Elucidation of the mechanistic factors of radiation heat transfer on the viscous-type unstable natural convective boundary layer transition

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K14099
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 19020:Thermal engineering-related
• Research Institution: Hachinohe National College of Technology
• Principal Investigator: Kogawa Takuma 八戸工業高等専門学校, その他部局等, 准教授 (80818518)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 自然対流境界層 / T-S波 / 変曲点不安定 / 粘性型不安定 / 擾乱方程式 / LES

Outline of Final Research Achievements

Three-dimensional heat transfer analysis using LES reveals that the instability of the spatially evolving natural convection boundary layer can be controlled by controlling the velocity distribution in the transition zone by radiave heat transfer. Numerical analysis using the disturbance equation suggests that the natural convection boundary layer is caused by an inflection point-type instability. It is concluded that in a spatially evolving natural convection boundary layer, the inflection point instability of the boundary layer can be controlled by radiative heat transfer, and that the instability can be modified by the radiative heat flux in the boundary layer.

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Free Research Field

熱工学

Academic Significance and Societal Importance of the Research Achievements

本研究結果は自然対流境界層の不安定メカニズムに対して新しい知見をもたらす．また，ふく射伝熱を応用した新しい境界層制御技術の創成にも繋がり，本研究結果の意義は大きいと考える．