12,000

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

93%

93% of Lancaster students go into work or further study within six months of graduating

Home > Research > Publications & Outputs > Crossover from hydrodynamic to acoustic drag on...
View graph of relations

« Back

Crossover from hydrodynamic to acoustic drag on quartz tuning forks in normal and superfluid 4He

Research output: Contribution to journalJournal article

Published

???articleNumber???014501
Journal publication date6/01/2012
JournalPhysical Review B
Journal number1
Volume85
Number of pages9
Pages-
Original languageEnglish

Abstract

We present measurements of the drag forces on quartz tuning forks oscillating at low velocities in normal and superfluid 4He. We have investigated the dissipative drag over a wide range of frequencies, from 6.5 to 600 kHz, by using arrays of forks with varying prong lengths and by exciting the forks in their fundamental and first overtone modes. At low frequencies the behavior is dominated by laminar hydrodynamic drag, governed by the fluid viscosity. At higher frequencies acoustic drag is dominant and is described well by a three-dimensional model of sound emission.

Bibliographic note

©2012 American Physical Society