Comparative Analysis of Boron and Silane Boron Nanofuel Droplet Combustion

초록

This study experimentally investigates the thermophysical properties and droplet combustion behavior of boron and silane boron nanofuels. Silane boron nanoparticles were prepared by coating boron nanoparticles with (3-aminopropyl)triethoxysilane (APTS), and nanofuels were formulated by dispersing 2 and 4 wt.% of boron/silane boron nanoparticles in butanol. Span 80 (1 and 2 wt.%) was added to induce puffing, an explosion at the droplet surface caused by vapor formation inside the droplet, which enhances combustion through droplet atomization. The addition of nanoparticles and surfactant did not significantly affect viscosity or surface tension. However, boron nanofuels containing Span 80 showed poor dispersion stability at room temperature and at 100 degrees C, promoting puffing and increased boron flame luminosity due to enhanced atomization. In contrast, silane boron nanofuels exhibited improved dispersion stability, resulting in weaker puffing and reduced boron flame luminosity. The effective burning rate increased for silane boron droplets due to enhanced thermal conductivity. Boron flame emission was analyzed using a spectrometer at BO2 emission bands of 493, 517, 547, and 578 nm. Overall emission intensities were lower for silane boron nanofuels because reduced puffing resulted in weaker boron flame emission. For both fuels, Span 80 increased BO2 emission intensity through surfactant-induced puffing.

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