Investigation of a computer CPU heat sink under laminar forced convection using a structural stability method
Investigation of a computer CPU heat sink under laminar forced convection using a structural stability method
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DOI：
10.1016/j.ijheatmasstransfer.2019.02.029
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发表时间：
2019-05-01
影响因子：
5.2
通讯作者：
Truong Khang Nguyen
中科院分区：
文献类型：
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作者：
Moradikazerouni, Alireza;Afrand, Masoud;Truong Khang Nguyen
在本研究中，使用三维分析模型研究了风冷平板散热器在强制对流情况下的热性能。为了验证当前模型，将该解决方案与一致的数值和实验结果进行了比较。这项研究研究了散热器热性能和环境参数对散热器抗热应力稳定性的影响，这对于制造商的目标至关重要。研究了影响散热器表面传热率的有效参数。研究了不同气流速度下的雷诺数和努塞尔数、传热系数、翅片高度和翅片数量。此外，还研究了热应力（结构稳定性法）。气流速度的增大导致努塞尔数值倾斜，从而增加传热系数。将雷诺数从 3.80*10(3) 增加到 2.28*10(4) 可使热应力减少 47.36%，变形减少 50%，表面温度减少 28.57%，从而减少几何故障。结果表明，与对流辐射传热相比，纯对流传热量减少了1.66%，增加翅片数量和翅片高度可分别降低表面温度25%和20%。因此，所选择的雷诺数范围完全适合这种不允许热应力使散热器的翅片变形的高温设备。 (C) 2019 Elsevier Ltd. 保留所有权利。
In the present study, the thermal performance of an air-cooled, flat-plate heat sink in forced convection was performed using a three-dimensional analytical model. To validate the present model, this solution is compared with numerical and experimental results that agree. This research studies the influence of heat sink thermal performance and of environmental parameters on the heat sink's stability against thermal stress, which is essential for manufacturers' goals. The effective parameters on heat transfer rate from the surface of heat sink were investigated. Reynolds and Nusselt numbers, heat transfer coefficient, fins height, and fins number were studied under various air flow velocities. In addition, the thermal stress (structural stability method) was investigated. Enhancement of the airflow velocity caused the Nusselt number value to incline, which increases the heat transfer coefficient. Increasing the Reynolds number from 3.80*10(3) to 2.28*10(4) leads to less thermal stress by 47.36%, less deformation by 50%, less surface temperature by 28.57%, and, consequently, less geometry failure. Results depicted that pure convection has less heat transfer by 1.66% compared with convection-radiation heat transfer, and enhancing the fins number and fins height reduces the surface temperature by 25% and 20%, respectively. As a result, the chosen range of the Reynolds number is totally suitable for this high-temperature device that does not allow thermal stress to deform the fins of the heat sink. (C) 2019 Elsevier Ltd. All rights reserved.