Effect of the cross-sectional shape of the recirculation channel on expulsion of air bubbles from FDBs used in HDD spindle motors

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• 作者：Yeonha Jung ; Gunhee Jang ; Chiho Kang ; Hyunho Shin…
• 刊名：Microsystem Technologies
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：21
• 期：12
• 页码：2747-2759
• 全文大小：3,833 KB
• 参考文献：Asada T, Saito H, Asaida Y, Itoh K (2002) Design of hydrodynamic bearings for high-speed HDD. Microsyst Technol 8:220-26CrossRef
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  Bahrami M, Yovanovich M, Culham J (2007) A novel solution for pressure drop in singly connected microchannels of arbitrary cross-section. Int J Heat Mass Transf 50:2492-502MATH CrossRef
  FLUENT 6.3 User’s Guide (2006)
  Jung KM, Jung YH, Lee JH, Jang HK, Jang GH (2013) Motions of air bubbles trapped in grooved and plane journal bearings of operating fluid dynamic bearings. IEEE Trans Magn 49:2433-436CrossRef
  Metz T, Paust N, Zengerle R (2010) Capillary driven movement of gas bubbles in tapered structures. Microfluid Nanofluid 9(2-):341-55CrossRef
  
• 作者单位：Yeonha Jung (1)
  Gunhee Jang (1)
  Chiho Kang (1)
  Hyunho Shin (2)
  Jongyeop Jeong (2)
  
  1. Department of Mechanical Engineering, Hanyang University, 17 Haengdang-Dong, Seongdong-Gu, Seoul, 133-791, Korea
  2. Samsung Electro-Mechanics Co. Ltd., 314, Maetan 3-Dong, Yeongtong-Gu, Suwon-Si, Gyeonggi-Do, 443-743, Korea
  
• 刊物类别：Engineering
• 刊物主题：Electronics, Microelectronics and Instrumentation
  Nanotechnology
  Mechanical Engineering
  Operating Procedures and Materials Treatment
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1858

文摘

This paper experimentally and numerically investigated the behavior of air bubbles in the oil lubricant of operating fluid dynamic bearings (FDBs) with a cross-sectional recirculation channel (RC). Experiments were performed to visually observe the behavior of trapped air bubbles in operating FDBs with crescent and circular cross-sectional RCs, respectively. Furthermore, a numerical study was carried out to investigate the phenomenon of air bubble expulsion from the FDB. The flow field of a FDB was calculated by the Navier–Stokes equation, continuity equation and volume of fluid (VOF) method. Results indicated that a crescent cross-sectional RC generates a larger pressure difference between the upper and lower regions of the RC and a faster flow velocity along the RC than a circular cross-sectional RC, because the former has larger wall shear stress than the latter, mainly due to a longer perimeter. Finally, we designed a novel RC that efficiently expels air bubbles.