Experiment on the unconstrained melting of paraffin in spherical containers

GAO Zeshi; YAO Yuanpeng; WU Huiying

doi:10.11949/j.issn.0438-1157.20181341

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Experiment on the unconstrained melting of paraffin in spherical containers

Fluid dynamics and transport phenomena | 更新时间：2026-07-24

- Experiment on the unconstrained melting of paraffin in spherical containers
- CIESC Journal Vol. 70, Issue 7, Pages: 2480-2487(2019)
- 作者机构：
  
  上海交通大学机械与动力工程学院，上海 200240
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20181341
  CLC： TK 124
- Received：15 November 2018，
  
  Revised：2019-04-02，
  
  Online First：24 July 2026，
  
  Published：05 July 2019
- 稿件说明：
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高泽世, 姚元鹏, 吴慧英. 球形容器内石蜡非约束融化特性实验[J]. 化工学报, 2019, 70(7): 2480-2487

GAO Zeshi, YAO Yuanpeng, WU Huiying. Experiment on the unconstrained melting of paraffin in spherical containers[J]. CIESC Journal, 2019, 70(7): 2480-2487
高泽世, 姚元鹏, 吴慧英. 球形容器内石蜡非约束融化特性实验[J]. 化工学报, 2019, 70(7): 2480-2487 DOI： 10.11949/j.issn.0438-1157.20181341.

GAO Zeshi, YAO Yuanpeng, WU Huiying. Experiment on the unconstrained melting of paraffin in spherical containers[J]. CIESC Journal, 2019, 70(7): 2480-2487 DOI： 10.11949/j.issn.0438-1157.20181341.

摘要

通过可视化实验研究了球内受空隙影响的石蜡（RT27）非约束融化过程，探讨了球直径、加热温度、初始温度以及相变材料（PCM）填充率对球内非约束融化特性的影响。通过对PCM固液界面演化、固相运动等融化行为的观察发现，受球内空隙影响，非约束融化过程会出现固相PCM先漂浮后下沉的融化模式。进一步的量化结果表明：增大球直径，固相PCM漂浮时间先增大后减小，总融化时间则持续增大；提升加热温度和初始温度，固相PCM漂浮时间和总融化时间减小；增大PCM填充率，固相漂浮时间和总融化时间先增大后减小。最后，通过对实验数据的无量纲化分析，提出了无量纲总融化时间（受Rayleigh数、Stefan数、PCM填充率、无量纲初始温度影响）关系式。

Abstract

A visualization experiment is conducted to investigate the unconstrained melting process of phase change material (PCM

paraffin RT27) with void in a spherical container. Factors including the spherical container diameter

the heating temperature

the initial temperature and the filling ratio of PCM are discussed. Melting behaviors including the solid-liquid interface evolution and the solid PCM motion are revealed

in which a melting mode of floating melting following by close-contact melting is observed due to the existence of void in the spherical container. The quantitative results show that as the spherical container diameter increases

the floating melting time increase first and then decreases

while the total melting time shows a continually increasing trend. Increasing heating temperature or increasing initial temperature will decrease the floating melting time and total melting time. With the increases of PCM filling ratio

the PCM floating melting time and the total melting time increase first and then decrease. Finally

a dimensionless total melting time correlation in terms of Rayleigh number

Stefan number

filling ratio of PCM and dimensionless initial temperature is proposed.

关键词

Keywords

references

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