A Study on the Roton-limited Thermal Boundary Shock Wave in Liquid Helium Films
Chul-Won Jun ∗
School of Mechanical Engineering, Kyungnam University, Changwon 631-701, Korea (Received 20 May 2013 : revised 7 June 2013 : accepted 15 July 2013)
The thickness of the roton-limited thermal boundary shock wave in liquid helium films is obtained as a function of temperature by solving the two-fluid hydrodynamic equations including dissipation coefficients. The roton-limited temperature region in liquid helium films with a particle density of 0.0279 ˚ A
−2is about 0.8 K < T < 1.2 K. In this temperature region, phonon-roton transformation processes and roton-roton scattering processes play the main roles in investigating the temperature variations of the dissipation coefficients. Based on these interactions, the thickness of the thermal boundary shock wave depends on the thermal conductivity, the first viscosity, and the second viscosity, and decreases with increasing temperature. The pressure is also shown to be high on the side of the boundary where the temperature is high while the normal fluid velocity is low on that side.
PACS numbers: 67.40.Pm
Keywords: Thermal boundary shock wave, Two-fluid hydrodynamic equations, Phonon-roton transformation processes, Roton-roton scattering processes
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PACS numbers: 67.40.Pm
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