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직사각형 덕트에서 Reiner-Rivlin 유체의 이차유동 및 열전달에 관한 수치해석
정석호,손창현,신세현,Jung, Suk Ho,Sohn, Chang Hyun,Shin, Sehyun 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.9
The present numerical study investigates the effect of a secondary flow on the heat transfer in order to delineate the mechanism of laminar heat transfer enhancement of a viscoelastic fluid in rectangular ducts. The second normal stress generating a secondary flow is modeled by adopting the Reiner-Rivlin constitutive equation and the calculated secondary flow showed good agreement with experiments. The primary velocity U as well as the pressure drop were not affected by the secondary flow in rectangular ducts, whose order of magnitude is less than 0.1% of the primary velocity. The small magnitude of the secondary flow, however, affect moderately the temperature fields. The calculated Nusselt numbers with secondary flow show 50% heat transfer enhancement over those of a purely viscous non-Newtonian fluid, which are considerably lower than the experimental values. Therefore, we conclude that there should be an additional heat transfer enhancement mechanism involved in the viscoelastic fluid such as temperature-dependence.
[기술논문] IMO 2단계 규제 대응 중속 4행정 디젤엔진의 친환경 기술
정석호(Jung Sukho),고대권(Koh Daekwon) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.5
NOx regulation of Tier II reduced by 20% more than Tier I had been entered into force 1 January 2011 by International Maritime Organization All maker of diesel engine for ship had tried to achieve through pre-treatment chamber, fuel injection and intake and exhaust system. In this paper, technologies that satisfied the NOx regulation of Tier II through the modification to these parts were introduced.