This paper reports upon an experimental investigation of gas dynamic rarefaction waves in rarefaction wave tubes to determine effects of large length to diameter ratios. A fitted equation is presented from which reasonable predictions can be made on the pressure deviation between a real and an ideal rarefaction wave. Transient boundary-layer effects cause an attenuation of the pressure which becomes more pronounced as the length to diameter ratio is increased. At a length to diameter ratio of 895, the pressure damping was essentially complete in one cycle for initial pressure ratios in excess of 1.6.

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