Abstract

The high heat flux from electronic devices such as projectors, LEDs, or high power chips requires effective cooling methods at heat dissipation in a limited space. In the present study, the heat and fluid flow characteristics of isothermally heated objects located in a duct were numerically analyzed in order to investigate cooling of electronic devices. The channel had three objects attached to its bottom wall. The numerical computations were performed by solving two-dimensional steady laminar governing equations using the Fluent 17.0 program. Air moving with uniform velocity was taken as the cooling working fluid in the duct. A triangular arc shaped cross-section part was used as a control element. The top and bottom walls of the duct and the part were adiabatic. The part was located at three different points in the y-direction, and these parameters were tested at three different Reynolds numbers (\(150\le \mathrm{Re} \le 600\)). The results were also compared with a non-triangular arc shaped case. The results show that insertion of a triangular arc shaped cross-section part increased the heat transfer for all the Reynolds numbers and the best heat transfer was observed for the part position with y = 1.75 H.

中文翻译：

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弧形棒对电子设备冷却时的传热和流体特性的影响

摘要

电子设备（如投影仪，LED或大功率芯片）产生的高热通量要求在有限的空间内有效地散热。在本研究中，对位于管道中的等温加热物体的热和流体流动特性进行了数值分析，以研究电子设备的冷却情况。通道的底壁上附着了三个物体。通过使用Fluent 17.0程序求解二维稳态层流控制方程，进行了数值计算。以均匀速度移动的空气被用作管道中的冷却工作流体。三角形的横截面用作控制元件。风管的顶壁和底壁以及该部分是绝热的。零件位于y方向上的三个不同点，\（150 \ le \ mathrm {Re} \ le 600 \））。还将结果与非三角形弧形情况进行了比较。结果表明，插入三角形弧形横截面零件会增加所有雷诺数的传热，并且对于y = 1.75 H的零件位置，观察到最佳的传热。