Fig. 12From: On the accuracy of macroscopic equations for linearized rarefied gas flowsSound amplitude pL at the receiver as function of the dimensionless length \(\sqrt \pi \varpi {L}/v_{m}\), where pL is normalized by p0u0/vm. Solid lines represent the accurate results from the Shakhov model (44) solved by the discrete velocity method [69], that is, doubling the number of spatial and discrete velocity points gives the same results. Solid squares (experimental data) are collected from Ref. [56] when the gas medium is helium. τc=μ/p0 is the average collision time of gas moleculesBack to article page