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석탄(石炭)의 유동층(流動層) 연소(燃燒)에 관(關)한 S. ENDRENYI와 B. PALANCZ의 수학적(數學的) 수정(修正)모델(비표면적(比表面積) 변화(變化)의 영향(影響))
김명준,이관석,서정윤,Kim, M.J.,Rhee, K.S.,Seo, J.Y. 대한설비공학회 1988 설비저널 Vol.17 No.1
A numerical analysis of the mathematical model for fluidized bed coal combustion has been performed. Based on the physical nature of the specific surface variation due to the decreasing of coal particle diameter according to the combustion process, the modified model which has been added the specific surface variation to the S.ENDRENYI and B.PALANCZ's mathematical model was established in this study. From the numerical analysis of these two models, it was found that the perfect combustion time is increasing largely at least 5 seconds in the modified model in comparison with that of the S.ENDRENYI and B.PALANCZ's model, and the bed temperature and the coal particle surface temperature during the main combustion period represent constant with time in the S.ENDRENYI and B.PALANCZ's model, on the other hand, these properties are decreasing linearly with time in the modified model.
마이크로히터에서 반주기 정현곡선의 열부하에 의한 비정상 열전달 연구
김명준(M. J. Kim),이희준(H. J. Lee) 한국전산유체공학회 2014 한국전산유체공학회지 Vol.19 No.4
A numerical study of transient conjugate heat transfer on micro heater in a micro-channel substrate under a sinusoidal heat load was conducted. It was found that the time constant is not affected by the maximum heating magnitude of the sinusoidal heat load. However, the time constant increases with low duration of the sinusoidal heating period and low Reynolds number. Moreover, there is a threshold where a heater temperature do not reach to time constant at low thermal diffusivity, low flow rate, and low pulse duration of the sinusoidal heating. The time constant should be considered for transient convective heat transfer under transient sinusoidal heat load in a micro heat sink.