Effect of Maximum Temperature and Heating-Cooling Repeated Cycles on Thermal Contact Resistance of a Composite Tube

Abstract:

Experimental research results of the operational parameter effect on Thermal Contact Resistance (TCR) in a copper-aluminum L-type finned tube are presented. The investigated operational parameters were the maximum operational temperature and the number of repeated heating-cooling cycles. The TCR was experimentally determined by measuring the total heat supply, core tube wall and inner fin surface temperatures for steady-state and natural-convection conditions. In addition, the specimen was tested through up to 200 heating-cooling cycles. The experimental results showed a TCR increase of 81% at the same time as the average temperature difference between the hot inner flow and cooling air increased from 30°C to 130°C; over the maximum operational temperature (120°C), the TCR increased faster than before; and, after the heating-cooling cycle testing the TCR presented an increase of 31% in respect with the initial value. Such findings may be useful as a reference for preliminary thermal design and as recommendations for optimal operation of heat exchangers based on copper-aluminum L-type finned tubes.

• Periodical: Applied Mechanics and Materials (Volume 15)
• Pages: 41-46
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.15.41
• Online since: August 2009
• Authors: I. Carvajal-Mariscal, F. Sánchez-Silva, G. Polupan, J.A. Basualdo-Rojo
• Keywords: Composite L-Type Finned Tube, Operational Parameters, Thermal Contact Resistance

References

[1] R. Krupiczka, A. Rotkegel and H. Walcyk: Proc. International Symposium on Compact Heat Exchangers, Grenoble, (2002), pp.317-322.

[2] P. D. Hills: Practical Heat Transfer, Begell House (2005).

[3] C. V. Madhusudana, L. S. Fletcher and G. P. Peterson: Journal of Thermophysics, Vol. 4 (1989), pp.204-211.

[4] V. B. Kuntysh and N. N. Stenin: Chemical and Petroleum Engineering, Vol. 33 (1997), pp.665-671.

[5] A. E. Piir, S. P. Roshchin, V. B. Kuntysh, A. N. Bessonnyi, A. Sh. Minnigaleyev and V. P. Mulin: Chemical and Petroleum Engineering, Vol. 42 (2006), pp.235-240.

DOI: 10.1007/s10556-006-0085-2

[6] V. B. Kuntysh: Chemical and Petroleum Engineering, Vol. 36 (2000), pp.407-413.

[7] A. E. Piir, S. P. Roshchin, A. Yu. Vereshchagin, V. B. Kuntysh and A. Sh. Minnigaleev: Chemical and Petroleum Engineering, Vol. 43 (2007), pp.519-522.

DOI: 10.1007/s10556-007-0091-z

[8] J. P. Holman: Experimental methods for engineers, McGraw-Hill, (1984).

[9] R. Lide David et al: CRC Handbook of Chemistry and Physics, (2003).