Acoustic radiation force in a dual‐temperature resonant chamber

Abstract

The acoustic radiation force was measured for a dual‐temperature resonant chamber. This rectangular chamber has its long dimension approximately 8.5 times the square cross‐sectional dimension and the opposite ends are at widely different temperatures. Force profiles were obtained for two hot‐end temperatures of 500 °C and 750 °C, while the cool end remained at approximately room temperature. The lateral force was measured as a function of the long dimension of the chamber along the temperature gradient, and as a function of the drive voltage. The highest force per unit mass measured at 500 °C was 103.8 dyn/g for a frequency of 4450 Hz, and at 750 °C the highest force was 82.8 dyn/g for a frequency of 5500 Hz. Qualitatively, the measured force profiles correspond well with the theoretical curves; however, correlation of absolute magnitude is yet to be determined. [Work supported by NASA.]