LDV measurements of Rayleigh streaming in channels of rectangular cross-section

• Published in: AIP conference proceedings Vol. 1685; no. 1
• Main Authors: Bessis, R, Bailliet, H, Reyt, I, J-Ch, Valière
• Format: Conference Proceeding
• Language: English
• Published: Melville American Institute of Physics 28.10.2015
• Subjects: Aspect ratio; Channels; Enclosures; Two dimensional models
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/1.4934435

Rayleigh streaming, suspected to hamper the efficiency of thermoacoustic engines, has been the subject of numerous theoretical and experimental studies in the last decades. This phenomenon is well characterized in the case of two-dimensional channels, but streaming in three-dimensional enclosures, such as rectangular channels, is a usually described using a two-dimensional theoretical model, although such predictions have rarely been confronted to measurements. We present results of LDV measurements in rectangular channels with different aspect ratios. The axial particle velocity is estimated from velocity measurements and axial acoustic and streaming velocity evolutions along transverse axes are considered. Results for different channel heights are used to discuss the limit of validity of the usual 2D channel hypothesis when considering a rectangular enclosure.