低アスペクト比Taylor-Couette流れ水－植物油エマルジョンの周波数解析

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  • Frequency Analysis of Taylor-Couette Flow with Small Aspect Ratio in Water-Vegetable Oil Emulsion

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<p>The emulsification method is not only one of the potentially effective techniques to reduce fossil fuel consumption but also exhaust emission from diesel engines. Water-in-Oil (W/O) emulsified fuel is reported to reduce the emissions of NOx, SOx, CO and particulate matter (PM) caused by a decrease in combustion temperature and a micro explosion in combustion. However, the emulsified fuel shows non-Newtonian properties called pseudoplastic flow as water content ratio increases. Since a viscosity of pseudoplastic flow decreases with increasing shear rate, the W/O emulsified fuel causes clogging of fuel injector, decrease of combustion efficiency due to deterioration of fuel spray in high water content ratio. It is important to know a flow state of the emulsified fuel in mixing conditions. In this study, we evaluated W/O emulsified fuels using ultrasonic measurement, produced 10 %, 20 %, 30 % water-vegetable oil emulsion at 300-800 rpm with a Taylor-Couette flow reactor. We measured velocity profiles and attenuation of echo at every 100 rpm utilizing the ultrasonic Doppler method and echo intensity measurement. Then, As a result, transitions of the velocity profiles and the echo attenuation were different in each water content ratio.</p>

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