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Creating Turbulence in a Dissipationless Fluid Gary G. Ihas, University of Florida, DMR 0602778

Creating Turbulence in a Dissipationless Fluid Gary G. Ihas, University of Florida, DMR 0602778.

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Creating Turbulence in a Dissipationless Fluid Gary G. Ihas, University of Florida, DMR 0602778

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  1. Creating Turbulence in a Dissipationless FluidGary G. Ihas, University of Florida, DMR 0602778 If we pull a wire mesh through a fluid with zero viscosity, we might think that there will be no drag force and that the fluid will smoothly flow around the wires of the mesh, creating no turbulence. Yet, turbulence of sorts has been observed in liquid helium near absolute zero, which has vanishingly small viscosity. Once this turbulence is created, it seems that there is no mechanism except through viscosity for it to decay. Yet again, it does decay. Until now, no one had succeeded in producing isotropic homogeneous turbulence, as is often studied in classical fluids, in a dissapationless fluid. We have designed, built, and operated the superconducting pulsed actuator (shown schematically at right), which, when mounted on a dilution refrigerator, allows exactly such studies to be achieved. • Schematic of Cell • Pb plated Cu cell • Phenolic armature • Superconducting • solenoid • Superconducting • Nb can (2) • Capacitive • position sensor • Mesh grid • 300 µm thermistors • Resistive heater

  2. Creating Turbulence in a Dissipationless FluidGary G. Ihas (University of Florida)DMR 0602778 Above: Florida Quantum Turbulence Workshop participants, including Shu-chen Liu (Second woman from left), who earned her Ph.D. under Ihas, now post doctoral associate at the Korea Advanced Institute of Science and Technology. Current group graduate student Kyle Thompson is back row, third from right. Unfortunately, our collaborators from England, W.F. Vinen and Peter McClintock could not attend because of illnesses. Ihas is front row center. Left: REU student Jonathan Griffin (Morehouse University) spent the summer studying thermometric materials with low magneto-resistances. A mini-symposium (organized by Ihas) at the American Physical Society’s Division of Fluid Dynamics meeting (Chaired by University of Florida) introduced the classical fluid mechanics world to quantum turbulence. Ihas organized a tutorial at the March Meeting of the American Physical Society on Cryogenic Fluid Dynamics.

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