环肋翅片管相变传热特性及分形优化

王玮琦; 邢玉明; 郑文远; 郝兆龙

doi:10.13700/j.bh.1001-5965.2021.0140

环肋翅片管相变传热特性及分形优化

doi: 10.13700/j.bh.1001-5965.2021.0140

1.
北京航空航天大学航空科学与工程学院, 北京 100191
2.
航空机电系统综合航空科技重点实验室，南京 211106

基金项目:

航空科学基金 20172851018

详细信息

通讯作者:
郝兆龙, E-mail: haozhaolong@buaa.edu.cn

中图分类号: TK124
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- 文章访问数: 327
- HTML全文浏览量: 117
- PDF下载量: 14
- 被引次数: 0
出版历程
- 收稿日期: 2021-03-25
- 录用日期: 2021-05-14
- 网络出版日期: 2021-07-01
- 整期出版日期: 2022-12-20

Phase change heat transfer characteristics and fractal optimization of radial plate fin tube

1.
School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China
2.
Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration, Nanjing 211106, China

Funds:

Aeronautical Science Foundation of China 20172851018

More Information

Corresponding author: HAO Zhaolong, E-mail: haozhaolong@buaa.edu.cn

摘要

摘要:
基于管壳式相变换热器，通过数值模拟方法研究了35号石蜡在矩形环肋翅片管外的融化传热特性，建立肋片单元三维模型研究热流体温度、肋片高度参数对传热过程的影响，并探究了分形结构翅片的优化传热性能。结果表明：矩形环肋翅片管外相变融化过程分为传热速率差异明显的3段，适用于不同功率需求；提高热流体入口温度和相变材料温差近似等比增强总传热功率；肋片高度由10 cm分别提高至12.5 cm、15 cm时，总融化时间分别缩短42.89%、71.96%，增强传热，但功率重量比降低；分形结构优化翅片总融化时间缩短41.95%，功率提高，为相变翅片管的优化设计提供参考。
- 相变换热器 /
- 数值模拟 /
- 环肋翅片 /
- 分形理论 /
- 强化传热
Abstract:
Based on the shell and tube phase change heat exchanger, the melting heat transfer characteristics of 35 paraffin outside the rectangular radial plate fin tube were studied by numerical simulation method. The three-dimensional model of fin element was established to study the influence of thermal fluid temperature and fin height parameters on the heat transfer process, and the heat transfer performance of optimal fractal fin was explored. The results show that the melting process can be divided into three stages with different heat transfer rates, which are suitable for different power requirements. Increasing the inlet temperature of the hot fluid and the temperature difference of the phase change material can enhance the total heat transfer power approximately in equal proportion. When the fin height is increased from 10 cm to 12.5 cm and 15 cm, the total melting time is reduced by 42.89% and 71.96%, and the heat transfer is enhanced, but the power to weight ratio is reduced. The total melting time is reduced by 41.95% with fractal structure optimization and the power is increased, which provides a reference for the optimal design of phase change finned tube.
- phase change heat exchanger /
- numerical simulation /
- radial plate fin /
- fractal theory /
- enhanced heat transfer

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图 1 实验装置

Figure 1. Experimental device

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图 2 变工况热流体出口温度

Figure 2. Outlet temperature of hot fluid under different working conditions

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图 3 数值模拟的几何模型

Figure 3. Geometric layout of simulated model

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图 4 矩形翅片单元网格

Figure 4. Rectangular fin cell grid

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图 5 实验结果与数值模拟对比

Figure 5. Comparison of experimental results and numerical simulation

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图 6 网格无关性分析

Figure 6. Grid independence analysis

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图 7 相变过程液相率云图

Figure 7. Melting process of phase change reflected by liquid phase rate of PCM

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图 8 肋片单元相变材料速率云图

Figure 8. Velocity cloud diagram of PCM in fin unit

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图 9 70 ℃、75 ℃、80 ℃工况3阶段时间曲线

Figure 9. Three stages time curves of 70 ℃, 75 ℃, 80 ℃ working conditions

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图 10 10 cm、12.5 cm、15 cm肋片高度3阶段时间曲线

Figure 10. Three stages time curve of fins height 10 cm, 12.5 cm, 15 cm

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图 11 十字分形翅片单元网格

Figure 11. Cross fractal fin element mesh

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图 12 翅片单元液相率随时间变化曲线

Figure 12. Liquid phase rate changes with time

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表 1 35号石蜡物性参数

Table 1. Physical properties of No. 35 paraffin

参数	数值
密度/(kg·m^-3)	785
潜热值/(kJ·kg^-1)	175.24
熔化温度/℃	35~37
导热系数/(W·(m·K)^-1)	0.3
比热容/(J·(kg·K)^-1)	2 850
黏度/(kg·(m·s)^-1)	0.000 365
热膨胀系数/K^-1	0.000 308 5

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