Abstract
Sequences of pictures which show the evolution of two patterns between their continuum and free-molecule limits are presented. The first sequence examines the flow through an orifice as the orifice Knudsen number is decreased while the pressure ratio across the orifice is kept constant. The second sequence examines the flow about a washer placed at a fixed distance downstream of the orifice as the orifice Knudsen number is decreased. The effects of the first molecular collisions upon the flow pattern are clearly shown in both sequences of pictures. The photographs were obtained by employing the resonance scattering of sodium light by sodium vapor to make the flow visible in a rarefied-gas-dynamic wind tunnel.
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