| 倾斜角度对基于相变材料的散热器在脉冲式热负荷作用下瞬时性能的影响 |
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| 作者姓名： | Jiang LU ;Li-wu FAN ;Yi ZENG ;Yu-qi XIAO ;Xu XU ;Zi-tao YU |
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| 作者单位： | [1]School of Civil Engineering and Architecture, Zhejiang University of Science and Technology, Hangzhou 310023, China; [2]Department of Energy Engineering, Zhejiang University, Hangzhou 310027, China; [3]Department of Mechanical Engineering, Auburn University, Auburn 36849, USA; [4]School of Metrological and Measurement Engineering, China Jiliang University, Hangzhou 310018, China |
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| 基金项目： | Project supported by the National Natural Science Foundation of China(No.51276159) |
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| 摘 要： | 研究目的：通过实验方法定量研究在相变材料较为剧烈的熔化传热过程中散热器倾斜角度的改变对其瞬时性能所产生的影响。创新要点：定量研究在倾斜角度从水平到垂直时,储能式散热器在脉冲式热负荷作用下瞬时性能的变化规律,并在所研究的工况范围内给出了最优的倾斜角度参考值。研究方法：采用电加热方法模拟电子器件所产生的热源,通过调节电压改变脉冲式热负荷的强度和作用时间,并根据热电偶测量所得的加热表面温度变化来表征储能式散热器的瞬时性能。重要结论：在一定的倾斜角度下工作,可以有效提升基于相变材料的储能式散热器的瞬时性能。在加热功率为40 W、以75℃为目标时,其有效保护时间的相对增长可达约67%。
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| 关 键 词： | 散热器 倾斜角 相变材料 储热 热管理 |
Effect of the inclination angle on the transient performance of a phase change material-based heat sink under pulsed heat loads |
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| Jiang LU,;Li-wu FAN,;Yi ZENG,;Yu-qi XIAO,;Xu XU,;Zi-tao YU.Effect of the inclination angle on the transient performance of a phase change material-based heat sink under pulsed heat loads[J].Journal of Zhejiang University Science,2014(10):789-797. |
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| Authors: | Jiang LU Li-wu FAN Yi ZENG Yu-qi XIAO Xu XU Zi-tao YU |
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| Abstract: | The transient performance of a phase change material（PCM）-based heat sink may be affected by its inclination angle because natural convection usually occurs and dominates melting during the operation of the heat sink. An experimental setup was designed and used in this study that allows for the alternation of the inclination angle of the heat sink. The inclination angle was varied from 0° to 90° at increments of 15°, while two pulsed heat loads（20 and 40 W） were adopted. 1-hexadecanol of a nominal melting temperature of 49 ？C was selected as the PCM. The transient performance of the heat sink was characterized by the temperature variations at the center of the heat spreader under various conditions. The results showed that the transient performance of the heat sink is able to be improved by simply increasing its inclination angle which then facilitates the natural convection during melting. However, the variation in the performance is not a monotonous function of the inclination angle. Although the time-averaged thermal resistances of the heat sink were shown to be only marginally lowered, the maximum operation times may be greatly extended under the given thermal conditions. For a heat load of 40 W and the maximum allowable temperature of 75 °C, the operation time of the heat sink is extended by up to nearly 67% at an inclination angle of 75° when compared to that of the horizontal case. Based on the cases tested, the optimal inclination angle was found to lie between 60° and 75°. |
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| Keywords: | Heat sink Inclination angle Melting Natural convection Phase change material（PCM） Thermal energy storage Thermal management |
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