A capillary-based model system for hydrodynamic spreading in porous media

Qierui Zhang

Research output: Contribution to conferencePosterAcademic


A Washburn-based model for oil release from a patch of lubricating grease:

Lubricating grease, the most common lubricant for rolling bearings, consists of a thickener matrix and mobile base oil. This base oil is slowly released from the grease and provides the bearing with a thin film that separates the contacting surfaces, giving the bearing a long operational life. This so-called “grease bleeding” process is studied in a model configuration consisting of a defined volume of grease on a sheet of absorbing paper. The volumetric flux is determined by the transmission intensity of the paper. A continuum model has been developed using a Lucas-Washburn like approach, where both the grease and the paper are described as porous materials each with their own properties. The creeping oil flow is caused by the difference in wettability of the grease matrix and the paper.
Original languageEnglish
Publication statusPublished - 22 Jan 2019
EventPhysics@Veldhoven 2019 - De Koningshof, Veldhoven, Netherlands
Duration: 22 Jan 201923 Jan 2019


ConferencePhysics@Veldhoven 2019
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