EXPERIMENTAL STUDY OF THE FLOW IN A SIMULATED HARD DISK DRIVE
EXPERIMENTAL STUDY OF THE FLOW IN A SIMULATED HARD DISK DRIVE
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模拟硬盘驱动器中的流程实验研究
DOI：
10.1115/1.2236135
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
E. Maslen
中科院分区：
文献类型：
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作者：
C. Barbier;J. Humphrey;E. Maslen
利用粒子图像测速技术，在一台模拟硬盘驱动器（HDD）的同转盘装置上，测量了流过一对对称的悬挂/滑动单元（SSU）的空气的瞬时周向和径向速度分量。相对于标称312英寸HDD的几何尺寸，设备测试部分中的部件的几何尺寸按比例放大约两倍。大多数测量是在两个角度方向的臂/SSU的椎间盘中间平面上获得的：（a）一个是SSU的尖端靠近支撑椎间盘的轮毂;（B）另一个是SSU的尖端靠近椎间盘的边缘。对从250到3000 rpm（大约相当于312英寸HDD中的1250到15,000 rpm）的磁盘旋转速度范围内获得的数据进行后处理，以产生两个速度分量的平均值和均方根值以及相关的剪切应力、平均轴向涡度和湍流强度（基于两个速度分量）。在臂/SSU附近的位置进行调查，并为磁盘旋转速度大于1500转/分，平均速度分量被发现是渐近独立的磁盘旋转速度，但其均方根值似乎仍然在变化。分别在臂/SSU上游的两个位置90度和29度处，接近该障碍物的气流显示出可归因于障碍物产生的三维尾流的特征。此外，在这两个位置之间并且取决于臂/SSU的角度取向，障碍物的效果是在毂附近引起流动反向的三维区域。尽管如此，臂/SSU上游和下游的流动特性似乎是由局部流动-结构相互作用决定的。除了其内在的基本价值，数据用于指导和测试湍流模型和数值计算程序的发展，用于预测这类复杂的受限旋转流，并为HDD的改进设计提供信息。
Instantaneous circumferential and radial velocity components of the air flowing past a symmetrical pair of suspension/slider-units (SSUs) attached to an E-Block/arm were measured in a specially designed corotating disk apparatus simulating a hard disk drive (HDD) using the particle image velocimetry technique. The geometrical dimensions of the components in the apparatus test section were scaled up by a factor of two, approximately, relative to those of a nominal 312 inch HDD. Most of the measurements were obtained on the interdisk midplane for two angular orientations of the arm/SSUs: (a) One with the tip of the SSUs near the hub supporting the disks; (b) another with the tip of the SSUs near the rims of the disks. Data obtained for disk rotational speeds ranging from 250 to 3000rpm (corresponding to 1250 to 15,000rpm, approximately, in a 312 inch HDD) were post-processed to yield mean and rms values of the two velocity components and of the associated shear stress, the mean axial vorticity, and the turbulence intensity (based on the two velocity components). At the locations investigated near the arm/SSUs, and for disk rotational speeds larger than 1500rpm, the mean velocity components are found to be asymptotically independent of disk speed of rotation but their rms values appear to still be changing. At two locations 90 and 29deg, respectively, upstream of the arm/SSUs, the flow approaching this obstruction displays features that can be attributed to the three-dimensional wake generated by the obstruction. Also, between these two locations and depending on the angular orientation of the arm/SSUs, the effect of the obstruction is to induce a three-dimensional region of flow reversal adjacent to the hub. Notwithstanding, the characteristics of the flow immediately upstream and downstream of the arm/SSUs appear to be determined by local flow-structure interactions. Aside from their intrinsic fundamental value, the data serve to guide and test the development of turbulence models and numerical calculation procedures for predicting this complex class of confined rotating flows, and to inform the improved design of HDDs.