LESによる多重配置した小型軸流ファンの冷却性能に関する評価

抄録

Since a fan cooling for electronic devices is conventionally used, it is important to understand the flow phenomena to improve cooling performance. In this study, we investigate the heat-flow characteristics of around two small-axial fans under the influence of varied the distance between centers of two fans and the distance between the fans and the heating plate using LES (large eddy simulation). An IB (Immersed Boundary) method is introduced to reproduce the impingement wall, small-axial fans and casings. We analyze the unsteady flow and heat transfer in a wake of the fans. As a result, we obtain the following findings: when the distance between the centers of the fans is large, a blow-up flow is formed due to the interference of the flows generated by each fan, and the heat transfer performance is low just below this blow-up flow; when the distance between the fan centers is narrow, no blow flow occurs, and the area with high heat transfer performance shows a large-scale asymmetrical distribution; when the distance between the fan and the heating plate is reduced, the peak value of the Nu number increases and the distribution of the peak value is distributed in a narrow range.