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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

Increased Reactivity with Increased Density of Nano-Aluminum and I2O5 when Mixed Using Water as a Solvent

Dylan K. Smith
Department of Mechanical Engineering, Texas Tech University, Lubbock, TX 79409

Michael Bello
Department of Mechanical Engineering, Texas Tech University, Lubbock, TX 79409

Michelle L. Pantoya
Department of Mechanical Engineering, Texas Tech University, Lubbock, Texas 79409 USA

Abstract

When Iodine pentoxide I2O5 is mixed with nano Al in water, a unique crystal structure is created that increases flames speeds up to 3,200m/s and releases up to 100% of the products as vapor. By mixing in water, a pre ignition reaction (PIR) is induced which is a reaction between the I2O5 passivation shell in Al particles and halogens that allows oxygen from the I2O5 to react with Al at temperatures as low as 110°C. The density of the crystals that are formed increases with the amount of water used in mixing and for this mixture, reactivity increases as density increases with the fastest flame speed(3,200m/s) being seen at 90% of the theoretical maximum density(TMD). The magnitude and onset temperature of the PIR along with the flame speed and density of the crystals was found to be affected by the ratio of water to Al used during mixing. A water to Al ratio of 6:1 was found to create the fastest flame speeds along with the lowest PIR onset temperatures and highest density. Increasing the size of Al particles reduces flame speeds, but similar trends in reactivity vs density have been seen. Tailoring the reactive properties of this mixture can be achieved by adjusting the water to Al ratio and size of Al particles to suit specific applications.

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