Hot wire anemometer for cryogenic helium turbulent flows and study of the intermittency EuHIT Funded Project

Team

Alain Girard
CEA, Grenoble, France

Overview

Research Infrastructure
CEA Grenoble Helium Infrastructures, France
Facilities used
HeJet (HeJet)
Project leader
Olivier Pirotte
Cern, Geneva, Switzerland

Abstract

Hot wire anemometry needs to be adapted to cryogenic flows, as the resistance of the hot wire is strongly dependent on the temperature. At cryogenic temperatures, commercially available hot wire anemometers are no longer appropriate, as mechanical constraints induced by the cryogenic temperatures make them fragile. Moreover, the resistance range should be adapted. At CERN, we wish to consider the use of Wollaston hot wires (Pt90 Rh10) of small radius (less than one micrometer and lower aspect ratio – in the range L/d 80-100) in order to study later the inertial range close to the dissipative scales in GReC, and the role of intermittency. In the present experiments we plan to develop and to test Wollastone hot wires in the HeJet facility at CEA Grenoble, which is able to provide a high turbulence rate that is relevant for GReC operating conditions. We wish to explore the robustness and the operation of this kind of anemometers in a range of Reynolds as wide as possible. We also wish to examine the behavior of this anemometer in superfluid helium.