Substitute procedure for engine deposition test to investigate diesel and biodiesel fuel deposits

The aim of this study was to investigate fuel deposit development and its influences using simplified methods, which are referred to as the hot surface deposition test (HSDT) instead of using the engine deposition test. Both the HSDT and the engine deposition test have similar tendencies in terms of deposit development and soot fraction in deposits. The fuels tested are diesel fuel (DF), palm oil based methyl ester biodiesel fuel (B100) and bioblended DFs (B50, B20 and B5). Deposit development in the HSDT depended on the droplet impingement intervals, hot surface temperatures, fuels, deposit properties, initial stage of deposition and competition phenomena during the deposit formation. These factors determined the existence of the wet surface condition and the amounts of deposits accumulated. The initial wet surface condition was not the main reason for the rapid development of deposits. Biodiesel fuel and bioblended DF showed rapid development tendencies. Fewer amounts of deposits from DF were observed.