潤滑膜の多孔質性を考慮した希薄気体修正レイノルズ方程式の導入

概要

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To solve ultra-thin gas lubrication problems encountered in analyzing a running surface coated with giant molecule lubricant film, a new lubrication model is derived. In this model the liquid lubricant film is replaced with permeable material, and the boundary between gas and liquid is subject to two kinds of velocity slippage: one due to rarefaction effects and the other to porous effects. Using this model, a rarefaction-modified Reynolds equation is derived considering the permeability of the running surface. Then, this equation is applied to lubrication of a magnetic head slider flying over a magnetic medium. It is found that there exists an interesting condition wherein total apparent slippage seems to disappear due to the cancellation of the two slippages, and that permeability effects are larger for a slider having a steeper pressure gradient.
1996-03-25