Assessment of the lubricant behaviour of biodiesel fuels using Stribeck curves
authors Maru, MM; Trommer, RM; Almeida, FA; Silva, RF; Achete, CA
nationality International
journal FUEL PROCESSING TECHNOLOGY
author keywords Biodiesel; Friction; Lubricant behaviour
keywords LOW-TEMPERATURE PROPERTIES; VEGETABLE-OILS; METHYL-ESTERS
abstract The molecular structure (carbon chain length, degree of unsaturation and branching of the chains) and the presence of contaminants in a biodiesel have a critical influence on their lubricant behaviour. Ball-on-disc tri-bological tests were performed with two different standard reference materials for biodiesel - NIST SRM 2772 (soybean) and NIST SRM 2773 (animal fat). It is demonstrated that the Stribeck curves, the plots of coefficient of friction (p) vs. Stribeck parameter S (the product of viscosity with speed divided by the normal contact load), fit to a general polynomial equation of the type mu = mu(0) (1- K-BL x S + K-EHL X S-n). Constants K-BL and K-EHL reveal the contributions of the boundary lubrication (BL) and the elastohydrodynamic (EHL) phenomena, respectively. The animal fat biodiesel is the most effective fuel as it shows the highest KBL and the lowest K-EHL values leading to the most stable coefficient of friction regarding speed variation. This behaviour is attributed to the higher content of contaminants, namely mono- and di-glycerides, and the presence of sulphur in the animal fat biodiesel. (C) 2013 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0378-3820
year published 2013
volume 116
beginning page 130
ending page 134
digital object identifier (doi) 10.1016/j.fuproc.2013.05.010
web of science category Chemistry, Applied; Energy & Fuels; Engineering, Chemical
subject category Chemistry; Energy & Fuels; Engineering
unique article identifier WOS:000325844100017
  ciceco authors
  impact metrics
journal analysis (jcr 2019):
journal impact factor 4.982
5 year journal impact factor 4.733
category normalized journal impact factor percentile 81.577
dimensions (citation analysis):
altmetrics (social interaction):



 


Apoio

1suponsers_list_ciceco.jpg