THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

online first only

Melting front propagation in a paraffin-based phase change material-lab-scale experiment and simulations

ABSTRACT
The paper reports experimental and numerical investigation of the melting front propagation in a paraffin-based Phase Change Material (PCM). The investigated case was a block of PCM with a heat flux introduced at one of its sides. The PCM block was contained in a transparent container and thus the propagation of the melting front could be monitored with a camera. The melting temperature of the PCM was 28°C and the container was located in an environmental chamber where the ambient temperature was maintained at 27°C during the experiment. The natural convection in the melted PCM played an important role and it had to be considered in the heat transfer models. The numerical models taking into account natural convection in liquid PCM require long computation times, and therefore they are impractical if the fast computation of the melting front position is needed. The effective heat conductivity approach can be used to overcome this issue. Two numerical models were compared; an in-house heat transfer model using effective conductivity approach developed in MATLAB and a more advanced model created in the off-the-shelf simulation tool COMSOL, which accounts for the natural convection in liquid PCM.
KEYWORDS
PAPER SUBMITTED: 2016-11-09
PAPER REVISED: 2016-12-08
PAPER ACCEPTED: 2016-12-25
PUBLISHED ONLINE: 2017-01-14
DOI REFERENCE: https://doi.org/10.2298/TSCI161109322S
REFERENCES
  1. Wang, Z. F., et al., Inverse problem-coupled heat transfer model for steel continuous casting, Journal of Materials Processing Technology, 214 (2014), 1, pp. 44-49.
  2. Wang, K., et al., Modeling dendrite growth in undercooled concentrated multi-component alloys, Acta Materialia, 61 (2013), 11, pp. 4254-4265.
  3. Zhou, D., et al., Review on thermal energy storage with phase change materials (PCMs) in building applications, Applied Energy, 92 (2012), 1, pp. 593-605.
  4. Lewis, R. W., Ravindren, K., Finite element simulation of metal casting, International Journal for Numerical Methods in Engineering, 47 (2000), 1-3, pp. 29-59.
  5. Li, C. Y., et al., A fixed-grid front-tracking algorithm for solidification problems. Part I - Method and validation, Numerical Heat Transfer B, 43 (2003), pp. 117-141
  6. Snoeck, D., et al., Encapsulated phase change materials as additives in cementitious materials to promote thermal comfort in concrete constructions, Materials and Structures, 49 (2016), pp. 225-239
  7. Liu, H., Awbi, H. B., Performance of phase change material boards under natural convection, Building and Environment, 44 (2009), pp. 1788-1793
  8. Oksman, P., et al., The effective thermal conductivity method in continuous casting of steel, Acta Polytechnica Hungarica, 11 (2014), pp. 5-22
  9. Sun, X., et al., Experimental observations on the heat transfer enhancement caused by natural convection during melting of solid-liquid phase change materials (PCMs), Applied Energy, 162 (2016) 1453-1461.
  10. Calvet, N., et al., Enhanced performances of macro-encapsulated phase change materials (PCMs) by intensification of the internal effective thermal conductivity, Energy, 55 (2013), pp. 56-964
  11. Rubitherm GmbH website. <www.rubitherm.de/>
  12. Morgan, K., et al., Improved algorithm for heat-conduction problems with phase-change, International Journal for Numerical Methods in Engineering, 12 (1978), 7, pp. 1191-1195.
  13. Samara, F., et al., Natural convection driven melting of phase change material: comparison of two methods, Proceedings, The 2012 COMSOL Conference, Boston, 2012.
  14. Stefanescu, D. M., Science and Engineering of Casting, Springer, New York, USA, 2010.
  15. Taheri, P., Natural convection heat transfer, in: Engineering Thermodynamics and Heat Transfer, Simon Fraser University.
  16. Hadgu, T., et al., Comparison of CFD Natural Convection and Conduction-only Models for Heat Transfer in the Yucca Mountain Project Drifts, Proceedings, ASME 2004 Heat Transfer/Fluids Engineering Summer Conference, Charlotte, USA, 2004, pp. 223-232
  17. F. P. Incropera, et al., Principles of Heat and Mass Transfer, Wiley, New York, USA, 2013.