Critical dynamics in microgravity
Abstract
Although many well-controlled experiments have been conducted to measure the static properties of systems near criticality, few experiments have explored the transport properties in systems driven very far away from equilibrium as the transition occurs. Here we propose to measure the thermal gradient across the superfluid (HeII)-normal fluid (HeI) interface in microgravity conditions as a function of the heat flux Q used to make the measurements. Microgravity conditions are required (1) to avoid the hydrostatic pressure variation along the height of the helium column (a concern for Q<0.1 {mu}W {center_dot}cm {sup {minus}2}), (2) avoid convection in He-I for Q> 3 {mu}W {center_dot}cm{sup {minus}2} in our apparatus, and (3) to increase the Q=O interfacial width from its value of a few tens of microns on Earth to about a millimeter in orbit. New technologies described in this paper are under development for this experiment, which is in definition for Space Shuttle flight.
- Authors:
-
- Sandia National Laboratories, Albuquerque, NM (United States); and others
- Publication Date:
- Research Org.:
- Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
- OSTI Identifier:
- 471828
- DOE Contract Number:
- AC04-76DP00789
- Resource Type:
- Journal Article
- Journal Name:
- International Journal of Thermophysics
- Additional Journal Information:
- Journal Volume: 17; Journal Issue: 3; Other Information: PBD: May 1996
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 66 PHYSICS; 44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; HELIUM II; THERMAL CONDUCTIVITY; INTERFACES; MEASURING METHODS; HELIUM I; TEMPERATURE GRADIENTS; SUPERFLUIDITY; LAMBDA POINT; GRAVITATION; SUPERCONDUCTING DEVICES; PHASE TRANSFORMATIONS
Citation Formats
Duncan, R, Boyd, S, Akau, R, and Gianoulakis, S. Critical dynamics in microgravity. United States: N. p., 1996.
Web. doi:10.1007/BF01441509.
Duncan, R, Boyd, S, Akau, R, & Gianoulakis, S. Critical dynamics in microgravity. United States. https://doi.org/10.1007/BF01441509
Duncan, R, Boyd, S, Akau, R, and Gianoulakis, S. 1996.
"Critical dynamics in microgravity". United States. https://doi.org/10.1007/BF01441509.
@article{osti_471828,
title = {Critical dynamics in microgravity},
author = {Duncan, R and Boyd, S and Akau, R and Gianoulakis, S},
abstractNote = {Although many well-controlled experiments have been conducted to measure the static properties of systems near criticality, few experiments have explored the transport properties in systems driven very far away from equilibrium as the transition occurs. Here we propose to measure the thermal gradient across the superfluid (HeII)-normal fluid (HeI) interface in microgravity conditions as a function of the heat flux Q used to make the measurements. Microgravity conditions are required (1) to avoid the hydrostatic pressure variation along the height of the helium column (a concern for Q<0.1 {mu}W {center_dot}cm {sup {minus}2}), (2) avoid convection in He-I for Q> 3 {mu}W {center_dot}cm{sup {minus}2} in our apparatus, and (3) to increase the Q=O interfacial width from its value of a few tens of microns on Earth to about a millimeter in orbit. New technologies described in this paper are under development for this experiment, which is in definition for Space Shuttle flight.},
doi = {10.1007/BF01441509},
url = {https://www.osti.gov/biblio/471828},
journal = {International Journal of Thermophysics},
number = 3,
volume = 17,
place = {United States},
year = {Wed May 01 00:00:00 EDT 1996},
month = {Wed May 01 00:00:00 EDT 1996}
}