타원형 실린더의 각도 변화가 사각 밀폐계 내부의 자연대류 현상에 미치는 영향

• Published in: 설비공학 논문집, 30(2) Vol. 30; no. 2; pp. 58 - 67
• Main Authors: 손용진(Yong Jin Son), 하만영(Man Yeong Ha)
• Format: Journal Article
• Language: Korean
• Published: 대한설비공학회 2018
• Subjects: 기계공학; Elliptic cylinder(타원형 실린더); Immersed Boundary Method(가상 경계법); Natural convection(자연 대류); Angle of cylinder(실린더 각도)
• ISSN: 1229-6422; 2465-7611
• DOI: 10.6110/KJACR.2018.30.2.058

This study investigated the effect of variation in the angle of the elliptic cylinder as well as the presence of circular cylinder on natural convection inside a square enclosure. The Rayleigh number was varied between $10^3$ and $10^6$, and the Prandtl number was fixed to 0.7. In the present study, the angle of the elliptic cylinder was changed from $0^{\circ}$ to $90^{\circ}$, and the perimeter of the elliptic cylinder was same as that of the circular cylinder. The immersed boundary method was used to capture the virtual wall boundary of the inner cylinder. With the increasing angle of the elliptic cylinder, the surface-averaged Nusselt numbers on the cylinder and the enclosure increased. In the Rayleigh number range considered in the present study, the surface-averaged Nusselt number on the elliptic cylinder over = $45^{\circ}$ was higher than that of the circular cylinder. The effect of elliptic cylinder's angle on natural convection in the enclosure was analyzed according to the flow and thermal fields, and the distributions of the Nusselt number.