Effect of Twisted Tape Inserts On Heat Transfer in A Concentric Tube Heat Exchanger

  Mukesh P Mangtani,  Prof.K.M.Watt

Work presents the effects of twisted tape inserts of different materials and different twist ratio on the performance of concentric double pipe heat exchanger by using air and water as working medium. The twisted tape inserts when placed in the path of the flow of the fluid, create a high degree of turbulence resulting in an increase in the heat transfer rate. The twisted tapes of copper and aluminium are used for experiment with two different configuration of each twisted tape, one having twist ratio (y/D) =5 and other having (y/D) =7. The results shows that the heat transfer rate of heat exchanger with the twisted-tape inserts is found to be strongly influenced by tape-induced swirl or vortex motion. It is found experimentally the heat transfer coefficient and nusselt number in a heat exchanger with copper twisted tape is higher by 9% and 9.5% than that of aluminum twisted tape. Nusselt number depends on rate of heat transfer and thermal conductivity for different material of twisted tape. The values of Nusselt number for copper material is higher than for aluminium because of higher thermal conductivity of copper and it is also denser as compared to aluminum and keeps heat maximum.

Keywords- Concentric tube, Heat transfer, twisted tape with copper and aluminium and Friction factor.

Unique Identification Number - IJEDR1604082
Page Number(s) - 563-568
Pubished in - Volume 4 | Issue 4 | November 2016
DOI (Digital Object Identifier) -   
Publisher - IJEDR (ISSN - 2321-9939)

  Mukesh P Mangtani,  Prof.K.M.Watt,   "Effect of Twisted Tape Inserts On Heat Transfer in A Concentric Tube Heat Exchanger", International Journal of Engineering Development and Research (IJEDR), ISSN:2321-9939, Volume.4, Issue 4, pp.563-568, November 2016, Available at :http://www.ijedr.org/papers/IJEDR1604082.pdf