具有分形翅片的相变蓄热单元熔化过程数值模拟分析

周晴晴; 侯娜娜; 岳亮丞; 李树谦; 史金雨; 师帅

doi:10.16056/j.2096-7705.2022.03.012

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具有分形翅片的相变蓄热单元熔化过程数值模拟分析

研究与探讨 | 更新时间：2026-01-19

- 具有分形翅片的相变蓄热单元熔化过程数值模拟分析
- Numerical Simulation of Melting Process of Phase Change Heat Storage Unit with Fractal Fins
- 能源研究与管理 2022年第3期页码：70-76
- 作者机构：
  
  1. 河北水利电力学院土木工程系
  2. 河北省数据中心相变热管理技术创新中心
  3. 沧州市储热及低品位余热利用型电磁供热技术创新中心
  4. 河北建筑工程学院能源工程系
  5. 河北省水利工程局集团有限公司
- 作者简介：
- 基金信息：
  
  河北省教育厅科学技术研究项目资助（ZD2019032）;河北省自然科学基金项目（E2020412176）;河北省高等学校科学技术研究青年基金项目（QN2021094）
- DOI：10.16056/j.2096-7705.2022.03.012
  中图分类号： TK11
- 纸质出版：2022
- 稿件说明：
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周晴晴, 侯娜娜, 岳亮丞, 等. 具有分形翅片的相变蓄热单元熔化过程数值模拟分析[J]. 能源研究与管理, 2022,(3):70-76.

周晴晴, 侯娜娜, 岳亮丞, et al. Numerical Simulation of Melting Process of Phase Change Heat Storage Unit with Fractal Fins[J]. 2022, (3): 70-76.
周晴晴, 侯娜娜, 岳亮丞, 等. 具有分形翅片的相变蓄热单元熔化过程数值模拟分析[J]. 能源研究与管理, 2022,(3):70-76. DOI： 10.16056/j.2096-7705.2022.03.012.

周晴晴, 侯娜娜, 岳亮丞, et al. Numerical Simulation of Melting Process of Phase Change Heat Storage Unit with Fractal Fins[J]. 2022, (3): 70-76. DOI： 10.16056/j.2096-7705.2022.03.012.

摘要

相变材料热导率较低，使得相变储热装置性能受到限制。为提高相变储热装置性能，针对不同分形结构的管壳式相变储热装置，利用数值模拟方法分析了有无分形翅片下相变材料熔化过程特性。结果表明，分形结构能够显著强化相变材料的熔化速率，在液态相变材料浮升力作用下储热单元上部温度较高于下部。当套管中内壳内壁面温度为90℃时，无分形结构的翅片套管式相变蓄热单元的熔化时长为110 s，而具有60°和90°分形结构的蓄热单元的熔化时间分别缩短了27.27%和36.36%。无分形结构、具有60°分形结构和具有90°分形结构装置在熔化稳定后平均温度分别约为338、341、343 K。此外发现，随着相变材料的逐渐熔化，自然对流换热效果呈现先逐渐增强，在达到旺盛自然对流阶段后又逐渐减弱，其原因主要是由于温度场逐渐趋于均匀，自然对流的温差减小所致。

Abstract

The low thermal conductivity of phase change material restricts the performance of phase change heat storage device. In order to improve the performance of phase change heat storage devices

the melting process characteristics of phase change materials with or without fractal fins are analyzed by numerical simulation for shell and tube phase change heat storage devices with different fractal structures. The results show that the fractal structure can significantly enhance the melting rate of the PCM

and the temperature of the upper part of the heat storage unit is higher than that of the lower part under the lifting force of the liquid PCM. When the inner wall temperature of the inner shell in the casing is 90 ℃

the melting time of the finned casing phase change heat storage unit without fractal structure is 110 s

while the melting time of the heat storage unit with 60° and 90° fractal structure is shortened by 27.27% and 36.36%

respectively. The average temperature of the device without fractal structure

with 60° fractal structure and with 90° fractal structure after melting stabilization is about338

341 and 343 K

respectively. In addition

it is found that with the gradual melting of phase change materials

the heat transfer effect of natural convection first gradually increases

and then gradually decreases after reaching the vigorous natural convection stage. The main reason is that the temperature field gradually tends to be uniform

and the temperature difference of natural convection decreases.

关键词

Keywords

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