Effect of different lubricating oil on the adsorption/desorption process of fuel in oil layer in an SI engine. (20th October 2016)

• Record Type: Journal Article
• Authors: Kushwaha, Garima; Saraswati, Samir; Paul, Bireswar
• Is Part Of: Lubrication science. Volume 29:Number 2(2017)
• Page Start: 73
• Page End: 91
• Publication Date: 2016-10-20
• Subjects: adsorption/desorption -- SI engine -- lubricating oils -- Henry's constant -- diffusion coefficient; Tribology -- Periodicals; Lubrication systems -- Research -- Periodicals; Surfaces (Technology) -- Research -- Periodicals; 621.89
• DOI: 10.1002/ls.1358
• Languages: English
• ISSNs: 0954-0075

Abstract

Abstract: A diffusion equation given by Fick's law is used to study the effect of different lubricants on adsorption/desorption process of fuel in oil layer that contributes to about 25–30% of total engine‐out hydrocarbon emissions in spark ignition engine. A comparative study is carried out between the six lubricants, namely, squalane (C30 H62 ), SAE0W20, SAE10W30, SAE10W40, SAE10W60 and SAE15W60. The Henry's constant and diffusion coefficient are found to be the two most important parameters that affect the amount of fuel in oil layer. The Henry's constant dominates the adsorption/desorption process at high temperatures of oil, whereas at low temperatures, diffusion coefficient effect prevails. The percentage of fuel adsorbed/desorbed into oil layer is found to be dependent on engine speed, equivalence ratio and engine load. The results are found to be in good agreement with experimental trends of hydrocarbon emissions when tested on a single cylinder SI engine using the lubricants SAE10W30 and SAE10W40. Copyright © 2016 John Wiley & Sons, Ltd.