Dust mobilization problem in an experimental nuclear reactor: experiments with stardust and simulations to validate a first re-suspension numerical model
Creators: name: MALIZIA, ANDREA
Publisher: name: Università degli Studi di Roma "Tor Vergata"
Year: 2010
Subjects: subject: iter; nuclear fusion; dust; stardust; LOVA; CFD
subject: iter
subject: nuclear fusion
subject: dust
subject: stardust
subject: LOVA
subject: CFD

description: 22. ciclo
description: 1. Dust in a magnetic confinement fusion devices and its impact on operations 1.1 introduction 1.1.1 iter main features [7] 1.2 plasma material interactions (pmis) 1.2.1 plasma interaction with the main chamber 1.2.2 plasma interaction with the divertor 1.2.2.2 the divertor 1.2.2.2 the interaction modes 1.2.3 main effects of interactions 1.2.4 reactor structure and materials 1.3 dust safety concerns 1.3.1 dust mobilization problems due to a lova or loca8 accidents 1.4 state of the art of dust mobilization analisys 1.4.1 results obtained in u.s.a [73] 1.4.2 results obtained in japan [77] 1.4.2 results obtained in italy since 2007 . - 2 stardust facility 2.1 hardware components for stardust 2.1.1 hardware to achieve correct boundary conditions 2.1.1.1 external walls’ heaters 2.1.1.2 vacuum pump 2.1.1.3 line for compressed air 2.1.2 hardware for equipment control 2.1.2.1 pressure gauges 2.1.2.2 electro-pneumatic valve 2.1.2.3 feed valve 2.1.2.4 air pressure control valve 2.1.2.5 thermocouples type j 2.1.3 hardware to perform experimental tests 2.1.3.1 flow meter 2.1.4 acquisition and control system hardware 2.1.4.1 ni 9219 card 2.1.4.2 ni 9211 card 2.1.4.3 ni 9485 card 2.1.4.4 ni 9485 card 2.2 software used for stardust experiments 2.3 stardust experimental setup 2.3.1 experimental setup for quantitative experimental mesurements done in 2007 2.3.2 experimental setup for flow field velocity values acquisition inside stardust 2.3.2.1 pressure transducer 2.3.2.2 experimental set-up may 2009 2.3.2.3 experimental set-up september-october 2009. - 3 Dust resuspension experiments inside stardust facility 3.1 introduction 3.2 experiments with carbon dust 3.2.1 carbon dust_ valve b_tray under obstacle_twall : 110 °c 3.2.2 carbon dust_valve b_tray under the bridge_ twall : 110 °c 3.2.3 carbon dust_valve b_tray over the bridge_ twall : 110 °c 3.2.4 carbon dust_valve a_tray under obstacle_ twall : 110 °c 3.2.5 carbon dust_valve a_tray under the bridge_ twall : 110 °c 3.2.6 carbon dust_valve a_tray over the bridge_ twall : 110 °c 3.2.7 carbon dust_valve b_tray under obstacle_ twall : 25 °c 3.2.8 carbon dust_valve b_tray over the bridge_twall : 25 °c 3.2.9 carbon dust_valve a_tray under obstacle_twall : 25 °c 3.2.10 carbon dust_valve a_tray over the bridge_ twall : 25 °c 3.2.11 carbon dust_valve a_tray over the bridge_ twall : 110 °c_slit 3.2.12 carbon dust_valve a_tray under the bridge_ twall : 110 °c_slit 3.2.13 carbon dust_valve b_tray under the bridge_ twall : 110 °c_slit 3.2.14 carbon dust_valve b_tray under the bridge_ twall : 110 °c_slit 3.3 experiments with tungsten dust 3.3.1 tungsten dust_valve b_tray under obstacle_ twall : 110 °c 3.3.2 tungsten dust_valve b_tray under the bridge_ twall : 110 °c 3.3.3 tungsten dust_valve b_tray over the bridge_ twall : 110 °c 3.3.4 tungsten dust_valve a_tray under obstacle_ twall : 110 °c 3.3.5 tungsten dust_valve a_tray under the bridge_ twall : 110 °c 3.3.6 tungsten dust_valve a_tray over the obstacle_ twall : 110 °c 3.3.7 tungsten dust_valve b_tray under obstacle_ twall : 25 °c 3.3.8 tungsten dust_valve b_tray over the bridge_ twall : 25 °c 3.3.9 tungsten dust_valve b_tray under the bridge_ twall : 25 °c 3.3.10 tungsten dust_valve a_tray under the bridge_ twall : 25 °c 3.3.11 tungsten dust_valve a_tray over the bridge_ twall : 25 °c 3.3.12 tungsten dust_valve a_tray under the bridge_ twall : 25 °c 3.3.13 tungsten dust_valve a_tray over the bridge_ twall : 110 °c_slit 3.3.14 tungsten dust_valve a_tray under the bridge_ twall : 110 °c_slit 3.3.15 tungsten dust_valve b_tray over the bridge_ twall : 110 °c_slit 3.3.16 tungsten dust_valve b_tray under the bridge_h_ twall : 110 °c_slit 3.4 experiments with stainless steel dust 3.4.1 stainless steel_valve b_tray under the obstacle_ twall : 110 °c 3.4.2 stainless steel_valve b_tray under the bridge_twall : 110 °c 3.4.3 stainless steel_valve b_tray over the bridge_ twall : 110 °c 3.4.4 stainless steel_valve a_tray under the obstacle_ twall : 110 °c 3.4.5 stainless steel_valve a_tray under the bridge_ twall : 110 °c 3.4.6 stainless steel_valve a_tray over the bridge_ twall : 110 °c 3.4.7 stainless steel_valve a_tray over the bridge_ twall : 25 °c 3.4.8 stainless steel_valve a_tray under the obstacle_ twall : 25 °c 3.4.9 stainless steel_valve b_tray over the bridge_ twall : 25 °c 3.4.10 stainless steel_valve b_tray under the obstacle_ twall : 25 °c 3.4.11 stainless steel_valve a_tray over the bridge_ twall : 110 °c_slit 3.4.12 stainless steel_valve a_tray under the bridge_ twall : 110 °c_slit 3.4.13 stainless steel_valve b_tray over the bridge_twall : 110 °c_slit 3.4.14 stainless steel_valve b_tray under the bridge_twall : 110 °c_slit 3.5 Conclusion. - 4. Experimental velocity measurements inside stardust facility 4.1 introduction 4.2 pressure transducer 4.2.1 techical characteristics 4.2.2 working principle 4.2.3 velocity data acquisition 4.2.3.1 error analysis 4.2.3.2 experimental data treatment 4.3 velocity measurements, results and data discussion 4.3.1 obstacle influence on experimental velocity values [89,91] 4.3.1.1 pressure transducer without obstacle and under obstacle, valve a 4.3.1.2 pressure transducer without obstacle and under obstacle, valve b 4.3.1.3 pressure transducer inside obstacle, under the bridge, valve b, with and without slit 4.3.1.4 pressure transducer inside obstacle, over bridge, valve a, with and without slit 4.3.2 velocity mapping inside stardust 4.3.2.1 introduction 4.3.2.2 experimental results on x-y plane (z=0) 4.3.2.2.1 experimental results from valve a 4.3.2.2.2 experimental results from valve b 4.3.2.2.3 experimental position of interest for velocity values measurements (x-y plane) 4.3.2.3 experimental results on z-y plane (x= 6 cm, and x=15 cm) 4.4 conclusion. - 5. Numerical simulation inside stardust facility 5.1 introduction 5.2 governing equations and thermodynamic models 5.3 real gas model 5.4 preprocessing 5.5 numerical schemes and parameters 5.6 numerical results 5.6.1 simulation with obstacle 5.6.2 simulation without obstacle 5.6.3 general results 5.6.3.1 vaccum breakdown 5.6.3.2 temperature behaviuor 5.6.3.2 dust pattern in case of lova. - 6 experimental and numerical results comparison 6.1 introduction 6.2 boundary conditions [89,91] 6.3 static pressure output [89,91] 6.3 dust experiments and simulation results comparison [89,91] 6.4 flow field velocity experiments and simulation results comparison 6.4.1 valve a 6.4.2 valve b 6.4.3 conclusion. - Conclusion