Effects of Exit Diameter on Ethanol Jet with Local Contact Microwave Heating

Ethanol jet phenomena were observed with local contact microwave heating. The ethanol jet heights (velocities) and the shapes were measured by the high speed video camera (Redlake Motionmeter, 1000 fps. black & white CCD. 292pix×110pix, 0.2mm special resolution) and the effects of the exit diameter on the velocity were considered. The microwave output power was from 20W to 60 W. The microwave generator was MATSUSHITA TO-465 A with N-type connector. The coaxial cable was FUJIKURA 3.5 D QEFV (5.6 mm of outer diameter). The exit diameter was from 1 mm to 6 mm. The test section was covered by alumimum plates of 2 mm thickness and the microwave shader (Nisshinbo Engineering MP 135 R-20). The fuel chamber was brass. The jet shapes had many variations as fir tree type, umbrella type, mushroom type, and so on. As the results, the jet velocity was increased with the microwave output power and showed a maximum at an exit diameter in this research.