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The Rocle Test for Diesel and Bio-Diesel Fuel Lubricity
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Abstract
This bench test for lubricity of diesel fuels employs a crossed-axis roller on cylinder geometry. The roller on cylinder lubricity evaluator (ROCLE) yields a dimensionless lubricity number (LN) based on the ratio of wear area stress to Hertzian contact stress, all divided by the stable coefficient of friction.
Fuels yielding LN's greater than 1.0 are judged satisfactory. A range of lubricity numbers from 0.5 for kerosene to 1.7 for canola vegetable oil provides good tribological discrimination between various fluids. The addition of 2% canola methyl ester to low sulfur No.1 diesel produces equivalent lubricity to No.2 high sulfur diesel fuel.
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Citation
Galbraith, R. and Hertz, P., "The Rocle Test for Diesel and Bio-Diesel Fuel Lubricity," SAE Technical Paper 972862, 1997, https://doi.org/10.4271/972862.Also In
References
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- California Biodiesel Demonstration Project Spataru A. The ADEPT Group Inc. Los Angeles, California Nov. 1994
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- Measurement of Diesel Fuel Lubricity CEC, Coordinating European Council HFRR Fuel Lubricity Tester
- Lacey, P.I. Development of a Lubricity Test Based on the Transition from Boundary Lubrication to Severe Adhesive Wear in Fuels Lubrication Engineering 50 749 757 October 1994
- Galbraith, R. M. “Development of a Roller on Cylinder Lubricity Evaluator ( ROCLE ) Testing Machine for Diesel and Bio-Diesel Fuels,” University of Saskatchewan August 1997
- Young, W.C. “Roark's Formula's for Stress and Strain,” 6th New York, NY 647 665 1989
- Hertz P.B. “Winter Engine Wear Comparisons with a Canola Bio-Diesel Fuel Blend” Saskatchewan Canola Development Commission Report May 1995