Apparatus for Measuring Reflection Coefficients in Lubrication at Moderate Knudsen Number
Original Publication Date: 1985-Mar-01
Included in the Prior Art Database: 2005-Feb-18
Slider bearings for read-write heads glide low enough for the lubricating air to undergo partial slip at the bearing and driving surfaces. The degree of slip, which influences the gliding characteristics, depends on the molecular reflection coefficients at the boundaries. All theory and design to date assumes the same coefficient at both boundaries. With liquid-coated discs, however, this may not be valid. It has been shown that non-equal coefficients lead to a novel term in the Reynolds equation, which involves the difference of the boundary lateral velocities rather than their sum. Hence, a difference in coefficients can be measured by a device which produces only this forcing term in the Reynolds equation.