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Research Overview
Manav Vohra is a PhD student at Duke University researching reactive particles. His objectives are to 1) develop and validate models for the aerobic oxidation of Zr/Al multilayers, 2) generalize these models to include biocidal particles, and 3) develop and validate models for the anaerobic reaction of Zr/Al multilayers and generalize them to include particle compacts. His research will help enable applications like high-strength materials, coatings, capacitors, and bio-agent defeat.
Research Overview
- 1. Research Overview Manav Vohra Duke University March 21, 2013
- 2. Reactive particles Applications: ultra-high strength materials high performance coatings high performance capacitors and magnetic transducers smart materials for sensors high performance visible optics bio-agent defeat (Fritz et al.) Manav Vohra (Duke) Research Overview March 21, 2013 2/6
- 3. Bio-agent defeat Background &Motivation: Slow aerobic reactions in 1:1 Zr/Al foils High temperatures sustained much longer than rapid formation reactions Temperature fluctuations during oxidation are very small O(10−1 ) Objectives of my doctoral research: Develop and validate aerobic oxidation model for 1:1 Zr/Al multilayers (Joress et al.) Generalize oxidation model for presence of biocidal particles Develop and validate anaerobic reaction model for 1:1 Zr/Al multilayers Generalize reaction model for compact of particles Self propagating reaction front Manav Vohra (Duke) Research Overview March 21, 2013 3/6
- 4. Oxidation model Thermal model:energy balance Comparison with experiments : 1700 Experiment 1600 Simulation 1500 Temperature(K) 1400 1300 1200 1100 1000 900 0 1 2 3 4 Time(seconds) Kinetic models: diffusion and interface limited growth Foil thickness 49 µm Foil width 12.2 mm Number of bilayers 491 Bilayer thickness 81.5 nm Manav Vohra (Duke) Research Overview March 21, 2013 4/6
- 5. Anaerobic reaction model Estimate activation energy, Ea for foil ignition hot plate tests explain low estimates Predict diffusivity pre-exponent, Do for low T by comparing simulations with experiments Uniform ignition temperature profiles Estimate reaction velocities for different bilayers Estimate and optimize diffusion parameters for high T using velocity estimates Propose a composite diffusivity plot Computational domain Manav Vohra (Duke) Research Overview March 21, 2013 5/6
- 6. Front propagation: Zr/Alnanolaminate foil Manav Vohra (Duke) Research Overview March 21, 2013 6/6