Experimental Investigations on Heat Transfer Enhancement in a Horizontal Tube Using Converging and Diverging Conical Strip Inserts

Abstract:

The present work deals with the results of the experimental investigations carried out on augmentation of turbulent flow heat transfer in a horizontal circular tube by means of tube inserts, with air as working fluid. Experiments were carried out initially for the plain tube (without tube inserts). The Nusselt number and friction factor obtained experimentally were validated against those obtained from theoretical correlations. Secondly experimental investigations using three kinds of tube inserts namely Rectangular bar with diverging conical strips, Rectangular bar with converging conical strips, Rectangular bar with alternate converging diverging conical strips were carried out to estimate the enhancement of heat transfer rate for air in the presence of inserts. The Reynolds number ranged from 8000 to 19000. In the presence of inserts, Nusselt number and pressure drop increased, overall enhancement ratio is calculated to determine the optimum geometry of the tube insert. Based on experimental investigations, it is observed that, the enhancement of heat transfer using Rectangular bar with converging and diverging conical strips is more effective compared to other inserts. Key words: Heat transfer, enhancement, turbulent flow, conical strip inserts, friction factor, pressure drop.

• Periodical: Applied Mechanics and Materials (Volumes 592-594)
• Pages: 1590-1595
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.592-594.1590
• Online since: July 2014
• Authors: Ravi G, Sri Rama R. Devi, Ravi Gugulothu
• Keywords: Conical Strip Inserts, Enhancement, Friction Factor, Heat Transfer, Pressure Drop, Turbulent Flow

References

[1] S.S. Joshi, V.M. Kriplani, Experimental Study of Heat Transfer in Concentric tube Heat Exchanger with Inner twisted tape and Annular insert, International Journal of Advanced Engineering Sciences And Technologies, Vol. 10, Issue No. 2, (2011).

[2] M.A.K. Chowdhuri, R.A. Hossain, M.A.R. Sarkar, An experimental investigation of turbulent flow heat transfer through tube with rod-pin insert, International Journal of Engineering, Science and Technology. Vol. 3, No. 4, 2011, pp.76-81.

DOI: 10.4314/ijest.v3i4.68543

[3] P. Selvaraj, J. Sarangan,S. Suresh, Experimental investigation on heat transfer and friction factor characteristics of a water and ethylene glycol mixture flow of internally grooved tubes, International Journal of Chemical Research, Vol. 3, Issue 1, 2011, pp.33-40.

DOI: 10.9735/0975-3699.3.1.33-40

[4] KhwanchitWongcharee, Smith Eiamsa-ard, Enhancement of heat transfer using CuO/water nanofluid and twisted tape with alternate axis, International Communications in Heat and Mass Transfer, Volume 38, March 2011, pp.742-748.

DOI: 10.1016/j.icheatmasstransfer.2011.03.011

[5] B. Turan, H.F. Oztop, Analysis of Heat Transfer in A Heated Tube with A Different Shaped Disc Insertation, International Advanced Technologies Symposium (IATS'11), 16-18, May 2011, pp.303-307.

[6] Bodius Salam, Sumana Biswas, Shuvra Saha, Muhammad Mostafa K Bhuiya, Heat transfer enhancement in a tube using rectangular-cut twisted tape insert, Procedia Engineering 56 ( 2013 ) 96 – 103.

DOI: 10.1016/j.proeng.2013.03.094