A numerical study is made of heat transfer in a vertically mounted cup-like cavity that rotates steadily about the longitudinal axis and has the hole in the bottom wall through which fluid passes into and out of. The temperature of the cavity wall($T_w$) is lower than that of the surroundings($T_∞$). The entering fluid temperature is equal to $T_∞$. The relevant non-dimensional parameters are identified. The governing Navier-Stokes equations are solved numerically. The rotational Reynolds number(Re) is large, and the cylinder aspect ratio is O(1). The heat transfer at the bottom and side wall is influenced by the hole size in the bottom wall and the strength of axial through flow. When fluid passes into the hole in the bottom hole, the meridional flow in the cavity becomes more active and heat transfer is enhanced. The flow of passing out of the hole in the bottom at low speed opposes the meridional flow and reduces heat transfer. But if at high speed, inlet flow overpowers the meridional flow and enhances heat transfer. When the fluid passes through the bottom hole with constant fow rate, the heat transfer rate at side wall increases as the size of hole larger. Constant axial Reynolds number test also shows the same results.
일정한 각속도로 돌고 있는 컵모양 용기에서 바닥면을 통한 흡출이나 흡입이 있는 경우에 측벽과 바닥면에서의 Nusselt number를 수치적 방법으로 알아보았다. 특히, 바닥면에서의 구멍의 크기와 그 구멍을 통한 축방향 유동 속도 변화시킴에 따라 용기 내의 열전달 변화 양상을 알아보고 유동장 변화를 통해 물리적 해석을 하였다.
