Numerical Analysis of General Trends in Single-Phase Natural Circulation in a 2D-Annular Loop | Zendy

Gilles Desrayaud | Zendy; Alberto Fichera | Zendy

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Numerical Analysis of General Trends in Single-Phase Natural Circulation in a 2D-Annular Loop

Author(s) -

Gilles Desrayaud,

Alberto Fichera

Publication year - 2008

Publication title -

science and technology of nuclear installations

Language(s) - English

Resource type - Journals

eISSN - 1687-6083

pISSN - 1687-6075

DOI - 10.1155/2008/895695

Subject(s) - thermosiphon , mechanics , natural circulation , natural convection , loop (graph theory) , hopf bifurcation , pitchfork bifurcation , bifurcation , convection , constant (computer programming) , heat flux , vortex , flow (mathematics) , physics , thermodynamics , heat transfer , mathematics , nonlinear system , computer science , combinatorics , quantum mechanics , programming language

The aim of this paper is to address fluid flow behavior of natural circulation in a 2D-annular loop filled with water. A two-dimensional, numerical analysis of natural convection in a 2D-annular closed-loop thermosyphon has been performed for various radius ratios from 1.2 to 2.0, the loop being heated at a constant flux over the bottom half and cooled at a constant temperature over the top half. It has been numerically shown that natural convection in a 2D-annular closed-loop thermosyphon is capable of showing pseudoconductive regime at pitchfork bifurcation, stationary convective regimes without and with recirculating regions occurring at the entrance of the exchangers, oscillatory convection at Hopf bifurcation and Lorenz-like chaotic flow. The complexity of the dynamic properties experimentally encountered in toroidal or rectangular loops is thus also found here

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