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RISS 인기검색어
- 검색키워드
- 저자 : Xiaohang Qu (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Qu, Xiaohang,Revankar, Shripad T.,Tian, Maocheng Elsevier 2017 Nuclear engineering and design Vol.320 No.-
<P><B>Abstract</B></P> <P>Bubble formation and condensation of steam-air mixture vertically injected in a subcooled water pool was simulated, combining thermal phase change model into the two continuous phase free surface model of ANSYS CFX 17.1. Continuous surface force model was used to calculate surface tension force and the influence of non-condensable gas was accounted for by component transportation equation and assumption of interface temperature equal to saturation temperature at local partial steam pressure. The thermal phase change model includes an experimental correlation for liquid side sensible heat transfer. Based on available experiment data from literatures, singular pure steam bubble and steam-mixture bubble in a pool were first simulated to see the predictability of the proposed method and then, the same method was applied to the bubble formation, detachment and condensation process of injected steam air mixture from a nozzle. Bubble dimeter, water subcooling and non-condensable gas concentration studied range from 4.9mm to 50mm, 12K to 40K, and 0 to 31.5% respectively. The results of the computations indicate that the present method can predict very well the bubble formation and condensation both for pure steam case and with non-condensable gas.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Bubble formation and condensation process injected from a nozzle is studied numerically. </LI> <LI> Euler-Euler two-fluid free surface model and species model from are coupled together. </LI> <LI> Influence of non-condensable gas is considered. </LI> <LI> Bubble shape variation histories are shown in comparison with experiments. </LI> </UL> </P>
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Influence of flow-induced oscillating disturbance on the surface heat transfer of impingement flow
Xiaohang Qu,Xiaoni Qi,Qianjian Guo,Yongqi Liu 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.11
Flow-induced oscillation is an effective way to enhance heat transfer, which requires no extra energy consumption and can prevent fouling and soot formation. To test the flow-induced oscillation effect on the heat transfer of impingement flow, an 18 mm wide and 30 m thick membrane tape was mounted at the exit of the ejection pipe. As the ejection Reynolds number increased from 5280 to 9827, the oscillating frequency also increased. In addition, three different oscillating regimes were observed, these being quasi-still, 2D-oscillating and 3D-oscillating, with the transition Re depending on the tape length. The heating plate was 3D-printed and electrical heating wires were embedded within it so as to predetermine the local heat flux by numerical analysis, and be able to calculate the heat transfer coefficient (HTC). The results demonstrate that heat transfer enhancement is more prominent in the vertical direction to the tape than in the parallel direction. Moreover, the distinctive heat transfer enhancement effect near the plate center becomes weaker as it goes toward the outside of the plate, and even turns negative with an increasing r/D. Using a longer piece of tape or having smaller intervals between the tape tip and plate was also shown to improve the heat transfer effect. The spontaneous oscillating disturbance method shows great promise for heat transfer regulation in impingement flow.
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