Vortex Shedding from an Object Moving in Superfluid $$^4\hbox {He}$$ 4 He at mK Temperatures and in a Bose–Einstein Condensate
| Autor: | Wilfried Schoepe |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Physics
Condensed Matter::Other Turbulence Oscillation Quantum turbulence Condensed Matter Physics Critical ionization velocity Vortex shedding 01 natural sciences Omega Atomic and Molecular Physics and Optics 010305 fluids & plasmas law.invention Superfluidity law Quantum mechanics 0103 physical sciences General Materials Science 010306 general physics Bose–Einstein condensate |
| Zdroj: | Journal of Low Temperature Physics. 186:121-126 |
| ISSN: | 1573-7357 0022-2291 |
| DOI: | 10.1007/s10909-016-1653-2 |
| Popis: | Vortex shedding from a microsphere oscillating in superfluid $$^4\hbox {He}$$ at mK temperatures is compared with that from a laser beam moving in a Bose–Einstein condensate as observed by other authors. In particular, in either case a linear dependence of the shedding frequency $$f_v$$ on $$\varDelta v = v - v_c$$ is observed, where v is the velocity amplitude of the sphere or the constant velocity of the laser beam above a critical velocity $$v_c$$ for the onset of turbulent flow: $$f_v = a \,\varDelta v$$ , where the coefficient a is proportional to the oscillation frequency $$ \omega $$ above some characteristic frequency $$\omega _k$$ and assumes a finite value for steady motion $$\omega \rightarrow 0$$ . |
| Databáze: | OpenAIRE |
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