TRANSPORT PROPERTIES IN NON-EQUILIBRIUM AIR MIXTURES

Period of Performance: 01/01/1990 - 12/31/1990

$49.8K

Phase 1 SBIR

Recipient Firm

Hansen Research Associates
P.o. Box 30133
Eugene, OR 97403
Principal Investigator

Abstract

THE PROPOSAL IS (1) TO DETERMINE HOW CLOSELY SIMPLE, WEIGHTED CROSS SECTIONS CAN MATCH THE COLLISION INTEGRALS OF THE CHAPMAN-COWLING FORMULATION, AS A FUNCTION OF TEMPERATURE; (2) TO DEMONSTRATE THAT SIMPLE FORMULAE FOR VISCOSITY, THERMAL CONDUCTIVITY, AND MASS DIFFUSION OF GAS MIXTURES APPROXIMATE THE FUNCTIONAL FORM OF MORE EXACT MODELS; AND (3) TO FIND EMPIRICAL ADJUSTMENTS OF THE CROSS SECTIONS AND/OR CONSTANT COEFFICIENTS IN THE MIXTURE FORMULAE WHICH WILL NOT ONLY RETAIN THE PROPER FUNCTIONAL FORM BUT WILL ALSO QUANTITATIVELY REPRODUCE MORE EXACT MODELS. THE OBJECTIVE IS TO PROVIDE A FAST EFFICIENT ALGORITHM WHICHCAN BE USED IN COMPUTATIONAL FLUID DYNAMICS PROGRAMS WITH THE MOST SPEED POSSIBLE SO THAT THESE PROGRAMS CAN FIND SOLUTIONS TO COMPLEX, NON-EQUILIBRIUM AIRFLOW CONDITIONS IN REASONABLE COMPUTATION TIMES. THE METHODS DEVELOPED WILL ALSO PROVIDE A BASIS FOR QUICK CALCULATION OF TRANSPORT PROPERTIES OF GAS MIXTURES OTHER THAN AIR.