Parameter of Nonlinearity in Fluids

Abstract

Increased interest in the nonlinear effects of finite amplitude sound makes imperative a better knowledge of the departure of fluids from a linear behavior. This nonlinearity is reflected in terms of the parameter 1 + ρ0/2c02(∂2β/∂ρ2)s. Values of this derivative for liquids have been almost wholly lacking in the literature. What data are available have now been used to compute the parameter for about a dozen liquids. Results are compared with those commonly cited in finite amplitude work. Discrepancies are also discussed. (Supported in part by the Office of Naval Research.)