DSM : Thesis SL-DSM-14-0031

PDF
Français


 

Research field

Thermal energy, combustion, flows / Engineering science

Title

Study of heat transfer in superfluid helium in micro-channels

Abstract

For superconducting accelerator magnets cooled by superfluid helium (T<2.2 K) the electrical insulation is the largest thermal barrier against cooling. These insulations are composed of wrapping creating micro-channels with dimensions on the order of 10 to 100 microns. Understanding the thermal phenomena at this level of confinement is necessary for the design of the cooling system of these magnets. The "bulk" thermal properties of the superfluid helium remain valid for dimensions of the order of hundred microns, but for higher confinement, the validity of the transport laws is still unproven. We propose to study experimentally the heat transfer in superfluid helium in tubes, alone or networked, with hydraulic diameters ranging from 50 microns to several microns. The studies will be undertaken in "pure" superfluid regime (Landau regime) and superfluid turbulence (Gorter-Mellink regime). These experimental measurements will be coupled to a direct numerical simulation using the two-fluid model of Landau (NS equations change.) An existing 2D code will have to be improved to simulate the two temperature regimes of superfluid helium.

Location

Institut de recherche sur les lois fondamentales de l'univers
Service des Accélérateurs, de Cryogénie et de Magnétisme
Laboratoire Cryogénie et Stations d'Essais
Centre : Saclay
Starting date : 01/10/2014

Contact person

Bertrand BAUDOUY
CEA / DSM/IRFU/SACM/LCSE
CEA Saclay

DSM/Irfu/SACM

Bâtiment 123

91191 Gif-sur-Yvette
Phone : 01 69 08 42 07

More about

http://irfu.cea.fr/Sacm/index.php

University / Graduate School

Paris Sud
Modélisation et Instrumentation en Physique, Energie, Géosciences et Environnement (MIPEGE) - Paris XI -

Thesis supervisor

Chantal MEURIS
CEA / DSM/Irfu/SACM
Irfu/SACM

CEA/Saclay

91191 Gif-sur-Yvette Cedex


INSTN - Website
Updated on 07/30/2014
© CEA 2014 - All rights reserved
Legal information