Numerical analysis of natural convection in internally finned horizontal annuli

被引：0
作者：
Gao Q. [1 ,2 ]
Zhang K. [1 ,2 ]
Wang L.B. [1 ,2 ]
机构：
[1] School of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, Gansu
[2] Key Laboratory of Railway Vehicle Thermal Engineering of MOE, Lanzhou Jiaotong University, Lanzhou, 730070, Gansu
来源：
Frontiers in Heat and Mass Transfer | 2020年 / 14卷
基金：
中国国家自然科学基金;
关键词：
Annuli; Bifurcation; Natural convection; Numerical simulation; Rayleigh number;
D O I：
10.5098/hmt.14.29
中图分类号：
学科分类号：
摘要：
Detailed numerical analysis is presented for natural convection heat transfer in internally finned horizontal annuli. Governing equations are discretized using the finite volume method, and solved using SIMPLE algorithm with Quick scheme. The results show that the flow and heat transfer can reach steady state when the Rayleigh number is below 2×104. When the Rayleigh number is greater than 3×104, two different types of numerical solutions under the same parameters can be obtained for different initial conditions. The critical Rayleigh numbers with two different initial conditions are different from steady to unsteady solutions. The oscillatory flow undergoes several bifurcations and ultimately evolves to a chaotic flow as the Rayleigh numbers increase. © 2020, Global Digital Central. All rights reserved.
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页码：1 / 10
页数：9
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