Emulsified nano Al₂O₃ – Jatropha methyl ester blends: application in variable compression ratio engine

Abstract

Purpose The purpose of this paper is to assess the influence of blends of Jatropha methyl ester (JME) and its nano Al2O3 emulsion on variable compression ratio diesel engine. The oxygen in alumina contributed for the smooth burning and resulted in improved performance and emissions. Design/Methodology/Approach The biodiesel (methyl ester) is prepared from the raw Jatropha oil. The B10, B20 and B30 blends of and their nanoemulsions are prepared with the 25, 50, 75 and 100 ppm of nano Al2O3. The prepared JME blends and its nanoemulsions are tested in a variable compression ratio (VCR) diesel engine to evaluate the engine performance and emission characteristics. Findings The nanoemulsion B20 + 50 ppm has given maximum brake thermal efficiency (BTE), and with the increased proportion of nanoparticle, the BTE was reduced. Also, the specific fuel consumption is lowest (0.2826 kg/kWh) for B20 + 50 ppm at the compression ratio 16.5 and full load which is 4.10% lower than the diesel and 5.8% lower than the B20 blend. As the load increases, NOx emission increases owing to higher peak temperatures in the combustion chamber. The JME-nano Al2O3 emulsion reduces the HC and CO emission compared with all other fuels. Originality/Value Novel nano emulsions are prepared, characterized and tested on VCR engine.

Comparative analysis of renewable diesel and biodiesel produced from Jatropha oil

“…and water content 15%–30% by wt 5,9 Emulsification is a process by which two different immiscible liquids are dispersed in each other with the help of a third substance known as emulsifier 8,10 . It is shown in a few research papers that with the help of nanoparticles in biodiesel emulsions, the stability and emissions can be improved 11 .…”

“…5,9 • Emulsification is a process by which two different immiscible liquids are dispersed in each other with the help of a third substance known as emulsifier. 8,10 It is shown in a few research papers that with the help of nanoparticles in biodiesel emulsions, the stability and emissions can be improved. 11 Seela et al 8,11,12 shows that multi-walled nano carbon tubes and nano Al 2 O 3 when used as an emulsifier with Jatropha Methyl Ester improves stability, flash point and fire point.…”