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A model for liquid transfer between two approaching gas bearing surfaces through coupled evaporation-condensation and migration dynamics

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1 Author(s)
Wu, Lin ; Department of Mechanical Engineering, University of Nebraska-Lincoln, Nebraska 68588, USA

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A model for transfer of liquid coated on one surface to another approaching surface through evaporation-condensation has been constructed for a gas bearing system. The evaporation-condensation process is dynamically coupled to the migration of already condensed liquid film. An equation based on mass transport principle is derived to calculate the partial vapor phase pressure distribution of evaporated liquid material within the sandwiched gas bearing layer. The controlling parameters in the evaporation-condensation and migration dynamics are identified to be the electric potential difference between the surfaces, liquid molecular weight, disjoining pressure, air shearing stresses, thickness of liquid film coated on one wall, and the wall-to-wall separation. Application of the model to the study of disk-to-slider lubricant transfer in a hard disk drive system shows very rich nonlinear dynamics of the coupled evaporation-condensation and migration of lubricants within the head-disk interface. Disk-slider lubricant bridges are formed when the disk-slider electric potential difference is above a critical value.

Published in:

Journal of Applied Physics  (Volume:104 ,  Issue: 1 )

Date of Publication:

Jul 2008

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