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Heat Transfer Research
インパクトファクター: 1.199 5年インパクトファクター: 1.155 SJR: 0.267 SNIP: 0.503 CiteScore™: 1.4

ISSN 印刷: 1064-2285
ISSN オンライン: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.v41.i1.10
pages 1-19

Generation of Helicity and the Critical Transitions in a Twisted Flow of a Single-Phase Liquid

Olga Viktorovna Mitrofanova
National Research Nuclear University "Moscow Engineering PhysicsInstitute" (MEPhI), 31 Kashirskoe shosse, Moscow, 115409, Russia

要約

Equations to determine the rate of change of the helicity in a dynamic liquid system are obtained. For the convenience of carrying out engineering calculations the equations are presented in dimensional and dimensionless forms. The conditions for critical transition to a helical character of a twisted flow and to the crisis-induced rearrangement of the flow velocity field due to the change in the flow vortex structure are considered.
A new physical model of the vortex motion of a liquid is suggested. It allows one to explain a number of phenomena: the effect of spontaneous flow twisting in the collectors of tank-type nuclear reactors; the reason for the considerable increase in the nonuniformity of the radial distribution of pressure at the inlet into the active zone for liquid-metal heat-transfer agents as compared to the water one; the crisis-induced rearrangement of the flow velocity field with formation of large-scale vortex structures during flow in curvilinear channels and of spiral vortices on curvilinear surfaces.


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