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Resonant Acoustic Mixing Mix Process Scale Up

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Presentation on theme: "Resonant Acoustic Mixing Mix Process Scale Up"— Presentation transcript:

1 Resonant Acoustic Mixing Mix Process Scale Up
Distribution Statement A: Approved for Public Release, distribution unlimited Resonant Acoustic Mixing Mix Process Scale Up 2018 CAD/PAD Technical Exchange Workshop

2 Resonant Acoustic Mixing
What is Resonant Acoustic Mixing (RAM) Non-contact mixing High intensity vibrations up to 100g to create highly efficient particle collisions and acoustic waves Allows direct scalability from lab to production units Bulk Distributive Mixing Intense Dispersive Mixing Resonant Acoustic Mixing: Shaking up the future of energetic mixing Distribution Statement A: Approved for Public Release, distribution unlimited

3 NSWC IHEODTD RAM Overview
Two LabRAMs (500g capacity) operating HTPB propellant and PBX formulations Mixed in end units Small rocket motor and grenade Molding powder Lacquer and full formulation Coated RDX Ignition delay formulation Multiple R&D projects Distribution Statement A: Approved for Public Release, distribution unlimited

4 NSWC IHEODTD RAM Overview
80-pound capacity Approved for live operations January 31, 2018 Distribution Statement A: Approved for Public Release, distribution unlimited

5 LabRAM vs RAM-5 Mixing LabRAM Maximum mix size 500g
Often need to limit mix size further to reach higher accelerations (under-powered for 500g, high acceleration mixes) Have used a variety of mix vessels based on mix size RAM-5 Nominal 80 pound mix capacity Currently have one mix vessel, but intent to be able to mix in variety of geometries Mass/geometry effect on mixing? Resodyn claims minimal changes to mix cycles to scale up Previous LabRAM studies indicate geometry of mix affects mixing Distribution Statement A: Approved for Public Release, distribution unlimited

6 LabRAM Mix Variable Study
In range studied (PBX simulant), viscosity and density of mix had negligible effect Vacuum and mix mass had little effect Resodyn states vacuum can significantly affect mixing Geometry of mix is important Diameter may not be important Height of mix, L/d of mix, and/or “fill ratio” important (not independent enough to differentiate between them) Factors to consider in scale-up to RAM-5 Reduced Model: Important Variables Distribution Statement A: Approved for Public Release, distribution unlimited

7 LabRAM Mixing Temperature Rise vs. Mix Quality
Hypothesis: Energy input to mix should correlate to amount of mixing Calculate power from RAM parameters Total energy input to mix over full mix time Measure from temperature rise– should be the same Compare energy input/temperature to degree of mixing Uncured areas Can we use this in scale up? Can do same calculation on RAM-5 Energy input per mass of mix? Two-part premix, 500g, 27 minutes mixing Final Temperature 65C Distribution Statement A: Approved for Public Release, distribution unlimited

8 LabRAM Mixing Temperature Rise vs. Mix Quality
Well mixed PBXN-110 18 minutes total mixing Final Mix Temp 75C 10.9 cal/g energy input PBXN-110 with agglomerates 25 minutes total mixing Final Mix Temp 50C 4.7 cal/g energy Agglomerations Uncured areas Two-part premix, 500g, 10 minutes mixing Final Temperature 44C Poorly mixed N-60 Well mixed N-60 Two-part premix, 500g, 27 minutes mixing Final Temperature 65C Distribution Statement A: Approved for Public Release, distribution unlimited

9 NSWC IHEODTD RAM-5 Mixing
PBXN-110 6 mixes made PBXN-110 Type 1 and Type 2 Used mix cycles from successful LabRAM 300g mixes Tested for Lot Acceptance Testing Meets requirements Within historical norms Material from Type 1 mix in aging for full qualification RAM-5 PBXN-110 Distribution Statement A: Approved for Public Release, distribution unlimited

10 RAM-5 Mixing PBXN-110 on RAM-5: Energy input to mix Uncured areas Mix
eomT (⁰C) Energy (cal/gr) -007 40 8.0 Equipment delay between weighup and mix start -008 53 11.4 agglomerates -032^ 44 7.9 ^stopped to view mix; mixed additional cycle -032 50* 12.3 start of last cycle -036 50 9.5 -037 -064 61 14.1 Very few agglomerates 63* 18.5 No agglomerates *T = 48C at start of cycle -008^ ^Middle of E=9.5 cal/gr; for comparison to mixes -032, 036, 037 -064^ 51 Type 1 and Type 2 formulations Mix sizes of lbs Mix L/d of 0.8 to 1.3 Mix times 9-15 minutes Uncured areas Distribution Statement A: Approved for Public Release, distribution unlimited

11 RAM-5 Mixing Uncured areas
Acceleration and power input to mix for 3 80 pound mixes Uncured areas Mix size, formulation, addition sequence and acceleration setpoints were the same Mix vacuum method different Mix -032 started vacuum before starting cycle 2 (with mix at rest) Mix -036 started vacuum at start of cycle 3, while mixing Mix -037 started vacuum before cycle 3 (with mix at rest) Two-part premix, 500g, 27 minutes mixing Final Temperature 65C Distribution Statement A: Approved for Public Release, distribution unlimited

12 RAM-5 Mixing Some mixes had Class 2 CXM coat sides of vessel, esp larger mixes Changing order of addition resolved issue Uncured areas Mix -036 after mixing Two-part premix, 500g, 27 minutes mixing Final Temperature 65C Distribution Statement A: Approved for Public Release, distribution unlimited

13 NSWC IHEODTD RAM-5 Mixing
PBXN-9 1 mix made Full spec analysis in progress Same mix cycles used as in LabRAM RAM-5 PBXN-9 Distribution Statement A: Approved for Public Release, distribution unlimited

14 RAM-5 Upcoming work HTPB Propellants BC-16; scale up 300g LabRAM mix
EC-10 Densified EC-10 with tungsten (potential) Mix in motor case/unique geometry items Distribution Statement A: Approved for Public Release, distribution unlimited


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