http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
지명국(M. K. ji),박기태(G. T. Park),정효민(H. M. Jeong),정한식(H. S. Chung) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The aim of this research is to analyze the influence of variable motive pressure and driving nozzle position on the performance of ejector. The experiment was conducted in the variation of motive pressure of 1, 2, 3 and 4㎏/㎠ respectively. The position of driving nozzle was varied in difference locations according to mixing tube diameter. The results is show that the suction flow rate of ejector is influenced by the driving nozzle position at the location of 1d of mixing tube diameter the performance of ejector gives the best value of suction flow rate.
디퓨져 목 길이에 따른 이젝터의 성능 특성에 관한 연구
지명국(M. K. Ji),토니우토모(Tony U. M.),박기태(G. T. Park),정효민(H. M. Jeong),정한식(H. S. Chung) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Most industrial processes use a significant amount of thermal energy, mostly by burning fossil fuels. Some part of the energy released in combustion is inevitably rejected to the surroundings as waste. This waste heat can be utilized in certain types of refrigeration system such a jet refrigeration cycle. The influence of the ejector system depends on a mixing by the shearing action between the primary flow and the secondary flow, the pressure loss by the shock wave at the ejector throat, the pressure recovery of a diffuser and etc. And the shape of the component elements for comprising influence is the important design parameters. Thus, in this study the condition that it can maintain the optimum operation state of the ejector system according to a change including the aspect ratio of the exit position of the driving nozzle, the length of the diffuser throat.
지명국(M. K. Ji),박기태(G. T. Park),정효민(H. M. Jeong),정한식(H. S. Chung) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.11
The aim of this research is to analyze the influence of variable motive pressure and driving nozzle position on the performance of ejector. The experiment was conducted in the variation of motive pressure of 1, 2, 3 and 4㎏/㎠ respectively. The position of driving nozzle was varied in difference locations according to mixing tube diameter. The results is show that the suction flow rate of ejector is influenced by the driving nozzle position at the location of I d of mixing tube diameter the performance of ejector gives the best value of suction flow rate.
Study on the Characteristics of Channel Flow in Plate Heat Exchanger
Z. H. Jin(김진화 ),M. K. Ji(지명국 ),K. S. Lee(이광성 ),C. P. Kim(김철표 ),H. S. Chung(정한식 ),H. M. Jeong (정효민 ) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.6
In this paper, presented pressure drop characteristics in a channel of plate heat exchanger by experimental method. Plate Heat Exchanger(PHE) have become popular in chemical, power, food and refrigeration industries due to the efficient heat transfer performances, extremely compact design and flexibility of extend or modify to suit changed duty. In the experiment, test section constructed by two corrugated plates with 60 degree of chevron angle. Consequently, experiments carried out the pressure profile along 15 measure points according to mass flow rate. This results provided to investigate flow characteristics of PHE channel flow that highly turbulent even with low Reynolds number. Moreover, numerical simulation was compared with experimental results and present flow behavior in the test section.