Heat transfer enhancement in tubular heat exchanger with double V-ribbed twisted-tapes

Citations of this article
Mendeley users who have this article in their library.


An experimental work on heat transfer enhancement in a round tube by insertion of double twisted tapes in common with 30° V-shaped ribs has been conducted. Air as the test fluid flowed through the test tube having a constant wall heat-flux with Reynolds number (Re) from 5300 to 24,000. The combined vortex generators (called "V-ribbed twisted tape") were obtained by incorporating V-shaped ribs into the edges of double co-twisted tapes having a similar twist ratio of 4. The effect of pertinent V-rib parameters such as four relative rib heights, (called "blockage ratio", BR=b/D= 0.07, 0.09, 0.14 and 0.19) and a relative rib pitch, (PR=P/D=1.9) at an attack angle of rib, α=30° on thermal characteristics was investigated. The experimental results reveal that the heat transfer and pressure drop in terms of the respective Nusselt number and friction factor for the V-ribbed twisted tapes show the increasing trend with the rise of Re and BR. The V-ribbed twisted tape with BR=0.19 yields the highest heat transfer and friction factor. However, the maximum thermal enhancement factor is about 1.4 for the V-ribbed twisted tape at BR=0.09 but is around 1.09 for the twisted tape with no rib.




Tamna, S., Kaewkohkiat, Y., Skullong, S., & Promvonge, P. (2016). Heat transfer enhancement in tubular heat exchanger with double V-ribbed twisted-tapes. Case Studies in Thermal Engineering, 7, 14–24. https://doi.org/10.1016/j.csite.2016.01.002

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free