Nuclear Techniques ›› 2016, Vol. 39 ›› Issue (9): 90601-090601.doi: 10.11889/j.0253-3219.2016.hjs.39.090601

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Experimental study on paraffin melting in a cylindrical cavity

WANG Shuai, PENG Changhong, GUO Yun   

  1. School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230027, China
  • Received:2016-06-06 Revised:2016-07-01 Online:2016-09-10 Published:2016-09-09
  • Supported by:

    Supported by National Natural Science Foundation of China(No.11305169)

Abstract:

Background: Melting process is very complex in serious accident of reactor.However,because of the complex structure and materials,it is too hard to investigate the phenomenon directly.Purpose: This paper aimed at clarifying the factors affecting the melting process.Methods: A simple melting process of phase change materials(paraffin)inside a cylindrical container is presented experimentally in this study.Under different boundary conditions of the cylindrical outside surface,paraffin was heated to melt by the heating rod placed in the center of the cylindrical container.Results: Phase front and liquid fraction during the melting process are obtained by interpolation method.Conclusion: Due to heat conduction in early stage,paraffin near heating rod begins to melt,and then the generation and intensification of natural convection accelerate phase change in the upper region of the cylinder,causing significant temperature stratification in the upper region.Moreover,temperatures flat phenomena at some positions are described and discussed in detail.Besides,the effect of different heating power and boundary conditions on melting rate is compared,as well as the temperature of water bath.

Key words: Melting process, Phase change, Paraffin, Cylindrical cavity, Natural convection

CLC Number: 

  • TL364