Two-dimensional topology analysis on the complex flow driven by corotating disks mounted in a non-axisymmetric enclosure

Sakamoto, Mizuki; Shirai, Katsuaki

doi:10.1007/s00542-023-05575-x

Cited by 1 publication

(1 citation statement)

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“…The uniqueness of our study lies in the novel model of a transparent HDD constructed from polymethyl methacrylate (PMMA), utilising an aqueous solution of ammonium thiocyanate (NH4SCN) as the working fluid and polyamide resin as the tracer particles. This construction enables the observation of the flow behaviour across all regions through Refractive Index Matching (RIM), eliminating the negative impacts of reflections and refractions (Sakamoto and Shirai, 2023). This approach offers advantages of both qualitative and quantitative measurements.…”

Section: Introductionmentioning

confidence: 99%

Comparative study on the complex behaviour of flow fields in a transparent non-axisymmetric corotating system between two arm-insertion angles at two measurement planes in an enclosure

MASUD,

SAKAMOTO,

UENO

et al. 2024

JFST

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Flow driven by co-rotating disks, such as hard disk drives (HDD) have been studied in previous research using axisymmetric models. In our work, a unique non-axisymmetric 3.5" transparent HDD model for information storage was used to investigate the effect of the arm insertion angle on these flow-fields. After introducing the shroud opening region in our model, we focused and illustrated the nature of flow-fields at a parameter α , defined as the arm insertion angle. Comparison was made between α = 20° closer to the shroud opening and a deeper angle of α = 44° closer to the hub. We revealed the flow pattern at the disk-to-disk middle plane (midplane) as well as between the arm and the upper disk boundary layer (arm-upper disk plane) across the disk region from the edge of the hub to the edge of the disk, using both flow visualisation and particle image velocimetry (PIV). The visualisation results revealed an accelerated flow around the hub downstream of the arm insertion, with a higher magnitude at α = 44° compared to α = 20°. We observed a rigid body rotation around the hub for both insertion angles.

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Section: Introductionmentioning

confidence: 99%