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Experimental and numerical studies of helium-cooled modular divertors with multiple jets

Journal Article · · Fusion Engineering and Design
 [1];  [2];  [2];  [2]
  1. Georgia Institute of Technology, Atlanta, GA (United States); DOE/OSTI
  2. Georgia Institute of Technology, Atlanta, GA (United States)
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As part of the US-Japan PHENIX program, the helium-cooled modular divertor with multiple jets (HEMJ) and a simpler “flat” variant were experimentally studied in a closed helium loop with a redesigned test chamber at coolant inlet temperatures as great as 425 °C, incident heat fluxes as great as 2.2 MW/m2 and prototypical inlet pressures of ~10 MPa. The data were used to develop correlations for the average Nusselt number and loss coefficient for a range of mass flow rates; these correlations were used in turn to predict the thermal-hydraulic performance of a single divertor module at prototypical conditions. The experimental results suggest that a flat jet array with six holes surrounding one central hole, all of the same diameter, can provide similar average heat transfer coefficients as the HEMJ divertor, albeit with higher pumping power requirements. Because of its smaller cooled surface area, however, this design has lower maximum allowable heat fluxes compared with the HEMJ divertor. Nevertheless, the flat variant could potentially simplify manufacturing and reduce the costs required to fabricate O(106) “finger” modules.

Research Organization:
Georgia Inst. of Technology, Atlanta, GA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
FG02-01ER54656
OSTI ID:
1609371
Alternate ID(s):
OSTI ID: 22850252
Journal Information:
Fusion Engineering and Design, Journal Name: Fusion Engineering and Design Journal Issue: A Vol. 136; ISSN 0920-3796
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (5)

He-cooled divertor development for DEMO journal October 2007
He-cooled divertor for DEMO: Status of development and HHF tests journal December 2010
Verification of Thermal Performance Predictions of Prototypical Multi-Jet Impingement Helium-Cooled Divertor Module journal August 2013
Experimental Evaluation of the Thermal Hydraulics of Helium-Cooled Divertors journal January 2015
An Experimental Study of the Helium-Cooled Modular Divertor with Multiple Jets at Nearly Prototypical Conditions journal October 2015

Cited By (1)

Thermal Hydraulics of Helium-Cooled Finger-Type Divertors at Higher Incident Heat Fluxes journal May 2019

Figures / Tables (10)

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Fig. 10(p. 6)figure Fig. 10

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY