DOI : https://doi.org/10.18517/ijaseit.1.1.13

Performance Comparison of Twisted Tape and Screw Tape Inserts in Square Duct

Suhas Vinaya Patil (1), Pinjala Vijay Babu (2)
(1) Department of Chemical Engineering, Dr. Babasaheb Ambedkar Technological University, P.O. Lonere, Mangaon, Raigad, Maharashtra
(2) Department of Chemical Engineering, Dr. Babasaheb Ambedkar Technological University, P.O. Lonere, Mangaon, Raigad, Maharashtra
Fulltext View | Download
How to cite (IJASEIT) :
Patil, Suhas Vinaya, and Pinjala Vijay Babu. “Performance Comparison of Twisted Tape and Screw Tape Inserts in Square Duct”. International Journal on Advanced Science, Engineering and Information Technology, vol. 1, no. 1, Feb. 2011, pp. 50-55, doi:10.18517/ijaseit.1.1.13.
Citation Format :
Effects of insertion of a full length twisted tape and full length screw tape insert in a concentric double pipe heat exchanger ,square duct inner, and circular annulus on heat transfer and pressure drop characteristics were experimentally studied. Experiments were carried out under constant wall temperature using water as working fluid. Stainless steel twisted tape and screw tape inserts have equal twist ratio(y=4.0).Cold water flows through inner square duct, and hot water flows through circular annulus, in counter current fashion. Screw tape inserts found better over twisted tape from thermal performance point of view. Results of the Isothermal friction factor for the present twisted tape and helical screw-tape are higher than those for the plain duct around 7.7 times and 14 times respectively. Experiments were conducted well within laminar region. Over entire investigated laminar range, mean Nusselt number for the present twisted tape and helical screw tape are higher than those for the plain duct around 2.85 times and 5.3 times respectively. Further, Thermal performance ratio of twisted tape and screw tape inserts were found 2.81 and 3.52 times the plain square duct on constant pumping power respectively.

Authors who publish with this journal agree to the following terms:

    1. Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
    2. Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
    3. Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).