We have over 12,000 students, from over 100 countries, within one of the safest campuses in the UK


97% of Lancaster students go into work or further study within six months of graduating

Home > Research > Publications & Outputs > Direct measurement of the energy dissipated by ...
View graph of relations

« Back

Direct measurement of the energy dissipated by quantum turbulence

Research output: Contribution to journalJournal article


<mark>Journal publication date</mark>06/2011
<mark>Journal</mark>Nature Physics
Number of pages0
<mark>Original language</mark>English


The lack of a general solution to the governing Navier-Stokes equations means that there is no fundamental theory of turbulence. In the simpler case of pure quantum turbulence, the tangle of identical singly quantized vortices in superfluids at T similar to O may provide a deeper understanding of turbulence in general. The well-known Kolmogorov theory(1) predicts the energy distribution of turbulence and how it decays. In normal systems the turbulent energy is generally only a small perturbation on the total thermal energy of the supporting medium. In quantum turbulence, however, the energy is accessible. A stationary condensate is necessarily in its ground state with zero enthalpy. Thus quantum turbulence accounts for the entire free energy of the superfluid and there are no other contributions. Here, we exploit this property to make the first direct measurement of the energy released by freely decaying quantum turbulence. Our results are consistent with a Kolmogorov energy spectrum with an inferred Kolmogorov constant remarkably similar to those of classical fluids.