Abstract
Lubricant transfer and distribution at the head/disk interface in air-helium gas mixtures is investigated using a developed model that combines an air-bearing model with a molecular dynamics model. The pressure distribution is calculated by the air-bearing model at the head/disk interface with respect to the helium content and the pressure obtained is then input to the molecular dynamics model to understand the lubricant transfer mechanism. Finally, the effects of pressure at the boundary condition and disk velocity on lubricant transfer are discussed in relation to the helium fraction within the air-helium gas mixtures. Results show there is a decrease in the pressure difference with an increase in the helium percentage, which leads to a decrease in the volume of the lubricant transferred. The results also suggest that the lubricant is not easily to transfer in gas mixtures with a high percentage of helium, even when both higher disk velocities and pressure boundary conditions are applied.
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Acknowledgement
This work was supported by the National Natural Science Foundation of China (51505093, 51605113), the Young Talents Project of Education Department of Guizhou Province (KY[2016]116), the Science and Technology Project of Guizhou Province ([2016]1035), and the Science and Technology Innovation Project for Overseas Scholars of Guizhou Province.
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Zhengqiang TANG. He recived his Ph.D degree in mechanical engineering from South China University of Technology in 2014. He was a visiting graduate student at University of California, San Diego from 2011 to 2013. He is an associate professor at School of Mechanical Engineering, Guizhou University. He has authored or co-authored more than 10 journal papers. His research interests are friction and lubrication at the head/disk interface and fretting wear.
Dongdong ZHOU. He recived his bachelor degree in mechanical engineering from Guizhou University, China, in 2016. Now, he is a graduate student in Guizhou University, and his research work includes friction and lubrication characteristics at the head/disk interface.
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Tang, Z., Zhou, D., Jia, T. et al. Investigation of lubricant transfer and distribution at head/disk interface in air-helium gas mixtures. Friction 7, 564–571 (2019). https://doi.org/10.1007/s40544-018-0233-7
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DOI: https://doi.org/10.1007/s40544-018-0233-7