Accession Number : ADA322731

Title :   Damping in Rarefield Nonsteady Flows (AASERT FY93).

Descriptive Note : Final rept. 1 Sep 93-31 Aug 96,

Corporate Author : STANFORD UNIV CA

Personal Author(s) : Whitleck, Sarah ; Baganoff, Donald

PDF Url : ADA322731

Report Date : 20 DEC 1996

Pagination or Media Count : 23

Abstract : When a fluid flow is composed of several gas species having different molecular weights and molecular composition, such as air, in particular at high temperature, various nonequilibrium effects lead to well-known changes in the flow structure over that for a simple gas. These are frequently termed relaxation effects when associated with nonequilibrium of the vibrational modes of a polyatomic molecule, chemical composition of a dissociating molecule, or degree of ionization of an ion. Relaxation effects also arise owing to a difference in the molecular weights of two species making up a flow, which introduces a time lag in the transfer of translational energy between the two.

Descriptors :   *DAMPING, *ENERGY TRANSFER, *RELAXATION TIME, *FLUID FLOW, POLYATOMIC MOLECULES, MOLECULAR VIBRATION, HIGH TEMPERATURE, MOLECULAR WEIGHT, GASES, CHEMICAL COMPOSITION, IONIZATION, NONEQUILIBRIUM FLOW, TIME LAG THEORY.

Subject Categories : Fluid Mechanics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE