RT Journal Article
T1 Thermophysical and Tribological Properties of Highly Viscous Biolubricants
A1 Paredes, Xavier
A1 Liñeira del Río, José Manuel
A1 Gonçalves, David E.P.
A1 García Guimarey, María Jesús
A1 Pérez Comuñas, María José
A1 Seabra, Jorge H.O.
A1 Fernández Pérez, Josefa
K1 Contact angle
K1 Friction
K1 Lipids
K1 Thickness
K1 Viscosity
AB Two new highly viscous biodegradable oils are investigated for use in wind turbine gearboxes (BIO-G00) and in mechanical transmissions of agricultural tractors (BIO-G02). Studies on their thermophysical and tribological properties were performed. High-pressure–viscosity measurements were obtained up to 250 MPa and 363.15 K using a falling-body apparatus. The viscosity of BIO-G00 and BIO-G02 reaches maximum values of 14720 and 7072 mPa·s, respectively. The film thickness and the tribological performance, from boundary to full-fluid lubrication regimes, under a slide-to-roll ratio of 5% obtained in an EHD2 ball-on-disk test rig are reported. Film thickness has also been computed through the Hamrock and Dowson equation, considering the inlet shear heating (thermal correction factor) due to the high viscosity of both biolubricants. Differences between the experimental and theoretical film thicknesses are around 4% at 353.15 K and 14% at 303.15 K for both oils. The universal pressure–viscosity coefficients, αfilm, for both oils are lower than those of other mineral and synthetic oils. Higher friction coefficients are obtained for BIO-G00 in all of the studied lubrication regimes for the different rough disks and in the entire temperature range. A suitable wetting behavior on steel surfaces is observed for both selected oils.
PB American Chemical Society Publications
SN 0888-5885
YR 2022
FD 2022-06-06
LK http://hdl.handle.net/10347/32158
UL http://hdl.handle.net/10347/32158
LA eng
NO Xavier Paredes, José M. Liñeira del Río, David E. P. Gonçalves, María J. G. Guimarey, María J. P. Comuñas, Jorge H. O. Seabra, and Josefa Fernández Industrial & Engineering Chemistry Research 2022 61 (23), 8346-8356 DOI: 10.1021/acs.iecr.2c00915
NO Spanish Ministry of Economy and Competitiveness and the Xunta de Galicia have supported this work through GRC ED431C 2020/10 and ENE2017-86425-C2-2-R projects. The authors are grateful to the BIOVESIN (PSE-420000-2008-4) partners for the advice and for providing them the samples of the vegetable formulated oils and the reference lubricants. Dr. M.J.G.G. acknowledges a postdoctoral fellowship (ED481B-2019-015) from the Xunta de Galicia (Spain), and Dr. L.d.R. acknowledges the financial support through the Margarita Salas program (Ministry of Universities, Spain). The authors express their gratitude to Dr. K.R. Harris (University of New South Wales, Australia) for his high-pressure–viscosity study of DiPEiC9 and also to M.A. Marcos from the University of Vigo for his help with rheology tests.
DS Minerva
RD 27 abr 2026