Heat transfer enhancement on thin wires in superfluid helium forced flows
Abstract
In this paper, we report the first evidence of an enhancement of the heat transfer from a heated wire by an external turbulent flow of superfluid helium. We used a standard Pt-Rh hot-wire anemometer and overheat it up to 21 K in a pressurized liquid helium turbulent round jet at temperatures between 1.9 K and 2.12 K. The null-velocity response of the sensor can be satisfactorily modeled by the counter flow mechanism while the extra cooling produced by the forced convection is found to scale similarly as the corresponding extra cooling in classical fluids. We propose a preliminary analysis of the response of the sensor and show that -contrary to a common assumption- such sensor can be used to probe local velocity in turbulent superfluid helium.
Keywords
Cite
@article{arxiv.1410.0167,
title = {Heat transfer enhancement on thin wires in superfluid helium forced flows},
author = {Davide Duri and Christophe Baudet and Jean-Paul Moro and Philippe-Emmanuel Roche and Pantxo Diribarne},
journal= {arXiv preprint arXiv:1410.0167},
year = {2014}
}
Comments
9 pages, 4 figures