Flow control by surface manipulation

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K03861
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 19010:Fluid engineering-related
• Research Institution: Tokyo Metropolitan University
• Principal Investigator: Inasawa Ayumu 東京都立大学, システムデザイン研究科, 准教授 (70404936)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 流体工学 / 流れの制御 / 表面操作 / 熱対流 / 流れの不安定性

Outline of Final Research Achievements

In this study, natural convection in horizontal slots with small-amplitude surface corrugation was examined experimentally and theoretically. When surface corrugation was applied to either wall, convection rolls whose wavelength was the same as that of the corrugation was generated at subcritical Rayleigh numbers. On the other hand, at supercritical condition, the Rayleigh-Benard convection dominates the flow, regardless of the wall wavelength. Convection is further enhanced when surface corrugation was applied to both walls, and the convection pattern changes with wall phase difference. Experimental results were in good agreement with the analysis, verifying the validity of the theoretical model.

Free Research Field

流体力学

Academic Significance and Societal Importance of the Research Achievements

表面条件のわずかな操作による流れ場の応答を実験および理論から示したことは，熱と運動量の輸送現象の基礎資料になるだけでなく，流路中に機械的・電気的なアクチュエータを必要としない，効果的かつ効率的な受動的流体制御手法の開発につながる意義のある成果である．