烧结多孔槽道吸液芯超薄平板热管的传热性能

doi:10.11949/j.issn.0438-1157.20180720

摘要/Abstract

摘要：

设计并制作了总厚度为0.85 mm的超薄平板热管，热管的毛细芯采用烧结多孔槽道结构，实现了槽道和多孔结构的结合，根据该结构制作了一个铝制模具。该热管设计结合了超薄化和易制作的特点，对热管性能测试搭建了实验平台，分析了加热功率、铜粉粒径、槽道数目对热管热性能的影响，热阻和最大传热能力用来表征热管的性能。结果表明在加热功率为14 W时，放置铜板和热管的加热铜块温度分别是102℃和66℃，热管有效降低了热源温度；当铜粉粒径较大时热管的热阻和传热极限也较大，粒径减少时出现相反现象。相比单槽道结构，双槽道结构出现了更低热阻，两者最小差异为21%。

关键词: 超薄平板热管, 烧结, 多孔槽道结构, 传热, 铜粉粒径, 热性能, 实验验证

Abstract:

An ultra-thin plate heat pipe with a total thickness of 0.85 mm was designed and manufactured. The capillary core of the heat pipe adopts a sintered porous channel structure to realize the combination of the channel and the porous structure. According to this structure, an aluminum mold was manufactured. The heat pipe design combines the features of ultra-thin and easy fabrication, and sets up an experimental platform for heat pipe performance testing. The influence of heating power, copper powder particle size, and number of channels on thermal performance were analyzed. Thermal resistance and maximum heat transport capacity were used to characterize the performance of heat pipes. The results show that when the heating power is 14 W, the temperature of the heated copper block with copper plate and heat pipe is 102℃ and 66℃, respectively, and the heat pipe effectively reduces the temperature of the heat source. When the particle size of the copper powder is larger, the thermal resistance and the heat transfer limit of the heat pipe are also larger. When the particle size decreases, the opposite phenomenon occurs. Compared to the single-channel structure, the dual-channel structure has a lower thermal resistance, and the lowest difference is 21%.

Key words: ultra-thin flat heat pipe, sintering, porous channels structure, heat transfer, particle size of copper powder, thermal performance, experimental validation

中图分类号:

TK 124

朱明汉, 白鹏飞, 胡艳鑫, 黄金. 烧结多孔槽道吸液芯超薄平板热管的传热性能[J]. 化工学报, 2019, 70(4): 1349-1357.

Minghan ZHU, Pengfei BAI, Yanxin HU, Jin HUANG. Heat transfer performance of ultra-thin plate heat pipe with sintered porous channels structures wick[J]. CIESC Journal, 2019, 70(4): 1349-1357.

图/表 13

图1 平板热管结构

Fig.1 Flat heat pipe structure

图2 模具和样品

Fig.2 Molds and samples

图3 实验装置原理图

Fig.3 Schematic of experimental testing system

图4 热电偶分布

Fig.4 Distribution of thermocouples

图5 热管在不同功率下的温度分布

Fig.5 Heat pipe temperature distributions under different heat load

图6 铜板在不同功率下的温度分布

Fig.6 Copper plate temperature distributions under different heat load

图7 热管加热功率从1 W至14 W时的动态温度特性

Fig.7 Dynamic temperature characteristics of heat pipe under incremental total heat inputs ranging from 1 W to 14 W

图8 热管和铜板在不同功率下的热阻

Fig.8 Thermal resistance of heap pipe and copper plate under different heat load

表1 毛细芯孔隙率

Table 1 Porosity of wick structure

Wick structure	Porosity/%
copper powder 120—180 μm	39.13
copper powder 75—120 μm	34.56
copper powder 58—75 μm	32.23

图9 铜粉粒径对性能的影响（双槽道）

Fig.9 Copper particle size effect on performance (double channel)

图10 铜粉粒径对性能的影响（单槽道）

Fig.10 Copper particle size effect on performance (single channel)

图11 槽道数对热阻的影响

Fig.11 Effect of number of channels on thermal resistance

图12 两种槽道结构

Fig.12 Schematic diagram of two channel structures

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