Demonstration of Ethanol and JP-8 Fuel Atomization Using Micromachined Silicon Multiplexed Electrosprays
Final rept. Aug-Dec 2008
ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
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This work discusses the fabrication and experimental testing of multiplexed electrospray ESpray devices micromachined in silicon substrates. Variations to the experimental test stands from previous work demonstrating Ethanol spraying are described for the successful demonstration of JP-8 spraying. Five different ESpray devices were microfabricated to gain an understanding of the operating limits for stable electrospraying. The microfabrication of ESpray devices consists of independently fabricating its two components extractor and nozzle array layers with standard photolithography and deep reactive ion etching DRIE of silicon substrates. Precise alignment 2 micrometer and assembly of silicon nozzle and extractor layers is accomplished with optical fibers embedded between the surfaces of each layer. Devices with 90 micrometer and 75 micrometer outer diameter OD nozzles showed electrospraying of Ethanol over a range of applied voltages and flow rates. Tests using JP-8 fuel with 1 Stadis 450 to enhance electrical conductivity showed flow rates in excess of 0.50 mlhrnozzle with 75 micrometer O.D.. devices-an increase compared to Ethanol. Consequently, a continuous and stable electrospray was shown for extended periods 30 min for both Ethanol and JP-8 tests.