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설승윤(S.Y. SeoL),허광수(K.S. Her) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.9
Regenerative burner is used to increase the temperature of air in the industrial burner system. Highly preheated air increases the heating potential of flue gas. The recent studies of regenerative burner system are focused to reduce NOx generation, but thermodynamic analysis is seldom performed. In this paper, energy balance equations are analysed for regenerative burner system and the result is compared to a simple heating system. The effects of operating frequency and heat capacity of regenerator are studied. The results show that it is necessary to reduce the operating frequency to increase the maximum furnace temperature. In ideal case, the maximum furnace temperature using regenerative burner system is twice as much that of simple heating system. The heat capacity of regenerator also affects the maximum furnace temperature and rising time. To reduce the rising time of furnace temperature, the heat capacity of regenerator also must be reduced. However, the operating frequency must be reduced to get higher maximum temperature with the small value of heat capacity.
윤영석(Y.S. Yun),김영봉(Y.B. Kim),설승윤(S.Y. Seol) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
Cyclone is a kind of device using to disjunct the foreign matter like dust from the fluid flowing due to the centrifugal force. In most case, the precipitation efficiency of the cyclone should be defined from the cut size which determine the fine degree. But the fluid flowing from inlet to outlet will cause the pressure drop that lead the decrease oj the efficiency since exists the electricity consumption. So, the analysis could focus on the 3D turbulent flow of the Stairmand HE tangential inflow type cyclone due to the relative higher precipitation efficiency. And through the segmentation of the Vortex-Finders internal space, the characteristic can be known well. The largest pressure drop can be found at Vortex-Finder part and the relationship between Tangential velocity and axial velocity is also realized well.
손봉준(B.J.Son),설승윤(S.Y.Seol) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
In this paper, the current lead for superconducting device is studied by numerical method. The current lead is<br/> cooled by surrounded N2 gas by natural convection. The heat conduction equation for current lead and<br/> boundary layer equation for N2 gas must be solved simultaneously. The boundary layer equation for N2 gas is<br/> highly nonlinear for varied temperature of current lead. So the linearization method is adopted for simplicity.<br/> Numerical results using natural convection cooling are compared with the conventional cooling methods such<br/> as conduction cooling and vapor cooling methods. The main difference of natural convection cooing is the<br/> non-zero temperature gradient at the top of current lead for the minimum heat dissipation into superconducting<br/> devices. For the optimized conduction-cooling and vapor-cooling current leads, the temperature gradient at the<br/> top of current lead is zero. Also, the heat flow at the cold end is much smaller than conduction cooling case.