Journal article
DIAGNOSTIC TWIN SCREW EXTRUDER: INITIAL MEASUREMENTS OF CONTINUOUS Ne, H-2, AND D-2 EXTRUSIONS
FUSION SCIENCE AND TECHNOLOGY, Vol.68(2), pp.388-391
2015
Handle:
https://hdl.handle.net/2376/118455
Abstract
Flow and heat transfer measurements of solid hydrogenic materials inside twin screw extruders are not available. Fusion tokamaks like ITER require fuel pellet injection at 99.9% reliability which requires validated twin screw extruder throughput models for operation. The throughput of an extruder is limited by the amount of leakage flow through clearance gaps which depends on flow properties that vary strongly with temperature for hydrogenic materials. A Diagnostic Twin Screw Extruder (DTSE) has been built to measure azimuthal and axial temperature distributions as well as torque, cooling power, and screw speed for H-2, D-2, and Ne extrusions. In this paper the experimental procedure for the DTSE is described and azimuthal temperature measurements at three locations along the screws are discussed The results show variations in temperature as large as 0.5 K azimuthally and > 0.5 K axially. The overall temperatures stay close to the solidification temperature and therefore support high backflow and explain extrudate stall scenarios experienced in other hydrogenic twin screw extruders. This temperature data is therefore useful to size tolerance gaps in future extruder designs and enables refinement of predictive models for continuous operation.
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Details
- Title
- DIAGNOSTIC TWIN SCREW EXTRUDER: INITIAL MEASUREMENTS OF CONTINUOUS Ne, H-2, AND D-2 EXTRUSIONS
- Creators
- JT FisherJW Leachman
- Publication Details
- FUSION SCIENCE AND TECHNOLOGY, Vol.68(2), pp.388-391
- Academic Unit
- Mechanical and Materials Engineering, School of
- Identifiers
- 99900564200601842
- Language
- English
- Resource Type
- Journal article