
    • /
    • 2000
  • The purpose of this research is to find the fundamental data for the design and optimum operation condition for the disk atomization comparing the atomization characteristics of the modified straight vane type disk atomizer and the cup type atomizer widely used in the field of spray dry. First, the experimental comparison of the characteristics of $Na_2SO_4$ atomization has been carried out using the cup type disk atomizer and the three kinds of vane type atomization designed specially for the experiment. After the comparison of the experimental data of the $Na_2SO_4$ and raw milk have been conducted using vane type atomizer.

  • PDF

바이오디젤 연료의 혼합기 형성 및 미립화 증진 방안 (A Review on the Mixture Formation and Atomization Characteristics of Oxygenated Biodiesel Fuel)

  • 서현규
    • 한국자동차공학회논문집
    • /
    • 제22권1호
    • /
    • pp.183-192
    • /
    • 2014
  • In this work, the mixture formation and atomization characteristics of biodiesel fuel were reviewed under various test conditions for the optimization of compression-ignition engine fueled with biodiesel. To achieve these, the effect of nozzle caviting flow, group-hole nozzle geometry and injection strategies on the injection rate, spray evolution and atomization characteristics of biodiesel were studied by using spray characteristics measuring system. At the same time, the fuel heating system was installed to obtain the effect of fuel temperature on the biodiesel fuel atomization. It was revealed that cavitation in the nozzle orifice promoted the atomization performance of biodiesel. The group-hole nozzle geometry and split injection strategies couldn't improve it, however, the different orifice angles which were diverged and converged angle of a group-hole nozzle enhanced the biodiesel atomization. It was also observed that the increase of fuel temperature induced the quick evaporation of biodiesel fuel droplet.

GDI 엔진 인젝터의 연료 분무 거동 및 액적 분포 특성 (Spray Behaviors and Characteristics of Droplet Distribution in GDI injector)

  • 김민규;이창식;이기형;진 다시앙
    • 한국분무공학회지
    • /
    • 제6권2호
    • /
    • pp.16-21
    • /
    • 2001
  • This paper describes the macroscopic behavior and atomization characteristics of the high-pressure gasoline swirl injector in direct-injection gasoline engine. The global spray behavior of fuel injector was visualized by shadowgraph technique. The atomization characteristics of gasoline spray such as mean diameter and mean velocity of droplets were measured by the phase Doppler particle analyzer system. The macroscopic visualization and experiment of particle measurement on the fuel spray were investigated at 7 and 10 MPa of injection pressure under different spray cone angle. The results of this work show that the geometry of injector was more dominant over the macroscopic characteristics of spray than the fuel injection pressure and injection duration. As for the atomization characteristics, the increase of injection pressure resulted in the decrease of fuel droplet diameter and the atomization characteristics differed as to the spray cone angle. The most droplets had under $25{\mu}m$ diameter and for the large droplets(upper $40{\mu}m$) as the spray grew the atomization presses were very slow. Comparison results between the measured droplet distribution and the droplet distribution functions revealed that the measured droplet distribution is very closed to the Normal distribution function and Nukiyama-Tanasawa's function.

  • PDF

유해배기가스 저감을 위한 Hole형 노즐의 미립화 특성실험 (Atomization Characteristics Experiment of Hole Type Nozzle for the Reduction of Harmful Exhausted Gas)

  • 정진도;유병구
    • 한국분무공학회지
    • /
    • 제2권3호
    • /
    • pp.17-24
    • /
    • 1997
  • A simplified experiment was performed to figure out the atomization characteristics of rice-bran oil which it is highly viscous liquid by applying ultrasonic energy. A spray system, an ultrasonic system, and three kinds of hole-type nozzles(hole diameter: 0.31, 0.34, 0.37mm) were manufactured. To investigate the effects of ultrasonic energy on the atomization of a highly viscous liquid, a phase doppler particle analyzer was used for measurement and calculation of spray droplets data. Nozzle opening pressures were chosen of 3 levels, i.e, 16, 20, and 24MPa. As a result, it could be concluded that the ultrasonic energy was effective to improve the spray atomization when it applied to the fuel by means of 3 different nozzles because of the effects of the liquid fuel cavitation and relaxation between molecules caused by ultrasonic energy. The improvement rate of the spray atomization by the ultrasonic method compared with the conventional spray increased about 15% in the case of hole type nozzles. By increasing of the nozzle opening pressure and decreasing of the hole diameter, the atomization of spray droplets was improved.

  • PDF

금속 분말의 레이저 적층 시 표면 및 단면 특성에 관한 연구 (A Study on the Characteristics of Laser Deposition Surface and Cross-section for Metal Powder)

  • 황준호;신성선;정구인;김성욱;김현덕
    • Journal of Welding and Joining
    • /
    • 제34권4호
    • /
    • pp.17-22
    • /
    • 2016
  • In this study, we compared the physical and chemical properties evaluation for each size in the SUS316L metal powder produced by water atomization and gas atomization. and we analyzed the experimental data in order to find the basis of a suitable metal powder (SUS316L) for DED (Direct Energy Deposition) processing. Also it evaluated the properties of each layered surface and cross section according to the number of deposition and deposition speed. In the result of optical microscopy measurements, the metal powder by water atomization was the crack generated between the deposition layer, the deposition layer was poor quality. However, metal powder by gas atomization was obtained a relatively good deposition results than metal powder by water atomization.