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Quantum turbulence
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==== Detection in helium II ==== * Measuring the attenuation of second sound waves * Measuring temperature or pressure gradients <ref>{{Cite journal|last1=Walstrom|first1=P. L.|last2=Weisend II|first2=J. G.|last3=Maddocks|first3=J. R.|last4=Van Sciver|first4=S. W.|date=1988-02-01|title=Turbulent flow pressure drop in various He II transfer system components|url=https://www.sciencedirect.com/science/article/abs/pii/0011227588900549|journal=Cryogenics|language=en|volume=28|issue=2|pages=101β109|doi=10.1016/0011-2275(88)90054-9|bibcode=1988Cryo...28..101W |issn=0011-2275}}</ref> * Measuring ions trapped in the vortices<ref>{{Cite journal|last1=Milliken|first1=F. P.|last2=Schwarz|first2=K. W.|last3=Smith|first3=C. W.|date=1982-04-26|title=Free Decay of Superfluid Turbulence|url=https://link.aps.org/doi/10.1103/PhysRevLett.48.1204|journal=Physical Review Letters|volume=48|issue=17|pages=1204β1207|doi=10.1103/PhysRevLett.48.1204|bibcode=1982PhRvL..48.1204M }}</ref> * Using tracer particles (small glass or plastic spheres/solid hydrogen snowballs) of size of the order of a micron, and then imaging them using lasers. Techniques that can be used are PIV (particle image velocimetry) or PTV (particle tracking velocimetry). Most recently, excimer helium molecules have been used <ref>{{Cite journal|last1=Bewley|first1=G. P.|last2=Lathrop|first2=D. P.|last3=Sreenivasan|first3=K. R.|date=June 2006|title=Visualization of quantized vortices|journal=Nature|language=en|volume=441|issue=7093|pages=588|doi=10.1038/441588a|pmid=16738652|bibcode=2006Natur.441..588B |issn=1476-4687|doi-access=free}}</ref><ref>{{Cite journal|last1=Chagovets|first1=T. V.|last2=Van Sciver|first2=S. W.|date=2011-10-01|title=A study of thermal counterflow using particle tracking velocimetry|url=https://aip.scitation.org/doi/10.1063/1.3657084|journal=Physics of Fluids|volume=23|issue=10|pages=107102β107102β5|doi=10.1063/1.3657084|bibcode=2011PhFl...23j7102C |issn=1070-6631}}</ref><ref>{{Cite journal|last1=Mantia|first1=M. La|last2=Duda|first2=D.|last3=Rotter|first3=M.|last4=Skrbek|first4=L.|date=February 2013|title=Lagrangian accelerations of particles in superfluid turbulence|url=https://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/abs/lagrangian-accelerations-of-particles-in-superfluid-turbulence/DC096198052DFC55296AE510CB074C50|journal=Journal of Fluid Mechanics|language=en|volume=717|doi=10.1017/jfm.2013.31|bibcode=2013JFM...717R...9L |s2cid=123402428|issn=0022-1120}}</ref> * Using oscillating forks <ref name=":1" /> * Using cantilevers <ref>{{Cite journal|last1=Salort|first1=J.|last2=Monfardini|first2=A.|last3=Roche|first3=P.-E.|date=2012-12-01|title=Cantilever anemometer based on a superconducting micro-resonator: Application to superfluid turbulence|url=https://aip.scitation.org/doi/10.1063/1.4770119|journal=Review of Scientific Instruments|volume=83|issue=12|pages=125002β125002β6|doi=10.1063/1.4770119|pmid=23278018|bibcode=2012RScI...83l5002S |issn=0034-6748}}</ref> * Using cryogenic hot wires <ref>{{Cite journal|last1=Diribarne|first1=P.|last2=Thibault|first2=P.|last3=Roche|first3=P.|date=2019-10-01|title=Nano-shaped hot-wire for ultra-high resolution anemometry in cryogenic helium|url=https://aip.scitation.org/doi/10.1063/1.5116852|journal=Review of Scientific Instruments|volume=90|issue=10|pages=105004|doi=10.1063/1.5116852|bibcode=2019RScI...90j5004D |s2cid=209972973 |issn=0034-6748}}</ref>
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