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Title: Initial LM-MHD thin film flow experiments in the MeGA-loop facility at UCLA

Abstract

The use of liquid metal (LM) as either a coolant, breeder or plasma contact surfaces in tokamaks requires the study of the moving conducting metal in the strong magnetic fields associated with magnetic plasma confinement. In order to study in more depth this particular class of fusion problems, a LM flow loop coupled to a magnetic field system has been constructed at UCLA. This loop circulates a Bismuth-Lead quintary eutectic as its working metal through a large test volume in the center of a solenoidal resistive magnet set. In particular this facility has a relatively long length parallel to the magnetic field and perpendicular to the acceleration of gravity. As a first experiment in MeGA, a thin film flow test section has been constructed and installed in the flow loop and measurements of the evolving film height and electric potential were taken at a variety of positions along the length and width of the flow as a function of the flow rate, chute angle to gravity and inlet film height. Initial results show little effect of the field on the wide, thin flows typical of those required for fusion divertor protection. This is not typical of roughly square shaped ductsmore » of similar size, and is attributed to the long current path lengths relative to the length over which the v x B electromotive force acts. A comparison of this data with simple analytical models is also given in order to estimate the accuracy of these simple predictive methods. Suggestions for future experiments in this area, as well as planned facility upgrades are discussed.« less

Authors:
; ;  [1]
  1. Univ. of California, Los Angeles, CA (United States) [and others
Publication Date:
OSTI Identifier:
196885
Report Number(s):
CONF-940664-
TRN: 95:005767-0054
Resource Type:
Conference
Resource Relation:
Conference: ISFNT-3: international symposium on fusion nuclear technology, Los Angeles, CA (United States), 27 Jun - 1 Jul 1994; Other Information: PBD: 1994; Related Information: Is Part Of Third international symposium on fusion nuclear technology; PB: 362 p.
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; 66 PHYSICS; LIQUID METALS; FLUID FLOW; MAGNETOHYDRODYNAMICS; THIN FILMS; MAGNETIC FIELDS; BISMUTH; LEAD; EUTECTICS

Citation Formats

Morley, N.B., Gaizer, A., and Tillack, M.S.. Initial LM-MHD thin film flow experiments in the MeGA-loop facility at UCLA. United States: N. p., 1994. Web.
Morley, N.B., Gaizer, A., & Tillack, M.S.. Initial LM-MHD thin film flow experiments in the MeGA-loop facility at UCLA. United States.
Morley, N.B., Gaizer, A., and Tillack, M.S.. Sat . "Initial LM-MHD thin film flow experiments in the MeGA-loop facility at UCLA". United States.
@article{osti_196885,
title = {Initial LM-MHD thin film flow experiments in the MeGA-loop facility at UCLA},
author = {Morley, N.B. and Gaizer, A. and Tillack, M.S.},
abstractNote = {The use of liquid metal (LM) as either a coolant, breeder or plasma contact surfaces in tokamaks requires the study of the moving conducting metal in the strong magnetic fields associated with magnetic plasma confinement. In order to study in more depth this particular class of fusion problems, a LM flow loop coupled to a magnetic field system has been constructed at UCLA. This loop circulates a Bismuth-Lead quintary eutectic as its working metal through a large test volume in the center of a solenoidal resistive magnet set. In particular this facility has a relatively long length parallel to the magnetic field and perpendicular to the acceleration of gravity. As a first experiment in MeGA, a thin film flow test section has been constructed and installed in the flow loop and measurements of the evolving film height and electric potential were taken at a variety of positions along the length and width of the flow as a function of the flow rate, chute angle to gravity and inlet film height. Initial results show little effect of the field on the wide, thin flows typical of those required for fusion divertor protection. This is not typical of roughly square shaped ducts of similar size, and is attributed to the long current path lengths relative to the length over which the v x B electromotive force acts. A comparison of this data with simple analytical models is also given in order to estimate the accuracy of these simple predictive methods. Suggestions for future experiments in this area, as well as planned facility upgrades are discussed.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Dec 31 00:00:00 EST 1994},
month = {Sat Dec 31 00:00:00 EST 1994}
}

Conference:
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