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Heat Transfer Research

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ISSN Print: 1064-2285
ISSN Online: 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

O. V. Mitrofanova
Moscow Engineering and Physical Institute (State University), 31 Kashirskoe shosse, Moscow, 115409, Russia

ABSTRACT

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.