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Sunspots and the physics of magnetic flux tubes. III - Aerodynamic liftThe aerodynamic lift exerted on a magnetic flux tube by the asymmetric flow around the two sides of the tube is calculated as part of an investigation of the physics of solar flux tubes. The general hydrodynamic forces on a rigid circular cylinder in a nonuniform flow of an ideal fluid are derived from the first derivatives of the velocity field. Aerodynamic lift in a radial nonuniform flow is found to act in the direction of the flow, toward the region of increased flow velocity, while in a shear flow, lift is perpendicular to the free stream and directed toward increasing flow velocity. For a general, three dimensional, large-scale stationary incompressible equilibrium flow, an expression is also derived relating the lift per unit length to the dynamical pressure, cylinder radius and the gradient of the free-stream velocity. Evidence from an asymmetric airfoil in a uniform flow indicates that lift is enhanced in a real fluid in the presence of turbulence.
Document ID
19790057331
Document Type
Reprint (Version printed in journal)
Authors
Parker, E. N. (Chicago, University Chicago, Ill., United States)
Date Acquired
August 9, 2013
Publication Date
July 1, 1979
Publication Information
Publication: Astrophysical Journal
Subject Category
SOLAR PHYSICS
Funding Number(s)
CONTRACT_GRANT: NGL-14-001-001
Distribution Limits
Public
Copyright
Other