title: A nonlinear model of thermoacoustic devices.
abstract: This paper presents a nonlinear, time-domain model of thermoacoustic devices based on cross-sectional averaged equations. Heat transfer perpendicular to the device axis--which lies at the core of thermoacoustic effects--is modeled in a novel and more realistic way. Heat conduction in the solid surfaces surrounding the fluid medium is included. Contrary to the previous versions of this model [Watanabe et al., J. Acoust. Soc. Am. 102, 3484-3496 (1997)], the present version does not require artificial damping and is numerically robust. The model performance is illustrated on several examples: a prime mover, an externally driven thermoacoustic refrigerator, and a combined prime mover/refrigerator system.
authors.affiliation: Department of Mechanical Engineering, The Johns Hopkins University Baltimore, Maryland 21218, USA.
authors.forename: Sergey
authors.initials: S
authors.lastname: Karpov
authors.forename: Andrea
authors.initials: A
authors.lastname: Prosperetti
mesh_terms: D000162:Acoustics / Q000295:instrumentation*; D017711:Nonlinear Dynamics; D013814:Thermal Conductivity