Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
권호 표지

A Study on Convective Heat Transfer of Microcapsulated Lauric Acid Slurry in Laminar Flows Through a Circular Pipe

미립피복 로릭산 슬러리의 층류 관내 대류 열전달에 관한 연구

  • Choi Eunsoo (Department of Mechanical Engineering, Myongji University) ;
  • Jung Dongju (Thermal Engineering Laboratory, Myongji University)
  • 최은수 (명지대학교 기계공학과) ;
  • 정동주 (명지대학교 열공학실험실)
  • Published : 2004.11.01
Download PDF
⟨ Previous Next ⟩

Abstract

The objective of the present study is to reveal thermal characteristic of micro-capsulated lauric acid slurry, which has high latent heat during phase change from solid to liquid, in circular pipe. Tests were performed with the microcapsulated lauric acid slurry in the heating test section with a constant heat flux boundary condition. Local Nusselt number and the effective thermal capacity were measured. As the sizes of microcapsulated lauric acids were increased, local Nusselt numbers of microcapsulated lauric acid slurries were increased. The effective thermal capacity of microcapsulated lauric acid slurry was 1.43 times larger than that of water.

Keywords

References

  1. Choi, E., 1998, Formation of a paraffin slurry and its convective heat transfer in a circular pipe, Korean Journal of Mechanical Engineering, Vol. 22, No.1, pp.50-60
  2. Sohn, C. W. and Chen, M. M., 1981, Microconvective thermal conductivity in disperse two-phase mixtures as observed in a low velocity Couette flow experiment, ASME J.Heat Transfer, Vol. 103, pp.47-51 https://doi.org/10.1115/1.3244428
  3. Charunyakorn, P., Sengupta, S. and Roy, S.K., 1991, Forced convection heat transfer in microencapsulated phase change material slurries: flow in circular ducts, International Journal of Heat Mass Transfer, Vol. 34, No.3, pp. 819-833
  4. Knodel, B. D., 1988, Pressure drop and heat transfer in turbulent ice-water slurries in horizontal pipes, MS thesis, University of Illinois, U.S.A.
  5. Inaba, H., 1997, Current status of research on functionally thermal fluid-new challenge in advanced thermal energy storage and thermal energy transportation-Experimental Heat Transfer, Fluids Mechanics and Thermodynamics.
  6. Choi, E. S. and Kim, J. W., 1997, Viscosity of slurry of microencapsulated lauric acid in various sizes measured by a rotating-cylinder viscometer, Proceedings of the KSME Autumn Annual Meeting, pp.552-557.
  7. Colvin, D. P., Mulligan, J. C. and Bryant, Y.G., 1992, Enhanced heat transfer in environmental systems using microcapsulated phase change materials, 22nd International Conference on Environmental Systems.
  8. Kays, W. M. and Crawford, M. E., 1980, Convective Heat and Mass Transfer, McGrawHill, New York, pp. 132-134.
  9. Choi, E. S., 2001, Phase-change temperature of Micro-encapsulated phase-change material,Journal of Air-Conditioning and Refrigeration Engineering, Vol. 14, No.2, pp.168-174.