Numerical study of transient characteristics of a standing-wave thermoacoustic heat engine

Mohammad Jafari, Artur J. Jaworski, Antonio Piccolo, Kevin Simpson

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Understanding of transient fluid flow and heat transfer characteristics within thermoacoustic devices is crucial to improve their start up processes and subsequently the achievable efficiencies. The present numerical study investigates the transient features of a standing-wave quarter-wavelength thermoacoustic heat engine composed of hot and cold heat exchangers, a stack, and a resonator. The non-linear fluid dynamical as well as energy equations are solved on the structured grids by resolving viscous and thermal boundary layers using OpenFOAM software. Full discretization of governing equations captured nonlinear features of flow at high pressure amplitudes which are typically ignored by the linear theory. The results show the existence of acoustic streaming phenomenon in the system due to the interaction of Stokes boundary layer adjacent to the solid regions which can lead to undesirable convective heat transport and as a result the reduction of the system efficiency.

Original languageEnglish
Article number122530
Number of pages21
JournalInternational Journal of Heat and Mass Transfer
Volume186
Early online date10 Jan 2022
DOIs
Publication statusPublished - 1 May 2022

Fingerprint

Dive into the research topics of 'Numerical study of transient characteristics of a standing-wave thermoacoustic heat engine'. Together they form a unique fingerprint.

Cite this