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Physical Properties of Emulsion Fuel (Water/Oil-Type) and Its Effect on Engine Performance under Transient Operation
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Abstract
A water/Oil type emulsified fuel has been demonstrated to decrease the harmful exhaust emissions and increase a thermal efficiency of internal combustion engine experimentally(1)*. However, an emulsified fuel is not currently used for internal combustion engines.
When we try to use an emulsified fuel for the internal combustion engines, especially for a compression ignition engine, we should clear the physical properties of emulsified fuel. Because the viscosity of the emulsified fuel affects the spray characteristics and following combustion characteristics.
It is commonly recognized that the viscosity of emulsified fuel is much higher than that of the base fuels. However, there are no data which show the viscosity increase of emulsified fuel.
We proposed an newly introduced specific surface area Sp/Se to estimate the viscosity of the emulsified fuel. Se is the surface area of emulsified fuel which is assumed to be spherical, and Sp is the sum of the surface area of distributed water droplets (which also assumed to be spherical) in the emulsified fuel.
The more the water content increases, the more the value of Sp/Se increases. The relative viscosity of the emulsified fuel is proportional to the value of Sp/Se.
Furthermore, we showed that the emulsified fuel contains air bubbles which change the bulk modulus of elasticity. Therefore, the above mentioned physical properties of emulsified fuel affect the engine performance especially under transient operation. A pre-chamber type compression ignition engine was operated by an emulsified fuel under transient conditions to demonstrate the effect of above mentioned physical properties on the engine performance.
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Sawa, N. and Kajitani, S., "Physical Properties of Emulsion Fuel (Water/Oil-Type) and Its Effect on Engine Performance under Transient Operation," SAE Technical Paper 920198, 1992, https://doi.org/10.4271/920198.Also In
References
- Murayama T. Tsukahara M. Morishima Y. Miyamato N. “Experimental Reduction of NOx, Smoke, and BSFC in a Diesel Engine Using Uniquely Produced Water (0-80%) to Fuel Emulsion” SAE Paper 780224 1978
- Lawson, A Last A.J. “Modified Fuels for Diesel Engines by Application of Unstabilized Emulsions” SAE Technical paper 790925 1979
- Pangonis W.J. Heller W. “Angular Scattering Functions for Spherical Particles” Wayne University press 1960
- Ooinoue H. “Series of Heat Engine, No.6” 63 Sankaido 1961
- Mori Y. Otutake N. “On the viscosity of suspensions” Chemical Engineering 20 9 488 494 1956
- Kitaura Y. Nagase Y. “Pipe Flow and Viscosity of Coagulative Suspension-Liquid” Chemical Engineering 31 l2 1155 1160 1967
- Einstein A. “Eine neue bestimmung der Moleküldimensionen” Ann.Phy. 4 289 306 1906
- Vand V. “Viscosity of solutions and suspensions 1” J.Phys.Colloid Chem. 52 277 321 1949
- Guth E. Simha R. “Untersuchung über die Viskosität von Suspemsionen Lösungen 3. über die Viskosität von Kugelsuspensionen” KolloidZeitschrift Band 74Hrft3 266 275 1936
- Robinson J.V. “The viscosity of suspensions of spheres” Phys.Collod.Chem. 53 1949 1042
- Dryer F.L. Glassman I. “Fundamental Combustion Studies of Emulsified Fuels for Diesel Applications” Final Report,,(July 1,1974 to September 30, 1977) U.S. Department of Commerce, National Technical Information Service 1977