A Model Configuration for Studying Stationary Grease Bleed in Rolling Bearings

Qierui Zhang*, Frieder Mugele, Dirk van den Ende, Piet M. Lugt

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

3 Citations (Scopus)
43 Downloads (Pure)


Five common ball bearing greases were studied using a grease-on-paper test configuration, where the bleeding of greases is described by the dynamics of a driving capillary pressure provided by the paper and its opposing counterpart in the grease matrix. The Washburn-like model for extracting the retaining capillary pressure, determined by the affinity of the oil for the grease matrix, has proven to be applicable for greases made of various type of thickeners and base oils, and can potentially contribute to modelling the bleeding of stationary grease as well as to monitoring the change in bleeding properties of greases in a bearing.

Original languageEnglish
Pages (from-to)1127-1137
Number of pages11
JournalTribology transactions
Issue number6
Publication statusPublished - 21 Oct 2021


  • UT-Hybrid-D
  • Grease bleeding
  • Washburn-like model
  • Oil-matrix affinity


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