Numerical Analysis of Natural Convection in a Cylindrical Envelope with an Internal Concentric Cylinder with Slots

作者：Zhang, Kun; Yang, Mo^*; Zhang, Yuwen

来源：Numerical Heat Transfer Part A-Applications, 2011, 59(10): 739-754.

DOI：10.1080/10407782.2011.572762

• HORIZONTAL ANNULUS
• HEAT-TRANSFER
• FLOW PATTERNS
• BIFURCATION
• CAVITY

Detailed numerical analysis is presented for natural convection heat transfer in a cylindrical envelope with an internal concentric cylinder with slots. Governing equations are discretized using the finite volume method, and solved using SIMPLE algorithm with QUICK scheme. The results show that the system can reach steady state and be symmetric when the Rayleigh number is below 4x105. When the Rayleigh number is greater than 6x105, an asymmetric periodical solution is obtained although the initial field and boundary conditions were symmetric. As the Rayleigh numbers increase further, a quasi-periodic solution of the system is achieved at Ra=2x106, and the periodicity is lost at Ra=6x106. It is ascertained that the oscillatory flow undergoes several bifurcations and ultimately evolves to a chaotic flow.

• 出版日期2011
• 单位上海理工大学