Abstract
In this study, the incompressible turbulent flow in a circular channel with a series of conical hollow inserts, placed axisymmetrically, is investigated numerically and experimentally. In computations, FLUENT, a commercially available CFD code, is used. The inserts are installed in a diverging structure towards the incoming flow. The effect of the inserts geometry on the heat transfer at the wall is evaluated for a range of Reynolds number between 3000 and 20000. It is demonstrated that a significant enhancement in heat transfer from the tube wall occurs in comparison with the conventional plain tube, and the level of the enhancement depends on the flow rate, the type of the inserts and the installation positions of the inserts. In order to see the flow fields, the velocity profiles are shown. Using the entropy minimization technique the optimum geometries and the installation distances were estimated. The results obtained through the numerical simulation are compared with the experimental ones and, a satisfactory agreement is found.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
Similar content being viewed by others
References
Bergles, A.E., Ninmalan, V., Junkhan, G.H. and Webb, R.L. (1983) Bibliography on augmentation of convective heat and mass transfer II, Heat Transfer Laboratory Report HTL-31, ISU-ERIAmes 84222, DE-84018484, Iowa State University, Ames.
Yilmaz, T. and Ayhan, T. (1983) Heat transfer and pressure drop in adjacent channels with periodic enlargements, 4th National Congress of Thermal Sciences an Technology, pp. 133–149, Gaziantep, Turkey.
Ayhan, T. and Karabay, H. (1990) Observation on the influence of contracting and enlarging conical surfaces on heat transfer in the pipe flows, Journal of Thermal Sciences and Technology, 11, 4, pp. 39–43, Turkey.
Azak, Y., Demirtas, C. and Ayhan B., (1996), A second law analysis of the optimum design and operation of conical ring inserted tubes for turbulent flow heat transfer, Proceedings of the TIEES-96, vol. 2, pp. 651–656, Turkey.
Measurements of fluid flow in pipes using orifice, nozzle and venturi, ASME Standard, MFC-3M, (1984).
Spalding, D.B. and Launder, B.E., (1974), The numerical computations of turbulent flows, ComputerMethods in Applied Mechanics and Eng., vol. 3, pp. 269–289.
Bejan, A., (1996) Entropy Generation Minimization, CRC Press Inc., New York.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1999 Springer Science+Business Media Dordrecht
About this chapter
Cite this chapter
Ayhan, T., Azak, Y., Demirtas, C., Ayhan, B. (1999). Numerical and Experimental Investigation of Enhancement of Turbulent Flow Heat Transfer in Tubes by Means of Truncated Hollow Cone Inserts. In: Kakaç, S., Bergles, A.E., Mayinger, F., Yüncü, H. (eds) Heat Transfer Enhancement of Heat Exchangers. Nato ASI Series, vol 355. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-9159-1_18
Download citation
DOI: https://doi.org/10.1007/978-94-015-9159-1_18
Publisher Name: Springer, Dordrecht
Print ISBN: 978-90-481-5190-5
Online ISBN: 978-94-015-9159-1
eBook Packages: Springer Book Archive