Hydrodynamics of superfluid helium below 0.6 $sup 0$K. II. Velocity and attenuation of ultrasonic waves

Journal Article · Thu Nov 01 04:00:00 EST 1973 · Phys. Rev., A, v. 8, no. 5, pp. 2629-2639

OSTI ID:4339688

Maris, H J

The attenuation and velocity of an ultrasonic wave in superfluid helium- 4 have been calculated for temperatures below 0.6 deg K. The calculation is based on the kinetic equations given by Khalatnikov. The phonon Boltzmann equation is solved numerically without making simplifying approximations about the form of the collision integral. The theory predicts that the velocity of sound increseses with frequency for very low frequencies, passes through a maximum, decreases to a minimum, and finally incresses towards a constant value at high frequencies. A simple explanation for this peculiar behavior is given. The theory is in good agreement with the experimental results of Abrashams et al., and Waters et al. (auth)

• Research Organization: Department of Physics, Brown University, Providence, Rhode Island 02912
• NSA Number: NSA-29-022721
• OSTI ID: 4339688
• Journal Information: Phys. Rev., A, v. 8, no. 5, pp. 2629-2639, Journal Name: Phys. Rev., A, v. 8, no. 5, pp. 2629-2639; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

*HELIUM II-- ULTRASONIC WAVES
ATTENUATION
KHALATNIKOV THEORY
N66100* --Physics (Low Temperature)--Superfluidity
ULTRALOW TEMPERATURE
VELOCITY