Abstract
This paper studied the unsteady seepage characteristics of lubricant stored in hydrogel under different initial permeability. Results show that the distribution of the permeability is determined by the deformation of hydrogel. The normal velocity and normal pressure gradient on the hydrogel surface have diffusion, fluctuation and stabilization processes. The normal pressure gradient is the internal cause that drives the change of the velocity. With the increase of the initial permeability, the seepage velocity increases significantly. Higher initial permeability leads to a higher exudation rate of hydrogel at the initial stage of loading, but the exudation is unsustainable. Considering the instantaneous seepage rate of the lubricant and the long-term lubrication, it is necessary to reasonably design the initial permeability.
Published Version
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