Flow Uniformalizing Effect of Dual Damping Screens in Pipe Flow : The Case of an Axi-Symmetric Perturbation

Abstract

The effect of dual damping screens on the velocity distribution of pipe flow is analysed theoretically. The flow is assumed to be incompressible and inviscid. In this paper the case of an axi-symmetric flow is treated applying a small perturbation method. The mechanism of uniformalizing a velocity distribution of pipe flow is made clear. In case of a single screen, the damping process in pipe flow is similar to that in a two-dimensional flow treated by Taylor & Batchelor. The use of dual damping screens with each pressure loss coefficient greater than 2.0, which are set tandem with the non-dimensional axial distance L'/D of 0.51.0, gives a very uniform velocity distribution downstream of the screens, and here is a possibility of giving a very stable damping screen for contamination.