http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
GENERATION AND CHARACTERIZATION OF NANO SPRAY USING EHD NOZZLE
Koji TERASHIMA,Wamadeva BALACHANDRAN 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.10
The aim of this research is to generate and characterize nano-spray by conejet type ElectroHydro Dynamic atomization. Sprays produced by various nozzle types were observed under different operating conditions. Although it is relatively easy to produce very fine jet and drops with using insulating liquid such as Con oil, Ethanol etc., compared to conducting liquid like water, de-ionized-water is used as sample liquid in this research because it is too small to characterize insulating liquid spray. This is mainly because of the difference of conductivity and hence difference of charge relaxation tim e. It is possible to make steady con며et water spray, however, stable conejet atomization condition was very small. Compared to stable conejet atomization condition, quasi-stable conejet like atomization condition was large. In this case, the tip of the jet vibrates at very high speed causing the water jet breaks up, thus a mixture of very large as well as fine drops was produced during the short period of atomization. This problem could be minimized and even overcome by optimizing the size and the design of the nozzle. In quasi-steady condition, the jet diameter close to the breakup point was estimated to be less than 1㎛. In this condition, the drops generated are estimated to be in the submicron range.
Generation and Characterization of Nano Spray Using EHD Nozzle
( Koji Terashima ),( Wamadeva Balachandran ) 한국액체미립화학회 2005 한국액체미립화학회 학술강연회 논문집 Vol.2005 No.-
The aim of this research is to generate and characterize nano spray by conejet type ElectroHydroDynamic atomization. Characteristics of de-ionized-water sprays produced by various nozzle types were observed under different operating conditions. When ethanol was used as a sample liquid, it was relatively easy to generate a highly stable cone with a very fine liquid jet at the cone apex. As a result, very fine drops were obtained easily. On the other hand, Producing fine water drops by conejet mode electrospray was very difficult, mainly because of high conductivity and hence short charge relaxation time in water. Further, it is possible to make quasi-stable conejet like meniscus. In this case, the tip of the jet vibrates at very high speed causing the water jet breaks up, thus a mixture of very large as well as fine drops was produced during the short period of atomization. This problem could be minimized and even overcome by optimizing the size and the design of the nozzle. In quasi-steady condition, the jet diameter close to the breakup point was estimated to be less than 1μm. In this condition, the drops generated are estimated to be in the submicron range.
Effect of Nozzle Hole Configuration on Spray Characteristic For DI Diesel Engine
( Choong Won Lee ),( Young Jin Lee ),( Jong Won Park ),( Koji Terashima ) 한국액체미립화학회 2005 한국액체미립화학회 학술강연회 논문집 Vol.2005 No.-
Diesel injection systems aim at very high injection pressure as this proven to effectively emission reduction strategies. The trend towards higher injection pressures is accompanied by ever smaller nozzle hole cross sections. This results in growing influence and practical importance of nozzle hole geometry, both on the macroscopic scale as defined by nozzle hole length, diameter, and inlet or outlet radius, but also by microscopic geometry given by the roughness of the nozzle hole surface. Also these causes wall impinging phenomenon, endurance and flow rate controlling difficulties, but also increasing CO, HC emission at part load condition. The paper describes new concepts injector for diesel engine which were designed the realization of the good atomization quality and low emission such as PM and NOx even under the low injection pressure. The focus of this experimental study was investigated the nozzle hole geometry effects for common rail injection. The experimental conditions (ambient temperature, ambient pressure) were held constant.