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주은선(E. S. Ju),정석용(S. Y. Jeong),강대운(D. W. Kang),김종천(J. C. Kim) 한국자동차공학회 1997 한국 자동차공학회논문집 Vol.5 No.1
An experiment was conducted to figure out the atomization characteristics of a highly viscous biodiesel fuel with rice-bran oil applying and ultrasonic energy into it. A spray simulator for the droplet atomization, an ultrasonic system, and six different nozzels(3 pintle-type nozzles and 3 sin-gle hole-type nozzles) were made. To investigate effects of ultrasonic energy in a highly viscous liquid fuel, an immersion liquid method was used as a measurement method on droplet size distributions.<br/> It was found that the ultrasonic energy was effective .for the atomization improvement of the rice-bran oil as a highly viscous biodiesel fuel and the factors, such as the nozzle opening pressure, pin-edge angles, hole diameters, and collection distances affected the atomization of spray droplets.<br/>
주은선(Eun Sun Ju),송민근(M.G.Song),최우창(W.C.CHoi),박영호(Y.H.Park) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
The application of the ultrasonic atomization has been extended because of its good merits. Influx, liquid load, and physical properties are the effecting factors to the size of spray droplets. 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.<br/> Results show that the size distributions of liquid spray droplet by direct vibration method prevail over the aerosol method in uniform droplet size and as a whole, liquid droplet sizes and spray quantum are decreasing according to the head increasing.<br/>
주은선(Eunsun Ju),나우정(Woojung La),최우창(Woochang Choi) 한국자동차공학회 1999 한국 자동차공학회논문집 Vol.7 No.5
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 droplet 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.<br/> <br/>
수소 연료 생산의 효율향상을 위한 초음파 응용에 관한 연구 - 압력센서 계기에 의한 -
송민근,손승우,주은선,Song, Min-Guen,Son, Seung-Woo,Ju, Eun-Sun 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.9
The production of hydrogen fuel depends basically on the water electrolysis. The ultrasonic effects the decrease of the overpotential in a water electrolysis. A study on the overpotential which activates the hydrogen production is the core to elevate the hydrogen production efficiency on the principle. A pressure sensor system by a new idea is developed and applied. Solutions are 4 kinds of KOH concentration such as 0%, 10%, 20%, and 30%. Two frequency bands of the ultrasonic transducer are 28kHz and 2MHz. The directions of ultrasonic forcing are the vertical direction and the horizontal direction. The temperatures are two states, i.e., no constant and constant. Experiments are carried out sequentially in order in three cases of no ultrasonic forcing, ultrasonic forcing, and ultrasonic discontinution. In results, it is clarified that the ultrasonic effects the decrease of overpotential to elevate the efficiency of hydrogen production.