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Title: Comparison between Normal and HeII Two-phase Flows at High Vapor Velocities

Abstract

We present results on helium co-current two-phase flow experiments at high vapor velocity obtained with the use of the new CEA/SBT 400 W/1.8 K refrigerator. For vapor velocities larger than typically 4 m/s, a mist of droplets develops from the bulk liquid interface accompanied by an increase in heat transfer at the wall. Experiments were conducted in a 10 m long, 40 mm I.D. straight pipe, both in helium II and in helium I to compare these two situations. The respective roles of vapor density, vapor velocity and liquid level on atomization were systematically investigated. Light scattering experiments were performed to measure sizes, velocities and interfacial areas of droplets in a complete cross section. In-house-made heat transfer sensors located in the mist allowed us to deduce an upper value of the extra cooling power of the dispersed phase. The practical interest of atomized flow for cooling large cryogenic facilities is discussed by considering the balance between increase in heat transfer and pressure drops it induces.

Authors:
 [1];  [2];  [1]; ;  [3];  [4]
  1. DRFMC/SBT/CEAG, Grenoble, 38054 (France)
  2. (France)
  3. CRTBT/CNRS, Grenoble, 38042 (France)
  4. CERN, European Organization for Nuclear Research, AT/CR, CH-1211, Geneva, 23 (Switzerland)
Publication Date:
OSTI Identifier:
20800208
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 823; Journal Issue: 1; Conference: Cryogenic engineering conference, Keystone, CO (United States), 29 Aug - 2 Sep 2005; Other Information: DOI: 10.1063/1.2202593; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ATOMIZATION; COMPARATIVE EVALUATIONS; CROSS SECTIONS; DENSITY; DROPLETS; HEAT TRANSFER; HELIUM I; HELIUM II; INTERFACES; LIGHT SCATTERING; LIQUIDS; PRESSURE DROP; REFRIGERATION; REFRIGERATORS; SUPERFLUIDITY; TWO-PHASE FLOW; VAPORS; VELOCITY

Citation Formats

Perraud, S., CRTBT/CNRS, Grenoble, 38042, Rousset, B., Thibault, P., Wolf, P. E., and Weelderen, R. van. Comparison between Normal and HeII Two-phase Flows at High Vapor Velocities. United States: N. p., 2006. Web. doi:10.1063/1.2202593.
Perraud, S., CRTBT/CNRS, Grenoble, 38042, Rousset, B., Thibault, P., Wolf, P. E., & Weelderen, R. van. Comparison between Normal and HeII Two-phase Flows at High Vapor Velocities. United States. doi:10.1063/1.2202593.
Perraud, S., CRTBT/CNRS, Grenoble, 38042, Rousset, B., Thibault, P., Wolf, P. E., and Weelderen, R. van. Thu . "Comparison between Normal and HeII Two-phase Flows at High Vapor Velocities". United States. doi:10.1063/1.2202593.
@article{osti_20800208,
title = {Comparison between Normal and HeII Two-phase Flows at High Vapor Velocities},
author = {Perraud, S. and CRTBT/CNRS, Grenoble, 38042 and Rousset, B. and Thibault, P. and Wolf, P. E. and Weelderen, R. van},
abstractNote = {We present results on helium co-current two-phase flow experiments at high vapor velocity obtained with the use of the new CEA/SBT 400 W/1.8 K refrigerator. For vapor velocities larger than typically 4 m/s, a mist of droplets develops from the bulk liquid interface accompanied by an increase in heat transfer at the wall. Experiments were conducted in a 10 m long, 40 mm I.D. straight pipe, both in helium II and in helium I to compare these two situations. The respective roles of vapor density, vapor velocity and liquid level on atomization were systematically investigated. Light scattering experiments were performed to measure sizes, velocities and interfacial areas of droplets in a complete cross section. In-house-made heat transfer sensors located in the mist allowed us to deduce an upper value of the extra cooling power of the dispersed phase. The practical interest of atomized flow for cooling large cryogenic facilities is discussed by considering the balance between increase in heat transfer and pressure drops it induces.},
doi = {10.1063/1.2202593},
journal = {AIP Conference Proceedings},
number = 1,
volume = 823,
place = {United States},
year = {Thu Apr 27 00:00:00 EDT 2006},
month = {Thu Apr 27 00:00:00 EDT 2006}
}