Coaxial or annular cylinder. In a sphere it's a spherical ring . If the remainder of the cutout is round it's a donut or toroid but Wikipedia shows a square toroid too.
April 2003, Volume 42, No. 4. 1. accuracy of the predicted pressures should be high with no need to adjust empirical model parameters. The cylinders are formally treated as a. Data from Walker and Al-Rawi(8). Inner radius of annulus was 2.221e-2 m and outer radius was 2.412e-2 m.
In this paper, the impacts of the location of a thermal source on buoyant convection of nanofluids in an annular region are analyzed numerically through the finite volume technique. Five different thermal source positions along the inner cylinderof the annulus have been analyzed.
As nouns the difference between cylinder and annulus. is that cylinder is (geometry) a surface created by projecting a closed two-dimensional curve along an axis intersecting the plane of the curve while annulus is a ring- or donut-shaped area or structure.
Show that the volume ux (i.e. the volumeof uid passing any section of the tube per unit time) is given by. The inner cylinder rotates with steady angular veloc-ity Ω about its axis and the outer cylinder is at rest. Flow in the Couette apparatus of an annular gap between two coaxial cylinders is unstable...