Abstract
A fusion reactor must be fueled by solid pellet injection at the high field side to ensure uniform fuelling and meet the fuel cycle requirements. A reliable extrusion system must be developed to solidify and extrude the fuel in the form of a fine filament. Over the past few decades, various extrusion systems such as in-situ, piston-cylinder, single screw, twin screw extrusion were developed to progress into achieving the extrusion rate specified by ITER (International Thermonuclear Experimental Reactor). Among these techniques, twin screw extruder promises to be reliable due to its continuous operation and stable throughput. This review article has twin objectives. First, it seeks to provide an overview of developments carried out so far for the cryogenic extruders like conceptualization, prototype development and performance. The numerical modelling of cryogenic extruders is at infant stage. Therefore, the second objective of this paper is to review various numerical models from polymer extrusion research and explain the need to adopt those models to arrive at the more optimal design of an extruder. In addition, the thermo-physical properties of hydrogenic fuels are reviewed, which is very important for developing numerical models. Also, this paper brings out the critical gaps that exist in the CFD modelling of a twin screw extruder. The present review work would be of great importance to the scientific community working toward plasma fueling.
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Abbreviations
- EAST:
-
Experimental Advanced Superconducting Tokamak
- ITER:
-
International Thermonuclear Experimental Reactor
- JET:
-
Joint European Torus
- LHD:
-
Large Helical Device
- ORNL:
-
Oak Ridge National Laboratory
- SSE:
-
Single screw extruder
- TSE:
-
Twin screw extruder
- a:
-
Acceleration
- B:
-
Thread tip width
- c:
-
Specific heat capacity
- D:
-
Rate of deformation tensor
- f:
-
Field variable
- g:
-
Acceleration due to gravity
- G:
-
Local separation between two surfaces
- h:
-
Width of the flow channel
- H:
-
Height of the’C’ Chamber
- \(\overline{H}\) :
-
Step function
- k:
-
Flow Consistency Index
- l:
-
Die length
- m:
-
Number of Thread starts
- M:
-
Mass of the particle
- n:
-
Flow behavior Index
- N:
-
Screw speed
- P:
-
Pressure
- Q:
-
Volume Flow rate
- r:
-
Distance between particles
- R:
-
Radius of the screw
- S:
-
Pitch length
- T:
-
Temperature
- \(\overline{T}\) :
-
Extra stress tensor
- u:
-
Velocity in x direction
- v:
-
Velocity in y direction
- V:
-
Volume
- W:
-
Smoothing parameter
- x:
-
Coordinate
- y:
-
Coordinate
- z:
-
Coordinate
- β:
-
Angle of overlapping
- γ:
-
Shear rate
- δ:
-
Fight gap
- Δ:
-
Difference
- σ:
-
Calendar gap
- μ:
-
Viscosity of the fluid
- ε:
-
Side gap
- τ:
-
Shear Stress
- ψ:
-
Flight angle
- ω:
-
Angular velocity
- ρ:
-
Fluid density
- 0:
-
Yield point
- p:
-
Constant Pressure
- s:
-
Triple point
- th:
-
Theoretical
- v:
-
Constant Volume
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The research was funded by Board of Research in Nuclear Sciences Grant No. 39/14/21/2016-BRNS
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Ravikumar, P.S., Arumugam, S.K., Gangradey, R. et al. Development of Cryogenic Extrusion Techniques and Modelling of a Twin Screw Extruder: A Review. J Fusion Energ 40, 4 (2021). https://doi.org/10.1007/s10894-021-00297-2
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DOI: https://doi.org/10.1007/s10894-021-00297-2