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DEM 계산력 변수에 의한 교반분쇄볼밀의 분쇄속도상수 연구
김성수(S.S. Kim),박기태(G.T. Park),정한식(H.S. Chung),최희규(H.K. Choi) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
In study of grinding mechanism, theological equations for grinding process have been used which are based on material balance. The solution of such equations are generally not given. To study for grinding rate K of a stirred ball mill, it was simplified and conditioned to calculate movement of all balls by using DEM (Discrete Element method) simulation. The grinding rate K is expressed as K=a exp(bn) by experiments. To identify relation between K and DEM simulation results, as new conception, calculate force F<SUB>cal</SUB> are introduced and it is defined as F<SUB>cal</SUB> = average force acting on one ball x coordination number. With F<SUB>cal</SUB>, grinding rate K could be expressed as K = a'F<SUB>cal</SUB>+ b'.
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.
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.