基于纳米增强相变材料的铜-水热管传热性能分析

doi:10.11949/0438-1157.20200113

摘要/Abstract

摘要：

基于磁力搅拌和超声振荡处理工艺制备了含有不同质量分数纳米氧化铝颗粒的月桂酸固体悬浮液，并测试其热导率。利用相变材料与普通热管绝热段的耦合方式，通过测量不同加热模式下热管各部分的温度，对热管的性能进行分析。结果表明：月桂酸包裹在热管绝热段周围时，可有效降低蒸发段的温度。加入适量浓度的金属氧化物纳米颗粒后，其导热能力得到强化。热管的冷却性能随着月桂酸中氧化铝纳米颗粒浓度增长，先增长后降低，质量分数1.0%为最佳浓度。相比纯月桂酸与普通热管的耦合模块，加入1.0%的氧化铝颗粒可降低10%的蒸发段温度，降低60%的风机能耗，可在加热期间存储27%的热能。

关键词: 相变材料, 纳米流体, 热管, 月桂酸, 热导率

Abstract:

In this paper, the solid suspension of lauric acid with different mass fraction of nano-alumina particles was prepared based on magnetic stirring and ultrasonic shock processing, and its thermal conductivity was tested. By means of the coupling between phase change material and the adiabatic section of the ordinary heat pipe, the temperature of each part of the heat pipe under different heating modes was measured, and the performance of the heat pipe was analyzed. The results show that when lauric acid is wrapped around the adiabatic section of the heat pipe, the temperature of evaporation section can be effectively reduced. The thermal conductivity of metal oxide nanoparticles was enhanced by adding appropriate concentration of metal oxide nanoparticles. The cooling performance of the heat pipe increased with the concentration of alumina nanoparticles in lauric acid. With the increase of concentration, the effect increased at first and then decreased. The mass fraction was the optimal concentration of 1.0%. Compared with the coupling module of pure lauric acid and ordinary heat pipe, adding 1.0% alumina particles can reduce the evaporation temperature by 10%, reduce the fan energy consumption up to 60%, and store nearly 27% of the input power during heating.

Key words: phase change material, nanofluids, heat pipe, lauric acid, thermal conductivity

中图分类号:

TK 172.4

田东民, 吴延鹏, 陈凤君. 基于纳米增强相变材料的铜-水热管传热性能分析[J]. 化工学报, 2020, 71(S1): 220-226.

Dongmin TIAN, Yanpeng WU, Fengjun CHEN. Analysis of heat transfer performance of copper-water heat pipe based on nano enhanced-PCM[J]. CIESC Journal, 2020, 71(S1): 220-226.

图/表 7

图1 PCM热管模块热性能的实验装置示意图和实物图

Fig.1 Schematic diagram and photos of experimental set-up for thermal performance of PCM heat pipe module

图2 不同粒子浓度下月桂酸的热导率

Fig.2 Thermal conductivity of lauric acid under different particle concentrations

图3 不同粒子浓度下热管模块蒸发段温度瞬态响应

Fig.3 Transient temperature curves of evaporator with different particle mass fraction

图4 不同储能物质蒸发段温度瞬态响应

Fig.4 Transient temperature curves of evaporator with different energy storage material

图5 热管模块各部分温度

Fig.5 Temperature curves of each part of heat pipe

图6 不同风扇电压下热管蒸发段温度曲线

Fig.6 Temperature curves of evaporator with different voltage cooling fans

表1 不同功率输入下相变材料中存储的能量

Table 1 Thermal energy storage in PCM with different input powers

功率输入/W	能量/W
功率输入/W	水	纯月桂酸	0.5% Al₂O₃	1.0% Al₂O₃	1.5% Al₂O₃
16	4.52	3.92	4.61	4.67	4.21
20	4.62	3.99	4.82	4.91	4.58

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