Experimental InvestigationOf The Effect Of Turbulators On Heat Transfer In Horizontal Tubes

Yıl 2017, Cilt: 17 Sayı: 2, 810 - 817, 31.08.2017

Şendoğan Karagöz Hossein Abdi Gökhan Ömeroğlu

Öz

The interest in increasing heat transfer is growing in line with industrial development. In relation to the cooling and heating systems, in particular in industrial-type boilers, the heating boilers and heat exchangers, the use of inserts to enhance heat transfer is quite common. During the design of the heat exchanger while increasing heat transfer, the friction hence the pressure loss will increase as well. As a matter of course, the cost of increased energy consumption for pumping fluid in tubes should be compensated with the reduction in cost of the device.

In this experimental study, turbulence creating flaps have been placed into the tubes and compared to the empty tube. Experiments have been carried out using three springs and three twisted tapes having different pitches, and five different Reynolds numbers. The effects on the friction factor and on the number of Nusselt were investigated.

Anahtar Kelimeler

Turbulator, Heat Transfer, Pressure Drop, Horizontal tube

Kaynakça

• Argunhan, Z. and Yildiz, C., 2006. DaireselKesitliBirBorununGirişineYerleştirilenDelikli SabitKanatçıklıDönmeÜreticinin Isı GeçişiveBasınçDüşüşüneEtkileri, PamukkaleUniversty Engineering FakültesiMühendislikBilimleriDergisi, 12 (2), 217– 223.
• Eiamsa-ard, S. and Promvonge, P., 2005. Enhancement of Heat Transfer in a Tube with Regularly spaced Helical Tape Swirl Generators,Solar Energy, 78, 483–494.
• Eiamsa-ard, S., Thianpong, C., Eiamsa-ard, P., 2010. Thermal Characteristics in a Heat Exchanger Tube Fitted with Dual Twisted Tape Elements in Tandem,Int. J. Heat Mass Transfer, 37:1, 39–46.
• Guo, J., Fan, A., Zhang, X., Liu, W., 2011. A numerical study on heat transfer and friction factor characteristics of laminar flow in a circular tube fitted with center-cleared twisted tape,International Journal of Thermal Sciences, 50:7, 1263–1270.
• Küçük, H., Bali, T., Ayhan, T., 2000.Experimental Investigation of Effects of Helical Inserts with Conical Surface Placed at Pipe Inlet on Heat Transfer and Friction Coefficient. Proc.: Turkish National Conference on Thermal Sciences and Technologies (ULIBTK), Sakarya, 741–745.
• Lee, C. K. and Abdel-Moneim, S. A., 2001. Computational Analysis of Heat Transfer in Turbulent Flow Past a Horizontal Surface with Two- Dimensional Ribs,Int. Comm. Heat Mass Transfer, 28:2, 161–170.
• Sparrow, E. M. and Chaboki, A., 1984. Turbulent Fluid Flow and Heat Transfer in a Circular Tube,ASME Journal of Heat Transfer, 106, 766–773.
• Yakut, K. and Sahin, B., 2004. The Effects of Vortex Characteristics on Performance of Coiled Wire Turbulators Used for Heat Transfer Augmentation,Applied Thermal Engineering, 24, 2427–2438.
• Yıldız, C., Biçer, Y., Pehlivan, D., 1996. Influence of Fluid Rotation on The Heat Transfer and Pressure Drop in Double-Pipe Heat Exchangers,Applied Energy, 54, 49–56.
• Yıldız, C., Biçer, Y., Pehlivan, D., 1998. Effect of Twisted Strips on Heat Transfer and Pressure Drop in Heat Exchanger, Energy Conversion & Management, 39, 331–336.
• Zhu, J. X., Mitra, N. K.,Fiebig, M., 1993.Effects of Longitudinal Vortex Generators on Heat Transfer and Flow Loss in Turbulent Channel Flows,Int. J. Heat Mass Transfer, 36:9, 2339–2347.