Al<sub>2</sub>O<sub>3</sub>纳米流体自激式脉动传热的热流道结构优选

袁红梅; 汪朝晖

doi:10.13433/j.cnki.1003-8728.20200537

Al₂O₃纳米流体自激式脉动传热的热流道结构优选

doi: 10.13433/j.cnki.1003-8728.20200537

袁红梅^{1, 2,},
汪朝晖^{1, 2, ,}

1.
武汉科技大学冶金装备及其控制教育部重点实验室，武汉　430081
2.
武汉科技大学机械传动与制造工程湖北省重点实验室，武汉　430081

基金项目: 国家自然科学基金项目（51875419）

详细信息

作者简介:
袁红梅（1994−），硕士研究生，研究方向为脉动纳米流体强制对流传热，hmyuan314@163.com

通讯作者:
汪朝晖，教授，博士生导师，博士， wustzhwang@163.com

中图分类号: D480.99
计量
- 文章访问数: 100
- HTML全文浏览量: 47
- PDF下载量: 10
- 被引次数: 0
出版历程
- 收稿日期: 2021-01-10
- 刊出日期: 2023-02-04

Optimization of Hot Runner Structure for Self-excitedPulsating Heat Transfer of Al₂O₃ Nanofluid

YUAN Hongmei^{1, 2
,},
WANG Zhaohui^{1, 2
, ,}

1.
Key Laboratory of Metallurgical Equipment and Control Technology of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China
2.
Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering, Wuhan University of Science and Technology, Wuhan 430081, China

摘要

摘要: 在对流传热过程中，如何增加边界扰动以改善传热性能，是实现强化传热的关键问题。基于自激振荡腔的脉动效应和纳米流体的高热导率，提出了一种纳米流体无源脉动强化传热机制。采用正交数值试验方法对自激振荡热流道的主要结构参数进行优化研究，利用大涡模拟湍流模型分析了热流道的结构参数对Al₂O₃纳米流体传热特性的影响规律，并获得了最优结构参数配比。结果表明：腔室长度对热流道中纳米流体的传热性能影响最大，腔室直径影响最小，并观察到无量纲参数L/d₁=7、D/d₁=11、d₂/d₀=1.1的自激振荡热流道具有最佳传热性能。
- 自激振荡腔 /
- 纳米流体 /
- 脉动强化传热 /
- 正交数值试验 /
- 结构优选
Abstract: In the process of convective heat transfer, how to increase the boundary disturbance to improve the heat transfer performance is the key issue to realize the enhancement of heat transfer. Based on the pulsation effect of the self-excited oscillation chamber and the high thermal conductivity of the nanofluid, a passive pulsation enhanced heat transfer mechanism of the nanofluid is proposed in this study. The orthogonal numerical experiment method was used to optimize the main structural parameters of the self-excited oscillation hot runner. The large eddy simulation turbulence model was used to analyze the influence of the hot runner structural parameters on the heat transfer characteristics of the Al₂O₃ nanofluid, and the optimal structural parameter ratio was obtained. The orthogonal numerical experiment results show that the length of the chamber has the greatest effect on the heat transfer performance of the nanofluid in the hot runner, and the diameter of the chamber has the least effect. It is also observed that the self-excited oscillating hot runner has the best heat transfer performance when dimensionless parameters L/d₁=7, D/d₁=11 and d₂/d₀=1.1.
- self-excited oscillation chamber /
- nanofluid /
- pulsation enhanced heat transfer /
- orthogonal numerical experiment /
- structural optimization

HTML全文

图 1 自激振荡热流道结构示意图

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图 2 自激振荡热流道涡流分布示意图

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图 3 不同网格尺寸下腔室中心线的时均速度

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图 4 一个脉动周期内热流道中的涡量分布

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图 5 壁面温度沿轴向位置的变化情况

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图 6 壁面努塞尔数沿轴向位置的变化情况

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表 1 自激振荡热流道初始结构参数

结构参数	尺寸
上流道入口直径d₀/mm	12
上流道入口长度l₀/mm	15
上流道出口直径d₁/mm	6
上流道出口长度l₁/mm	5
下流道直径d₂	d₀
下流道长度l₂/mm	150
腔室直径D	10d₁
腔室长度L	6d₁
收敛角α/（º）	14
碰撞角θ/（º）	120

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表 2 Al₂O₃纳米颗粒和水的热物理性质

物性参数	Al₂O₃	水
ρ/（kg·m⁻³）	3 880	998.2
C_p/（J·（kg·K）⁻¹）	773	4 182
μ_nf/（Pa·s）	−	9.98×10⁻⁴
k/（W·（m·K）⁻¹）	36	0.597

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表 3 热流道主要结构参数因素-水平表

因素水平	A	B	C
1	10	4	0.8
2	11	5	0.9
3	12	6	1.0
4	13	7	1.1

下载: 导出CSV

表 4 正交数值试验方案及试验结果表

编号	A	B	空列	C	空列	组合	Nu_av
1	10	4	0.8	0.8	0.8	A₁B₁C₁	340.8789
2	10	5	0.9	0.9	0.9	A₁B₂C₂	451.6409
3	10	6	1.0	1.0	1.0	A₁B₃C₃	543.8952
4	10	7	1.1	1.1	1.1	A₁B₄C₄	592.7202
5	11	4	1.0	0.9	1.1	A₂B₁C₂	392.9558
6	11	5	1.1	0.8	1.0	A₂B₂C₁	426.2260
7	11	6	0.8	1.1	0.9	A₂B₃C₄	596.9104
8	11	7	0.9	1.0	0.8	A₂B₄C₃	559.9789
9	12	4	1.1	1.0	0.9	A₃B₁C₃	421.1068
10	12	5	1.0	1.1	0.8	A₃B₂C₄	505.6841
11	12	6	0.9	0.8	1.1	A₃B₃C₁	525.4945
12	12	7	0.8	0.9	1.0	A₃B₄C₂	616.7067
13	13	4	0.9	1.1	1.0	A₄B₁C₄	432.8087
14	13	5	0.8	1.0	1.1	A₄B₂C₃	475.6208
15	13	6	1.1	0.9	0.8	A₄B₃C₂	480.7732
16	13	7	1.0	0.8	0.9	A₄B₄C₁	633.8898
k₁	482.2838	396.9375	507.5292	481.6223	471.8288	T_in= 293.15 K T_wall= 343.15 K Re_in= 40000
k₂	494.0178	464.7929	492.4808	485.5191	525.8870
k₃	517.2480	536.7684	519.1062	500.1504	504.9091
k₄	505.7731	600.8239	480.2066	532.0309	496.6978
R	34.9642	203.8864	38.8997	50.4086	54.0582

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表 5 方差分析表

方差来源	平方和	自由度	F	显著性
A	2721.43	3	0.574	Δ
B	93514.66	3	19.741	***
C	6293.28	3	1.328	*
e	9474.33	6	−	−
总和	112003.69	15	−	−
注：Δ不显著；显著；较显著；**高度显著。

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