Conveners
C3OrJ - Special Session: Helium II Properties and Systems
- Nandhini Dhanaraj (Fermi National Accelerator Laboratory)
- Franklin Miller (University of Wisconsin - Madison)
290.
[Invited] Heat transfer during bubble shrinking in saturated He II under microgravity condition
Suguru Takada
(National Institute for Fusion Science)
01/07/2015, 16:15
CEC-13 - Helium II Properties and Systems
Invited Oral Presentation
Microgravity experiments of He II boiling using a drop tower were carried out. The small cryostat equipped with optical windows and whole the equipment was dropped more than 100 times. Time duration of microgravity environment less than 1 m-g is about 1.2 sec. The process of bubble shrinking in He II in microgravity was observed by a high speed camera with a telecentric lens under the...
Torsten Koettig
(CERN)
01/07/2015, 16:45
CEC-13 - Helium II Properties and Systems
Invited Oral Presentation
Oscillating Superleak Transducers (OSTs) can be used to localize quenches in superconducting radio-frequency cavities. Local hot spots at the cavity surface initiate temperature waves in the surrounding superfluid helium that acts as cooling fluid at typical temperatures in the range of 1.6 K to 2 K. The temperature wave is characterised by the properties of superfluid helium as the second...
Prof.
Masahide Murakami
(University of Tsukuba)
01/07/2015, 17:15
CEC-12 - Fluid Mechanics, Heat Transfer, and Cryogen Properties
Contributed Oral Presentation
Boiling phenomena in He II were studied on the basis of the flow velocity field derived from flow field visualization and a PIV (Particle Image Velocimetry) measurement. Noisy and silent film boiling modes together with non-boiling state were generated on/around a horizontal planar and a cylindrical heaters. For PIV tracer particles, H2-D2 micro solid particles that were neutrally buoyant in...
romain bruce
(CEA Saclay)
01/07/2015, 17:30
CEC-13 - Helium II Properties and Systems
Contributed Oral Presentation
The cryogenic design of the next generation of superconducting accelerator magnets depends on our ability to simulate the helium heat and mass transfer in the internal structure of these magnets. For that matter accurate tools must be developed such as numerical codes integrating the thermodynamic behavior and phase transition in superfluid helium. Moreover it would also help to understand the...
