Experiment attributes to establish tube with twisted tape insert performance cooling plasma facing components

• Published in: Fusion engineering and design Vol. 100; no. C; pp. 541 - 549
• Main Authors: Clark, E., Griffard, C., Ramirez, E., Ruggles, A.
• Format: Journal Article
• Language: English
• Published: United States Elsevier B.V 01.11.2015; Elsevier
• Subjects: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Burn out; Computational fluid dynamics; Confinement; Cooling; Critical heat flux; Design engineering; Flow excursion; Fluid flow; Fluids; Inserts; Monoblock; Pressure drop oscillation; Swirl flow; Tubes; Swirl flow; Burn out; Flow excursion; Pressure drop oscillation; Critical heat flux; Monoblock
• ISSN: 0920-3796; 1873-7196
• DOI: 10.1016/j.fusengdes.2015.08.004

•Overview of twisted tape tube inserts for plasma facing components.•Reviews historical twisted tape burn out heat flux experiments and models.•Presents burn out heat flux model with radial pressure gradient from flow rotation.•Compares burn out, net vapor generation, and flow excursion models for twisted tapes.•Identifies twisted tape knowledge gaps in plasma facing applications from literature. The modeling capability for tubes with twisted tape inserts is reviewed with reference to the application of cooling plasma facing components in magnetic confinement fusion devices. The history of experiments examining the cooling performance of tubes with twisted tape inserts is reviewed with emphasis on the manner of heating, flow stability limits and the details of the test section and fluid delivery system. Models for heat transfer, burnout, and onset of net vapor generation in straight tube flows and tube with twisted tape are compared. The gaps in knowledge required to establish performance limits of the plasma facing components are identified and attributes of an experiment to close those gaps are presented.