基于傅里叶级数的含共轭效应的倾斜闭环浮力驱动换热器动力学建模
Fourier series based modeling of the dynamics of inclined closed loop buoyancy driven heat exchangers with conjugate effect
AI总结：
本文用傅里叶级数建立含壁面导热的倾斜闭环浮力驱动换热器一维模型，经三维CFD验证，揭示壁面导热与倾斜对瞬态行为及流动反转的显著影响。
摘要：
本研究提出了对倾斜闭环浮力驱动换热器动力学的建模，并在换热器处纳入了壁面导热效应。耦合自然循环回路（CNCL）是研究闭环浮力驱动换热器的理想系统。该建模利用基于傅里叶级数的方法建立一维模型，随后通过相应工况的三维CFD研究进行验证。一维模型与三维CFD数据吻合良好，表明该一维模型适用于瞬态行为预测。识别了支配CNCL动力学的无量纲数和热耦合灵敏度系数，并进行了相应的参数研究。结果表明，壁面导热和倾斜对CNCL系统的瞬态行为有显著影响。观察到共轭CNCL系统换热系数随倾斜变化出现跃变。对于零流场初始条件，该一维模型还能够捕捉共轭CNCL系统随倾斜变化而发生的流动方向反转。
英文摘要：
The modelling of the dynamics of inclined closed loop buoyancy driven heat exchangers with inclusion of the wall conduction effect at the heat exchanger is presented in the current study. A Coupled Natural Circulation Loop (CNCL) is an ideal system for studying the closed loop buoyancy driven heat exchanger. The modelling utilises a Fourier series based approach to develop a 1-D model which is then verified with the 3-D CFD studies of the respective cases. A good agreement is observed with the 3-D CFD data, which demonstrates the suitability of the 1-D model for transient behaviour prediction. The non-dimensional numbers and thermal coupling sensitivity coefficients which govern the dynamics of the CNCL are identified and an appropriate parametric study is conducted. Results show that the wall conduction and inclination have a significant effect on the transient behaviour of the CNCL system. A jump in the heat transfer coefficient with variation in the inclination of the Conjugate CNCL system is observed. The 1-D model is also able to capture the flow direction reversal with change in the inclination of the Conjugate CNCL system for zero flow field initial conditions.
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