Simulation of Turbulent Heat Transfer in a Tube Fitted with Twisted Tape Placed Separately from the Tube Walls

Abstract:

The effects of loose-fit twisted tape (LFT) on the heat transfer rate, friction factor, fluid phenomena and thermal performance of a tube under constant wall temperature are examined. It is observed that apart from the rise of Reynolds number, the reduction of the clearance ratio (c/D) leads to an increase in the heat transfer and pressure loss. According to the numerical results, the heat transfer and friction factor in the tubes with loose-fit twisted tape (LFT) for the smallest clearance ratio of c/D = 0.05 are higher those other clearance ratios. In addition, the thermal performances of clearance ratio c/D = 0.05 are found to be higher than those other clearance ratios (c/D) for all Reynolds numbers examined.

• Periodical: Applied Mechanics and Materials (Volume 751)
• Pages: 245-250
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.751.245
• Online since: April 2015
• Authors: Niwat Piriyarungroj*, Smith Eiamsa-ard, Pongjet Promvonge, Petpices Eiamsa-Ard, Chinaruk Thianpong
• Keywords: Heat Transfer, Loose-Fit Twisted Tape, Swirl Flow, Twisted Tape

References

[1] X. Zhang, Z. Liu and W. Liu, Numerical studies on heat transfer and flow characteristics for laminar flow in a tube with multiple regularly spaced twisted tapes, International Journal of Thermal Sciences 58 (2012) 157-167.

DOI: 10.1016/j.ijthermalsci.2012.02.025

[2] J. Guo, A. Fan, X. Zhang and W. Liu, 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 (2011) 1263-1270.

DOI: 10.1016/j.ijthermalsci.2011.02.010

[3] S. Pal and S.K. Saha, Laminar flow and heat transfer through a circular tube having integral transverse corrugations and fitted with centre-cleared twisted-tape, Experimental Thermal and Fluid Science 57 (2014) 388-395.

DOI: 10.1016/j.expthermflusci.2014.06.008

[4] S. Eiamsa-ard, K. Wongcharee and S. Sripattanapipat, 3-D Numerical simulation of swirling flow and convective heat transfer in a circular tube induced by means of loose-fit twisted tapes, International Communications in Heat and Mass Transfer 36 (2009).

DOI: 10.1016/j.icheatmasstransfer.2009.06.014

[5] H. Bas and V. Ozceyhan, Heat transfer enhancement in a tube with twisted tape inserts placed separately from the tube wall, Experimental Thermal and Fluid Science 41 (2012) 51-58.

DOI: 10.1016/j.expthermflusci.2012.03.008