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Title: Heat-exchanger concepts for neutral-beam calorimeters

Abstract

Advanced cooling concepts that permit the design of water cooled heat exchangers for use as calorimeters and beam dumps for advanced neutral beam injection systems were evaluated. Water cooling techniques ranging from pool boiling to high pressure, high velocity swirl flow were considered. Preliminary performance tests were carried out with copper, inconel and molybdenum tubes ranging in size from 0.19 to 0.50 in. diameter. Coolant flow configurations included (1) smooth tube/straight flow, (2) smooth tube with swirl flow created by tangential injection of the coolant, and (3) axial flow in internally finned tubes. Additionally, the effect of tube L/D was evaluated. A CO/sub 2/ laser was employed to irradiate a sector of the tube exterior wall; the laser power was incrementally increased until burnout (as evidenced by a coolant leak) occurred. Absorbed heat fluxes were calculated by dividing the measured coolant heat load by the area of the burn spot on the tube surface. Two six element thermopiles were used to accurately determine the coolant temperature rise. A maximum burnout heat flux near 14 kW/cm/sup 2/ was obtained for the molybdenum tube swirl flow configuration.

Authors:
; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (USA)
OSTI Identifier:
6130106
Report Number(s):
UCRL-85948; CONF-811040-108
ON: DE82003126; TRN: 82-001556
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: 9. symposium on engineering problems of fusion research, Chicago, IL, USA, 26 Oct 1981
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CALORIMETERS; HEAT EXCHANGERS; PERFORMANCE TESTING; NEUTRAL BEAM SOURCES; BOILING; COOLING; TUBES; MEASURING INSTRUMENTS; PHASE TRANSFORMATIONS; TESTING; 700209* - Fusion Power Plant Technology- Component Development & Materials Testing; 700205 - Fusion Power Plant Technology- Fuel, Heating, & Injection Systems

Citation Formats

Thompson, C C, Polk, D H, McFarlin, D J, and Stone, R. Heat-exchanger concepts for neutral-beam calorimeters. United States: N. p., 1981. Web.
Thompson, C C, Polk, D H, McFarlin, D J, & Stone, R. Heat-exchanger concepts for neutral-beam calorimeters. United States.
Thompson, C C, Polk, D H, McFarlin, D J, and Stone, R. 1981. "Heat-exchanger concepts for neutral-beam calorimeters". United States. https://www.osti.gov/servlets/purl/6130106.
@article{osti_6130106,
title = {Heat-exchanger concepts for neutral-beam calorimeters},
author = {Thompson, C C and Polk, D H and McFarlin, D J and Stone, R},
abstractNote = {Advanced cooling concepts that permit the design of water cooled heat exchangers for use as calorimeters and beam dumps for advanced neutral beam injection systems were evaluated. Water cooling techniques ranging from pool boiling to high pressure, high velocity swirl flow were considered. Preliminary performance tests were carried out with copper, inconel and molybdenum tubes ranging in size from 0.19 to 0.50 in. diameter. Coolant flow configurations included (1) smooth tube/straight flow, (2) smooth tube with swirl flow created by tangential injection of the coolant, and (3) axial flow in internally finned tubes. Additionally, the effect of tube L/D was evaluated. A CO/sub 2/ laser was employed to irradiate a sector of the tube exterior wall; the laser power was incrementally increased until burnout (as evidenced by a coolant leak) occurred. Absorbed heat fluxes were calculated by dividing the measured coolant heat load by the area of the burn spot on the tube surface. Two six element thermopiles were used to accurately determine the coolant temperature rise. A maximum burnout heat flux near 14 kW/cm/sup 2/ was obtained for the molybdenum tube swirl flow configuration.},
doi = {},
url = {https://www.osti.gov/biblio/6130106}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Oct 05 00:00:00 EDT 1981},
month = {Mon Oct 05 00:00:00 EDT 1981}
}

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