Drag of circular cylinder under transverse rarefied gas flow
Abstract
A formula is presented giving the drag coefficient for low Renumber slip flow normal to the axis of an infinite circular cylinder. The equation is not confined to tangential accommodation coefficients of the order of unity. In contrast to the nonslip case a viscous normal stress acts across the cylinder surface. Under perfect slip the two normal stresses in common are even larger than under nonslip. For zeta = 1.0 the friction drag is already reduced to 15 % of its nonslip value.
 Publication:

Contributions on Transport Phenomena in Fluid Mechanics and Related Topics
 Pub Date:
 April 1977
 Bibcode:
 1977tubc.rept...65G
 Keywords:

 Aerodynamic Coefficients;
 Aerodynamic Drag;
 Circular Cylinders;
 Rarefied Gases;
 Slip Flow;
 Stokes Law (Fluid Mechanics);
 Subsonic Flow;
 Viscous Drag;
 Fluid Mechanics and Heat Transfer