Investigation on the Condensation Heat Transfer Augmentation by Large Porosity Tube Inserts

Abstract:

By analyzing and comparing several types of enhancement of heat transfer measures used presently in condenser, a new method of augmentation condensation heat transfer is presented in this paper, that is, tube inserts with porous body of large porosity---twined coil. And the theoretical analysis and experimental investigation are carried out. The results show that it can make the fluids perform complicated three-dimensions mixed flow, make the heat flux appear “sudden” jump at lower temperature difference, make the flow go into turbulence ahead of time. The heat flux enhancement ratio increases by 3-4 times. If compared with other inserts, twined coil insert not only has better heat transfer enhancement performance, but also produces very small pressure drop, so it is an ideal and high efficiency energy saving technology. In the view of its application prospect, the feasibility of twined coil inserts applied to solar heat pump system is analyzed.

• Periodical: Advanced Materials Research (Volumes 608-609)
• Pages: 1186-1189
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.608-609.1186
• Online since: December 2012
• Authors: Jun Lan Yang
• Keywords: Augmentation, Condensation Heat Transfer, Tube Inserts, Twined Coil

References

[1] Xiaoying Ma. Advances in the convective heat transfer enhancement of single-phase flow in tubes with twisted tapes. Energy Research and Information, Vol. 29 (2011), pp.50-54. (In Chinese)

[2] Jian Guo, Kun Yang, Wei Liu. Numerical simulation of heat transfer by adding cross twisted-tape in the circular tube. Journal of Engineering Thermophysics, Vol. 30 (2009), pp.1216-1218. (In Chinese)

[3] Zhiwei Tang, Guilan Yan, Lili Gao. Numerical simulation of heat transfer enhancement for twisted inserts in tubes. Journal of Engineering Thermophysics, Vol.29 (2008), pp.1211-1214. (In Chinese)

[4] Geng Chen, Dian Luo. Augmentation of convective heat transfer by means of high porosity porous insert. Journal Engineering of Thermophysics, Vol. 16(1995), pp.344-348. (In Chinese)

[5] Shouxiang Xing, Dian Luo. Experimental study of flow characteristics for tubes with twisted coil insert. Journal of Jiamusi Institute of Technology, Vol. 16 (1998), pp.260-263. (In Chinese)

[6] Chengying Qi, Yiqin Yu, Yibing Li, et al. A semi-empirical correlation of condensation augmentation by porous body inserts. Journal of Engineering Thermophysics, Vol. 21(2000), pp.81-84. (In Chinese)

[7] Junlan Yang. Experimental study of augmentation condensation heat transfer with twined coil insert. Hebei Industry and Technology University Master thesis, 1996. (In Chinese)