多喷嘴喷雾冷却表面传热特性实验研究

doi:10.11949/0438-1157.20231114

摘要/Abstract

摘要：

低沸点制冷剂（R134a）喷雾冷却能快速降低表面温度，在高性能芯片等电子设备热管理、生物医学中均具有广泛应用，可实现喷雾表面的低温高效散热。多喷嘴喷雾冷却可实现较大冷却表面的均匀冷却及冷量的灵活调控。搭建了制冷剂喷雾冷却实验台，研究了多喷嘴喷雾冷却表面传热特性，并分析了喷嘴的孔径、间距、高度、喷雾时间和喷雾压力等因素对多喷嘴喷雾冷却表面传热特性的影响。结果表明：喷嘴孔径对冷却均匀性影响最大，其次是喷嘴间距，适当的喷嘴孔径（0.4 mm）和间距（11 mm）能使制冷剂喷雾在表面合理分布，最低温T_min能达到最小值；10 mm喷嘴高度和1.2 MPa喷雾压力可以使液滴充分雾化并延长有效冷却时间。

关键词: 喷雾冷却, 瞬态传热, 电子热管理, R134a

Abstract:

Low boiling refrigerant (R134a) spray cooling can rapidly reduce the surface temperature. It is widely used in the thermal management of electronic equipment such as high-performance chips and biomedicine, and can achieve low temperature and efficient heat dissipation on the spray surface. Multi nozzle spray cooling can realize uniform cooling of large cooling surface and flexible control of cooling capacity. A refrigerant spray cooling test rig was set up to study the heat transfer characteristics of multi nozzle spray cooling on the surface, and to analyze the effects of nozzle outlet aperture, nozzle height, spray time and spray back pressure on the heat transfer characteristics of multi nozzle spray cooling surface. The results show that the nozzle aperture has the greatest influence on the cooling uniformity, followed by the nozzle spacing. Appropriate nozzle aperture (0.4 mm) and spacing (11 mm) can make the refrigerant spray reasonably distributed on the surface, and the lowest temperature T_min can reach the minimum value. 10 mm nozzle height and 1.2 MPa spray pressure can make the droplets fully atomized and extend the effective cooling time.

Key words: spray cooling, transient heat transfer, electronic thermal management, R134a

中图分类号:

TK 124

李晓阳, 李东, 陶明磊, 周致富, 张灵怡, 苏力争, 张天宁, 李智, 陈斌. 多喷嘴喷雾冷却表面传热特性实验研究[J]. 化工学报, 2024, 75(1): 231-241.

Xiaoyang LI, Dong LI, Minglei TAO, Zhifu ZHOU, Lingyi ZHANG, Lizheng SU, Tianning ZHANG, Zhi LI, Bin CHEN. Experimental study on heat transfer characteristics of multi nozzle spray cooling surface[J]. CIESC Journal, 2024, 75(1): 231-241.

图/表 16

图1 制冷剂喷雾冷却测温实验系统

Fig.1 Experimental system of cryogen spray cooling

图2 多喷孔喷嘴结构示意图

Fig.2 Schematic diagram of multi orifice nozzle

图3 多喷嘴喷雾冷却实验系统温度采集示意图

Fig.3 Schematic diagram of temperature measurement during cryogen spray cooling

表1 不同驱动压力和不同喷雾时间的制冷剂喷射量

Table 1 Refrigerant injection at different drive pressures and spray time

喷雾时间/ms	制冷剂喷射质量/g
喷雾时间/ms	0.6 MPa	1.2 MPa	1.9 MPa
30	0.242	0.410	0.537
50	0.403	0.684	0.895
70	0.564	0.957	1.253

图4 测量误差影响下热流计算值与给定三角波比较

Fig.4 Comparison of the calculated heat flux under the influence of measurement error with a given triangular wave

表2 紫铜、人体皮肤和环氧树脂热物理性质

Table 2 Thermophysical properties of copper， human skin， and epoxy resin

项目

厚度z/mm

热导率

$λ$ /(W/(m·K))

密度

$ρ$ /(kg/m³)

比热容

c_p /(J/(kg·K))

表2 紫铜、人体皮肤和环氧树脂热物理性质

Table 2 Thermophysical properties of copper， human skin， and epoxy resin

项目

厚度z/mm

热导率

$λ$ /(W/(m·K))

密度

$ρ$ /(kg/m³)

比热容

c_p /(J/(kg·K))

紫铜

398

8930

386

人体皮肤

0.05

0.209

1000

3530

环氧树脂

5.0

0.841

1936.96

564.80

图5 多喷嘴喷雾冷却空间雾化效果

Fig.5 Multi nozzle spray cooling atomization

图6 制冷剂喷瞬态雾冷却下喷雾表面不同测点温度变化曲线

Fig.6 Temperature variation of different measuring points on the surface during cryogen spray cooling

图7 喷雾冷却表面瞬态热通量

Fig.7 Transient heat flux on cooling surface

图8 不同喷嘴直径下制冷剂喷瞬态雾冷却下喷雾表面不同测点温度变化曲线

Fig.8 Temperature variation of different measuring points on the surface during cryogen spray cooling with different nozzle diameters

图9 不同喷嘴高度下制冷剂喷瞬态雾冷却下喷雾表面不同测点温度变化曲线

Fig.9 Temperature variation of different measuring points on the surface during cryogen spray cooling at different nozzle heights

图10 不同喷雾时间下制冷剂喷瞬态雾冷却下喷雾表面不同测点温度变化曲线

Fig.10 Temperature variation of different measuring points on the surface during cryogen spray cooling with different spray time

图11 不同喷雾压力下制冷剂喷瞬态雾冷却下喷雾表面不同测点温度变化曲线

Fig.11 Temperature variation of different measuring points on the surface during cryogen spray cooling under different drive pressure

图12 不同喷嘴间距下制冷剂喷瞬态雾冷却下喷雾表面不同测点温度变化曲线

Fig.12 Temperature variation of different measuring points on the spray surface during cryogen spray cooling under different nozzle distances

图13 不同喷雾参数下基板表面各测点最低温度和有效冷却时间统计

Fig.13 Statistics of minimum temperature and effective cooling time of each measuring point on the cooling surface with different spray parameters

表3 不同喷雾参数下基板表面各测点最低温度、表面温差和有效冷却时间统计

Table 3 Statistics of minimum temperature， surface temperature difference and effective cooling time of each measuring point on the substrate surface with different spray parameters

参数	最低温度/°C	温差/°C	冷却时间差/ms
喷嘴孔径
0.2 mm	-32.5	16.6	1554
0.4 mm	-40.4	18.8	505
0.6 mm	-37.5	20.2	318
喷嘴高度
5 mm	-30.4	8.7	563
10 mm	-40.4	18.8	505
15 mm	-37.5	14.1	725
喷雾时间
30 ms	-37.4	17.0	437
50 ms	-40.4	18.8	505
70 ms	-38.8	14.0	567
喷雾压力
0.6 MPa	-36.4	16.1	513
1.2 MPa	-38.0	13.2	608
1.9 MPa	-40.4	18.8	505
喷嘴间距
8 mm	-36.6	7.7	437
11 mm	-40.6	25.3	1021
14 mm	-40.4	18.8	505

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