NUMERICAL ANALYSIS OF NATURAL CONVECTION IN INTERNALLY FINNED HORIZONTAL ANNULI | Zendy

Quanfu Gao | Zendy; Kun Zhang | Zendy; Liang Bi Wang | Zendy

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NUMERICAL ANALYSIS OF NATURAL CONVECTION IN INTERNALLY FINNED HORIZONTAL ANNULI

Author(s) -

Quanfu Gao,

Kun Zhang,

Liang Bi Wang

Publication year - 2020

Publication title -

frontiers in heat and mass transfer

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.404

H-Index - 18

ISSN - 2151-8629

DOI - 10.5098/hmt.14.29

Subject(s) - thermal fluids , natural convection , mechanics , frontier , heat transfer , thermal , mechanical engineering , environmental science , engineering , thermodynamics , convective heat transfer , physics , political science , law

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.

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