This paper examines effects of temperature gradient on the propagation of an acoustic solitary wave in an air-filled tube with an array of Helmholtz resonators. With neglect of viscosity and heat conduction, interest is focused on the effects due to axial nonuniformity of the temperature and density of air in undisturbed state. On the basis of the nonlinear wave equations for unidirectional propagation of plane waves, evolutions of the acoustic solitary wave are sought numerically in two cases where the temperature increases or decreases linearly along the tube. Discussions are given by comparing the present problem with the one of propagation of a shallow-water soliton over variable topography.
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