倾斜单相自然循环系统传热系数跃变研究
On the heat transfer coefficient jump in tilted single-phase natural circulation systems
摘要：
本研究探讨了倾斜对浮力驱动系统的影响。空腔、自然循环回路（NCL）和耦合自然循环回路（CNCL）已被用来代表浮力驱动系统的可能类别。有广泛的研究显示，腔系统的传热系数跳跃时，在倾斜的系统从一个稳定状态移动到另一个的变化。本研究的主要目的是调查，如果一个类似的行为发生在自然循环系统，如NCL和CNCL，使用2-D CFD研究。该研究确定了流型重排和流动方向反转的组合作为负责传热系数跳跃的现象。一个3-D CFD研究也进行了证明的现象的普遍性。计算流体动力学研究与文献中的数值和实验数据进行了充分的验证。还进行了参数研究，以检查的影响的纵横比，瑞利数，普朗特数和与NCL系统的平面倾斜。
英文摘要：
The present study investigates the effect of inclination on the buoyancy driven systems. A cavity, Natural Circulation Loop (NCL) and Coupled Natural Circulation Loop (CNCL) have been used to represent the possible classes of buoyancy driven systems. There are extensive studies on the cavity systems which exhibit a heat transfer coefficient jump upon the change in the inclination as the system moves from one steady state to another. The primary objective of the present study is to investigate if a similar behavior occurs in natural circulation systems such as an NCL and a CNCL, using a 2-D CFD study. The study identifies a combination of flow pattern rearrangement and flow direction reversal as the phenomena responsible for the jump in the heat transfer coefficient. A 3-D CFD study is also conducted to demonstrate the universality of the phenomena. The CFD study is validated thoroughly with the numerical and experimental data available in the literature. A parametric study is also conducted to examine the effects of the aspect ratio, Rayleigh number, Prandtl number and the inclination with the plane of the NCL system.
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