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Träfflista för sökning "FÖRF:(Anders Pettersson) srt2:(2000-2004)"

Sökning: FÖRF:(Anders Pettersson) > (2000-2004)

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  • Pettersson, Anders, et al. (författare)
  • Film formation capability of environmentally adapted base fluids
  • 2004
  • Ingår i: Proceedings of the ASME/STLE international joint tribology conference. - New York : American Society of Mechanical Engineers. - 791841812 ; , s. 379-385
  • Konferensbidrag (refereegranskat)abstract
    • The film formation capabilities of six environmentally adapted ester based fluids have been investigated using optical interferometry in a Ball and Disc apparatus. A mineral oil was used as a reference. The properties and molecular structure for the tested base fluids are well known from earlier investigations. The fluids were tested at three different slide/roll ratios of 0, 0.6, and 1.2. The film formation capability was compared to the molecular structure and other properties. It was found that some of the fluids maintain a superior lubricating film at high slide/roll ratios than others, because of their molecular properties. A high level of carboxylate groups in the ester molecule gives high thermal conductivity and heat capacity, which promotes heat transportation out of the contact and this also maintain separation
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  • Pettersson, Anders (författare)
  • Properties and performance of environmentally adapted synthetic esters
  • 2004
  • Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • The lubricants of the future have to be more environmentally adapted, have a higher level of performance, and lower total life cycle cost (LCC) than commonly used lubricants today. Since we live on a planet with finite resources, we have to think about coming generations and work for a sustainable development in the field of tribology. To be able to formulate those lubricants, the properties of the base fluids have to be well known. Base fluid properties that influence the formulated lubricant performance could be divided in to three different groups. These groups are; physical, chemical and film formation properties. In this study are properties from all of these groups investigated to improve the understanding on there influence on base fluid overall performance. There are more or less environmentally adapted base fluids available for formulation of lubricants. They could be divided in to different groups, mineral, semi synthetic and synthetic fluids. Synthetic fluids could be of different type: PAO (poly alpha olefins), Synthetic ester, Poly glycols and others. The most interesting group for formulation of environmentally adapted lubricants are the synthetic esters. In this thesis the properties for a large number of environmentally adapted ester base fluids are studied in detail. The tested properties relate to the macroscopic / molecular behaviour and include: viscosity-temperature-pressure-effects, thermal conductivity, and heat capacity per unit volume. The film formation capability in EHD contacts is also studied. Different connections between the molecular structure and the performance for the fluids are discussed. As an example, it is found that a large number of carboxylate groups in the ester molecule are improving the thermal properties, and thereby a thicker lubricating film could be maintained in highly loaded, high slip contacts.
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  • Pettersson-Reif, B. Anders, 1966, et al. (författare)
  • Proper orthogonal decomposition of stratified shear turbulence
  • 2004
  • Ingår i: Advances in Turbulence X, Proceedings of the tenth European turbulence conference, Andersson, H.I. and Krogstad, P.- Å. (Eds.), June 29 - July 2, Trondheim, Norway.
  • Konferensbidrag (refereegranskat)
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