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직접접촉식 LNG기화기 응용을 위한 칼럼 열교환기 기포특성에 관한 연구
김성종,한승탁,김종보,Kim, S.J.,Han, S.T.,Kim, J.B. 대한설비공학회 1991 설비공학 논문집 Vol.3 No.2
In the present investigation, it has been proposed to utilize a direct contact heat exchanger as an evaporator to solve the difficulties such as scaling, corrosion and law thermal efficiencies, associated with the conventional evaporator. Liquified nitrozen was utilized as a working fluid to investigate basic natures of bubble dynamics in the evaporator, and spray nozzles were adopted to inject liquified nitrozen into the spray column with varying flow rates of dispersed phase fluids. Experimentations were carried out in the range of $6.54{\times}10^{-4}kg/s$ - 0.030 kg/s for dispersed phase flow rates with one, three and five nozzle holes. Observing the bubble dynamics for the evaporator the feasibility of utilizing a direct contact heat exchanger as a LNG evaporator has been evaluated. The results show that no eruption phenomena was observed in the present investigation with $LN_2$ and the interface between $N_2$ bubbles and water was fully turbulent. It is believed that the high injection velocity of $LN_2$ through the spray nozzles provide good mixing effects for both heat and mass transfers between water and $N_2$ bubbles. Ice was formed on the surface of the spray nozzle for higher $LN_2$ flow rates. However, even in this case, it is observed that the ice was detached as soon as it was formed. Under the present experimental conditions, the shapes of $LN_2$ bubbles were in the spherical-cap region according to the Clift, Grace and Weber Graphs. The height of foam region caused by the breakup of larger bubbles keeps increasing with high injection velocities until it reaches it's maximum height.
김성종,장경환,진영철,정경락 ( S . J . Kim,G . H . Chang,Y . C . Jin,G . R . Jheong ) 한국열처리공학회 1994 熱處理工學會誌 Vol.7 No.1
Anatase TiO₂particles prepared by experiment were used to study the change of crystal structure by calcination temperature. The results were as follows. Crystallite size of anatase TiO₂particles increased with calcination temperature. The rate of increasing the crystallite size of anatase TiO₂particles was decreased below 700℃ and was markedly increased above 700℃. Unit cell volume of TiO₂was expanded at low temperature and was contracted at high temperature. This result means that the growth of crystallite size was occured in the direction.
김성종,장경환,변윤섭,진영철,정경락 ( S . J . Kim,G . H . Chang,Y . S . Byuon,Y . C . Jin,G . R . Jheong ) 한국열처리공학회 1993 熱處理工學會誌 Vol.6 No.4
The preparation of TiO₂fine particles from TiCl₄and oxygen by the vapor-phasereaction was investigated at 850℃ with an emphasis on the effect of its experimental conditions on the crystal type of the products. Anatase TiO₂particles prepared by experiment were used to study anatase-rutile transition by calcination temperature, the additives and gas atmosphere. The results were as follows. The kinetics of anatase-ruble transition was well agreed with Avrami equation, and the activation energy of transition was 35㎉/㏖. The addition of CuO in anatase TiO₂particles accelerated the anatase-ruble transition, and its transition was retarded in vaccum.
유원희(W. H. You),김성종(S. J. Kim),이희성(H. S. Lee),김만철(M. C. Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
In this paper the dynamic characteristics of railway vehicle on turnout was analyzed by using Ⅵ-rail S/W. The derailment coefficient, wheel load, lateral force on the wheel, attack angle and vertical displacement of wheels are included in dynamic characteristics of railway vehicle.
해양환경 변화가 알루미늄합금 희생양극의 효율에 미치는 영향에 관한 연구
김성종(S. J. KIM),김도형(D. H. KIM),이명훈(M. H. LEE),김기준(K. J. KIM),문경만(K. M. MOON) 한국해양공학회 2000 韓國海洋工學會誌 Vol.14 No.2
Recently, it was reported that the life of Al Sacrifical anode is being used in port piers has been significantly shortened, compared with the original design life (e.g. average life shortened from 20 years to 13~15 year). Those factors involving these problems mentioned above were seemed to be a quality of anode material and diverse environmental factors, such as pH, flow rate, temperature, Dissolved oxygen, Chemical oxygen demand and resistivity etc. In this study, flow rate and contamination degree(pH) of sea water affecting to sacrificial anode life have been investigated in terms of electrochemical characteristics of Al alloy sacrificial anode. It was known that the lifetime of Al alloy anode was shortened not only by increasing of self-corrosion quantity by varying flow rate of sea water but also by increasing corrosion current density due to the potential difference increment between Al anode and steel structure cathode by varying contamination degree of sea water. Especially when anode current density is from 1 mA/㎝² to 3mA/㎝² and flow rate of sea water is under 2m/s, anode current efficiency is 90% above. However flow rate is over 2m/s anode current efficiency fell down sharply due to erosion corrosion as well as galvanic corrosion.