Browse > Article

Effect of Capsule Shape on Heat Storage  

정재동 (세종대학교 기계공학과)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.14, no.11, 2002 , pp. 964-971 More about this Journal
Abstract
A numerical investigation of the constrained melting of phase change materials within spherical-like capsule is presented. A single-domain enthalpy formulation is used for simulation of the phase change phenomenon. The solution methodology is verified with the melting process inside an isothermal spherical capsule. Especially, the effect of capsule shape on the heat storage is emphasized. Two shape parameters are considered from the real capsule shape showing good characteristics of heat storage and the effect of these parameters is examined. Early during the melting process, the conduction mode of heat transfer is dominant. Thus the capsule shape with large surface area is desirable. However, the capsule shape with large surface area plays negative role on the strength of buoyancy-driven convection that becomes more important as melting continues.
Keywords
Heat storage; Capsule shape; Phase change;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Kim, D. H., Kim, D. C.. Kim, I. G., Kim, Y. K. and Yim, C. S., 1997, A study on the heat transfer characteristics during outward melting process of ice in a vertical cylinder, Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 9, pp. 171-179
2 EnE System, www.enesystem.co.kr
3 Khodadadi, J. M. and Zhang, Y., 2001, Effect of buoyancy-driven convection on melting within spherical containers, Int. J. Heat Mass Transfer, Vol. 44, pp. 1605-1618   DOI   ScienceOn
4 Kawanami, T., Fukusako, S., Yamada, M. and Itoh, K., 1999, Experiments on melting of slush ice in a horizontal cylindrical capsule, Int. J. Heat Mass Transfer, Vol. 42, pp. 2981-2990   DOI   ScienceOn
5 Patankar, S. V., 1980, Numerical heat transfer and fluid flow, Hemisphere Publishing Corporation
6 Voller, V. R. and Swaminathan, C. R., 1991, General source-based method for solidification phase change, Numerical Heat Transfer, Part B, Vol. 19, pp. 175-189
7 Chung, J. D., Kim, C.-J., Yoo, H. and Lee, J. S., 1999, Numerical investigation on the bifurcative natural convection in a horizontal concentric annulus, Numerical Heat Transfer, Part A, Vol. 36, pp. 291-307
8 Chung, J. D., Lee, J. S. and Yoo, H., 1997, Thermal instability during the melting process in an isothermally heated horizontal cylinder, Int. J. Heat Mass Transfer, Vol. 40, pp. 3899-3907   DOI   ScienceOn
9 Yamada, M., Fukusako, S., Kawanami, T. and Watanabe, C., 1997, Melting heat transfer characteristics of a horizontal ice cylinder immersed in quiescent saline water, Int. J. Heat Mass Transfer, Vol. 40, pp. 4425-4435   DOI   ScienceOn
10 Kim, C.-J., Ro, S. T. and Lee, J. S., 1993, An efficient computational technique to solve the moving boundary problems in the axisymmetric geometries, Int. J. Heat Mass Transfer, Vol. 36, pp. 3759-3764   DOI   ScienceOn