Heat Transfer Enhancement Inside Elliptic Tube by Means of Rings Inserts

E. Z. Ibrahim

Abstract


Heat transfer, friction factor and enhancement efficiency characteristics in an elliptic tube fitted with elliptic rings have been investigated experimentally.  In the experiments, air was used as the tested fluid with a Reynolds number range of 10000 to 32464. The experimental results show a considerable increase in friction factor and heat transfer over the plain tube under the same operation conditions. Over the range investigated, the Nusselt numbers for both employed enhancement devices with different pitches are found to be higher than that of the plain tube. It was found that the best overall enhancement was achieved with pitch = 3d. The results obtained are correlated in the form of Nusselt number and friction factor as a function of Reynolds number and pitches. The results were compared with circular tubes have the same test conditions to show the difference between the circular and elliptic tubes.

Key words: Heat transfer enhancement; Elliptic tube


Keywords


Heat transfer enhancement; Elliptic tube

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References


[1] Khaled, R. (2007). Heat Transfer Enhancement in Hairy Fin Systems. Appl. Thermal Engineering, 27(1), 250 -257.

[2] Shoji, Y., Sato, K., & Oliver, D. (2003). Heat Transfer Enhancement in Round Tube Using Wire Coil Influence of Length and Segmentation. Heat Transfer-Asian Res., 32(2), 99-107.

[3] Zimparov, V. (2001). Enhancement of Heat Transfer by a Combination of Three-Start Spirally Corrugated Tubes with a Twisted Tape. Int. J. Heat Mass Transfer, 44, 551-574.

[4] Yakut, K., & Sahin, B. (2004). Flow-Induced Vibration Analysis of Conical Rings Used for Heat Transfer Enhancement in Heat Exchanger. Applied Energy, 78(3), 273-288.

[5] Promvonge, P., & Eiamsa-ard, S. (2006). Heat Transfer Enhancement in a Tube with Combined Conical-Nozzle Inserts and Swirl Generator. Energy Conversion and Management, 47(18-19), 2867-2882.

[6] Eiamsa-ard, S., & Promvonge, P. (2006). Experimental Investigation of Heat Transfer and Friction Characteristics in a Circular Tube Fitted with V-Nozzle Turbulators. International Communication in Heat and Mass Transfer, 33(5), 591-600.

[7] Smithberg, E., & Landis, F. (1964). Friction and Forced Convection Heat Transfer Characteristics in Tubes Fitted with Twisted Tape Swirl Generators. ASME J. Heat Transfer, 2, 39-49.

[8] Date A. W., & Singham, J. R. (1972). Numerical Prediction of Friction Factor and Heat Transfer Characteristics of Fully Developed Laminar Flow in Tubes Containing Twisted Tapes. ASME, 94, 54-58.

[9] Date, A. W. (1974). Prediction of Fully Developed Flow in Tube Containing a Twisted Tape. Int. J. Heat Mass Transfer, 17, 845-859.

[10] Hong S. W., & Bergles, A. E. (1976). Augmentation of Laminar Flow Heat Transfer in Tubes by Means of Twisted-Tape Inserts. ASME J. Heat Transfer, 98(2), 251-256.

[11] Eiamsa-ard, S., & Promvonge, P. (2005). Enhancement of Heat Transfer in a Tube with Regularly Spaced Helical Tape Swirl Generators. Solar Energy, 78(4), 483-494.

[12] Chang, S. W., Jan, Y. J., & Liou, J. S. (2007). Turbulent Heat Transfer and Pressure Drop in Tube Fitted with Serrated Twisted Tape. Int. J. Thermal Sci., 46(5), 506-523.

[13] Shaikh, N., & Siddiqui, M. (2007). Heat Transfer Augmentation in a Heat Exchanger Tube Using a Baffle. Int. J. Heat Fluid Flow, 28(2), 318-328.

[14] Naphon, P. (2006). Effect of Coil-Wire Insert on Heat Transfer Enhancement and Pressure Drop of Horizontal Concentric Tubes. Int. Communication Heat Mass Transfer, 33(6), 753-63.

[15] Garcı´a, A., Solano, J. P., Vicente, P. G., & Viedma, A. (2007). Enhancement of Laminar and Transitional Flow Heat Transfer in Tubes by Means of Wire Coil Inserts. Int J Heat Mass Transfer, 50(15–16), 3176–89.

[16] Ozceyhan, V. (2005). Conjugate Heat Transfer and Thermal Stress Analysis of Wire Coil Inserted Tubes That Are Heated Externally with Uniform Heat Flux. Energy Conversion and Management, 46(9-10), 1543-1559.

[17] Kim, H., Koyama, S., & Matsumoto, W. (2001). Flow Pattern and Flow Characteristics for Counter-Current Two-Phase Flow in a Vertical Round Tube with Wire Coil Insert. Int. J Multiphase Flow, 27(12), 2063-2081.

[18] Ozceyhan, V., Gunes, S., Buyukalaca, O., & Altuntop, N. (2008). Heat Transfer Enhancement in a Tube Using Circular Cross Sectional Rings Separated from Wall. Applied Energy, 85(10), 988-1001.

[19] Ibrahim, E. Z. (2011). Augmentation of Laminar Flow and Heat Transfer in Flat Tubes by Means of Helical Screw-Tape Inserts. Energy Conversion and Management, 52(1), 250-257.

[20] Incropera, F., & Dewitt, P. (1996). Introduction to Heat Transfer (3rd ed.). London: John Wiley & Sons Inc.

[21] ANSI/ASME. (1986). Measurement Uncertainty Part I (PTC 19, pp. 1-1985).




DOI: http://dx.doi.org/10.3968%2Fj.est.1923847920120402.549

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