Thermoacoustic heat transportation and energy transformation Part 2: Isothermal wall thermoacoustic effects

✍ Scribed by J.H. Xiao

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 564 KB
• Volume: 35
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(95)90420-k

✦ Synopsis

This paper discusses the acoustic wave motion and thermoacoustic effects in sound channels with isothermal walls. In this case, the main parameter governing the propagation of sound waves is the relative width. The key thermoacoustic effect is the mutual transformation of the longitudinal and the transverse heat fluxes. The main parameter governing the transformation is the acoustic admittance. A critical acoustic admittance exists for longitudinal heat flux. When the local acoustic admittance is greater than the critical value, the longitudinal heat flux increases; otherwise it decreases. A critical acoustic admittance for transverse heat flux also exists. When the local acoustic admittance is smaller than the critical value, heat is rejected to the environment; otherwise it is absorbed, if the Prandtl number of the gaseous medium is smaller than the critical Prandtl number. When the Prandtl number is larger than the critical Prandtl number, heat produced by dissipation dominates other effects, and heat absorption is replaced by the heat rejection effect.