Development of a new flow control methodology using periodic wall heating

2020 Fiscal Year Final Research Report

• Project/Area Number: 18K03952
• 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): 2018-04-01 – 2021-03-31
• Keywords: 対流 / 流れの制御 / 熱流体 / 抵抗低減 / 流れの駆動

Outline of Final Research Achievements

Flows in a channel with distributed surface heating were examined experimentally. When the heating was applied to a smooth surface, a pair of steady rolls was formed for Rap<3500, leading to skin-friction drag-reduction of at most 8% for Re < 20. In addition, when the heating was applied to corrugated wall with proper phase difference, the net horizontal flow was created whose volumetric flow rate increased monotonically with the heating intensity. The agreement between the experimental and theoretical results verified the flow was surely controlled by using distributed surface heating.

Free Research Field

流体力学

Academic Significance and Societal Importance of the Research Achievements

従来，流れの制御は壁面形状の微細加工やアクチュエータなどのデバイスを用いて行われてきた．これに対し，本研究では，壁面外側からの加熱・冷却により生じる自然対流を利用した新たな流れの制御法について，周期温度分布の実現方法とともに，実験的に調べ，抵抗低減と水平流の駆動制御が可能であることを実証した．この制御法は特に，デバイスの設置が困難な，微小流路内の抵抗低減や流れの駆動（すなわち圧力損失の低減）に適用でき，流れの制御の新たな可能性を切り拓く．