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科学通报  2015 

相变材料在含翅片球形容器内的约束熔化传热过程

DOI: 10.1360/N972014-01216, PP. 1125-1131

Keywords: 相变材料,储热,球形容器,翅片,约束熔化,强化传热

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Abstract:

为了定量评估翅片对球形容器内相变材料储热性能的影响,本文采用数值模拟与试验相结合的方法研究了等温加热条件下添加不同高度环形翅片时球形容器内的约束熔化传热过程.数值模拟中采用焓模型描述相变过程,并利用有限容积法求解控制方程.与可视化试验结果的对比表明,该方法可以较好地预测熔化过程中固液相界面的演化趋势.通过对数值模拟得到的熔化过程中自然对流流形和温度场的分析可以发现,添加环形翅片不仅起到了增强导热的作用,还能够强化翅片附近特定区域的自然对流传热.在本文所研究的工况下,添加高度与球体半径之比为0.25,0.50和0.75的翅片可以使总熔化时间分别减少约10.6%,20.2%和28.7%,显著加快了球形容器的储热速率.

References

[1]  1 Zalba B, Marín J M, Cabeza L F, et al. Review on thermal energy storage with phase change: Materials, heat transfer analysis and applications. Appl Therm Eng, 2003, 23: 251-283
[2]  2 Fan L, Khodadadi J M. Thermal conductivity enhancement of phase change materials for thermal energy storage: A review. Renew Sust Energ Rev, 2011, 15: 24-46
[3]  3 Tan F L. Constrained and unconstrained melting inside a sphere. Int Commun Heat Mass, 2008, 35: 466-475
[4]  4 Moore F E, Bayazitoglu Y. Melting within a spherical enclosure. J Heat Trans-T ASME, 1982, 104: 19-23
[5]  5 Roy S K, Sengupta S. Gravity-assisted melting in a spherical enclosure: Effects of natural convection. Int J Heat Mass Tran, 1990, 33: 1135-1147
[6]  6 Khodadadi J M, Zhang Y. Effects of buoyancy-driven convection on melting within spherical containers. Int J Heat Mass Tran, 2001, 44: 1605-1618
[7]  7 Tan F L, Hosseinizadeh S F, Khodadadi J M, et al. Experimental and computational study of constrained melting of phase change materials (PCM) inside a spherical capsule. Int J Heat Mass Tran, 2009, 52: 3464-3472
[8]  8 Hosseinizadeh S F, Darzi A A, Tan F L. Numerical investigations of unconstrained melting of nano-enhanced phase change material (NEPCM) inside a spherical container. Int J Therm Sci, 2011, 51: 77-83
[9]  9 Koizumi H. Time and spatial heat transfer performance around an isothermally heated sphere placed in a uniform downwardly directed flow (in relation to the enhancement of latent heat storage rate in a spherical capsule). Appl Therm Eng, 2004, 24: 2583-2600
[10]  10 Robak C W, Bergman T L, Faghri A. Enhancement of latent heat energy storage using embedded heat pipes. Int J Heat Mass Tran, 2011, 54: 3476-3484

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