Fine bubbles (FBs; <100 μm) were introduced into bio diesel fuel (BDF) to investigate their effects on combustion and emissions in a high-speed diesel engine. As a result, the brake specific fuel consumption decreased by up to 6.3 % with load-weighted average reductions of 4.2 % respectively. Simultaneously, brake specific NOx emissions were reduced by maxima of 10.2 % with load-weighted average reductions of 7.6 %. These results suggest that FB application enhances combustion efficiency and reduces emissions, with fuel-specific mechanisms depending on physical properties such as viscosity and oxygen content.
Nakatake et al. (Wed,) studied this question.