Turbulent Convective Heat Transfer in a Transversely Grooved Tube with Natural Convection Effect

Abstract:

The turbulent convective heat transfer in a transversely grooved tube of molten salt with natural convection effect has been numerically investigated. In general, the average Nusselt number with and without considering natural convection in transversely grooved tube was almost equal. According to the simulated results, the heat transfer coefficient of transversely grooved tube in upside region was lower than that of downside region. The effect of natural convection on unilateral heat transfer in transversely grooved tube was more obvious with lower Reynolds number and higher inlet temperature, and the effect of natural convection on unilateral heat transfer was lower with bigger groove deep.

• Periodical: Applied Mechanics and Materials (Volume 741)
• Pages: 458-461
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.741.458
• Online since: March 2015
• Authors: Xiang Yang Shen, Jing Ding*, Jian Feng Lu
• Keywords: Convective Heat Transfer, Molten Salt, Natural Convection, Transversely Grooved Tube

References

[1] G.J. Janz, Molten Salts Handbook, Academic Publisher, New York, (1967).

[2] J.E. Pacheco, Final Test and Evaluation Results from the Solar Two Project, Sandia National Laboratories Technical, Report SAND2002-0120, (2002).

[3] Y. Zhen, S.V. Garimella, Thermal analysis of solar thermal energy storage in a molten-salt therm˚Cline, Solar Energy, 88 (2011) 974-985.

DOI: 10.1016/j.solener.2010.03.007

[4] H.W. Hoffman, J. Lones, Fused salt heat transfer, Part II: forced convection heat transfer in circular tubes containing NaF-KF-LiF eutectic, Report No. ORNL-1777, (1955).

DOI: 10.2172/4016896

[5] H.W. Hoffman, S.I. Cohen, Fused salt heat transfer, Part III: forced convection heat transfer in circular tubes containing the salt mixture NaNO2-KNO3-NaNO3, Report No. ORNL-2433, (1960).

DOI: 10.2172/4181833

[6] T.S. Ravigururajan, A.E. Bergles, Development and verification of general correlations for pressure drop and heat transfer in single-phase turbulent flow in enhanced tubes, Experimental Thermal and Fluid Science, 13 (1996) 55-70.

DOI: 10.1016/0894-1777(96)00014-3

[7] P.G. Vicente, A. Garcia, A. Viedma, A mixed convection heat transfer and isothermal pressure drop in grooved tubes for laminar and transition flow, International Communications in Heat and Mass Transfer, 31 (2004) 651-662.

DOI: 10.1016/s0735-1933(04)00052-1

[8] J.F. Lu, X.Y. Sheng, J. Ding, J.P. Yang, Transition and turbulent convective heat transfer of molten salt in spirally grooved tube, Experimental Thermal and Fluid Science, 47 (2013) 180-185.

DOI: 10.1016/j.expthermflusci.2013.01.014

[9] C. Chen, Y.T. Wu, S.T. Wang, C.F. Ma, Experimental investigation on enhanced heat transfer in transversally grooved tube with molten salt, Experimental Thermal and Fluid Science, 47 (2013) 108-116.

DOI: 10.1016/j.expthermflusci.2013.01.006

[10] J.F. Lu, X.Y. Shen, J. Ding, et al, Convective heat transfer of high temperature molten salt in transversely grooved tube[J]. Applied Thermal Engineering, 61 (2013) 157-162.

DOI: 10.1016/j.applthermaleng.2013.07.037