Convective instability with time-varying rotation

Journal Article · Sun Dec 15 00:00:00 EST 1991 · Physical Review A. General Physics; (United States)

DOI:https://doi.org/10.1103/PhysRevA.44.8406· OSTI ID:5103414

Niemela, J J; Smith, M R; Donnelly, R J ^[1]

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1. Department of Physics, University of Oregon, Eugene, Oregon 97403 (United States)

We study experimentally the convective instability in a layer of helium I subject to a time-dependent rotation about a vertical axis {Omega}({ital t})={Omega}{sub {ital s}}+{Omega}{sub 0}cos({tilde {omega}}{ital t}). Relative stability of the conducting state is primarily determined by {tilde {omega}}, with the magnitude of shifts in the convective threshold at fixed {tilde {omega}} increasing with the modulation amplitude {Omega}{sub 0}/{Omega}{sub {ital s}}. Our observations are compared with recent theoretical work.

• OSTI ID: 5103414
• Journal Information: Physical Review A. General Physics; (United States), Vol. 44:12; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
HELIUM I
CONVECTIVE INSTABILITIES
AMPLITUDES
FREQUENCY DEPENDENCE
FREQUENCY MODULATION
LAYERS
NUSSELT NUMBER
ROTATION
VISCOSITY
EVEN-EVEN NUCLEI
HELIUM 4
HELIUM ISOTOPES
INSTABILITY
ISOTOPES
LIGHT NUCLEI
MODULATION
MOTION
NUCLEI
PLASMA INSTABILITY
STABLE ISOTOPES
665420* - Superfluidity- (1992-)