Abstract
The design, fabrication, successful demonstration and characterization of a microfabricated steam generator based on the homogeneous catalytic decomposition of hydrogen peroxide are presented. The device consists of a mixer, a reactor and a nozzle, and it produces a jet of high-speed steam that can be used for driving ejector pumps and for nanosatellite microthrusters. Numerically implemented coupled chemical, thermal and fluidic modeling was used to design the device, which was then fabricated via bulk micromachining and enclosed in a thermally insulating package. The device operated successfully with 90% peroxide catalyzed by a ferrous chloride tetrahydrate solution. Refractive index analysis is used to confirm full peroxide decomposition, and visual inspection and temperature measurements are used to confirm full water vaporization. The experimental results are analyzed to provide comprehensive model verification.
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