Nonlinear interactions in superfluid dynamics: nonstationary heat transfer due to second sound shock waves. Final report

Technical Report · Sat Jan 01 04:00:00 EST 1983

OSTI ID:5836644

Liepmann, H W; Torczynski, J R

Second sound techniques were used to study superfluid helium. Second sound shock waves produced relative velocities in the bulk fluid. Maximum counterflow velocities produced in this way are found to follow the Langer-Fischer prediction for the fundamental critical velocity in its functional dependence on temperature and pressure. Comparison of successive shock and rotating experiments provides strong evidence that breakdown results in vorticity production in the flow behind the shock. Schlieren pictures have verified the planar nature of second sound shocks even after multiple reflections. The nonlinear theory of second sound was repeatedly verified in its prediction of double shocks and other nonlinear phenomena.

• Research Organization: California Inst. of Tech., Pasadena (USA)
• OSTI ID: 5836644
• Report Number(s): N-8319017; NASA-CR-169934
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRITICAL VELOCITY
ELEMENTS
ENERGY TRANSFER
FLUIDS
GASES
HEAT TRANSFER
HELIUM
NONLINEAR PROBLEMS
NONMETALS
PHOTOGRAPHY
PRESSURE DEPENDENCE
RARE GASES
SCHLIEREN METHOD
SECOND SOUND
SHOCK WAVES
SOUND WAVES
SUPERFLUIDITY
TEMPERATURE DEPENDENCE
VELOCITY
VORTICES