MIPEベストプレゼンテーション賞（芝浦工業大学　Ibrahim Abubakar Masud氏）

芝浦工業大学

Ibrahim Abubakar Masud

I am honoured to receive the MIPE 2025 Best Paper Award at the recently concluded INTERPACK Conference in California, USA. This recognition is both an honour and a strong motivation for our research group under the supervision of Prof. Katsuaki Shirai. I would like to express my sincere appreciation for his invaluable guidance and support in the realization of this work.

The work focuses on the fluid flow in a model hard disk drive (HDD) widely used for information storage. In this study, we developed a non-axisymmetric corotating model HDD featuring an inserted arm and a partial shroud opening, in contrast to conventional axisymmetric configurations. A two-dimensional, two-component particle image velocimetry (2D2C PIV) technique was employed to measure and analyse the flow fields.

The objective is to enhance the development of non-axisymmetric disk-driven flow models, such as those found in HDDs. In HDDs, flow-induced mechanical vibrations in the head flying height can increase the risk of read/write errors, thereby limiting further advancements in recording density. Since simplified models provide a fundamental benchmark for understanding disk-driven flows in corotating systems, this research aims to establish a spatial classification of flow regions along the streamwise direction of an inserted obstruction.

The results revealed the presence of secondary flows both upstream and downstream of the inserted obstruction within the inter-disk planes like axisymmetric case. Additionally, solid-body rotation was observed around the hub, with its extent of development depending on the insertion angle of the arm. Based on the flow behaviour, a spatial classification of flow regimes along the streamwise direction was established, providing insights that can contribute to the enhancement of corotating system designs.

The findings are expected to contribute more broadly to understanding and improving the performance of fluid machinery involving rotation. Future research is anticipated to further elucidate these unsteady and complex flow structures through a combination of experimental investigation and numerical analysis