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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/>
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.