The goal of this investigation is to obtain definitive information about the heat transfer characteristics of circular coil-spring turbulators. This is achieved by measuring the wall temperatures on the inner tube of the exchanger. Also the inlet and outlet temperatures and pressure loss of the fluid are measured. These results are parametrized by Reynolds numbers , outer diameters of the springs (, 9.5 mm, 12 mm, and 13 mm), numbers of the springs (, 5, and 6), and the incline angles of the springs (, 7 deg, and 10 deg). Additionally, another goal of this work is to quantify the friction factor of the turbulated heat exchanger system with respect to aforementioned parametric values. As a result, it is found that increasing spring number, spring diameter, and incline angle result in significant augmentation on heat transfer, comparatively 1.5–2.5 times of the results of a smooth empty tube. By the way, friction factor increases 40–80 times of the results found for a smooth tube. Furthermore, as a design parameter, the incline angle has the dominant effect on heat transfer and friction loss while spring number has the weakest effect.
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e-mail: haydar@firat.edu.tr
e-mail: nevincelik23@gmail.com
e-mail: seybayildiz@yahoo.com
e-mail: adurmus@omu.edu.tr
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Heat Transfer and Friction Factor of Coil-Springs Inserted in the Horizontal Concentric Tubes
Haydar Eren,
Haydar Eren
Department of Mechanical Engineering,
e-mail: haydar@firat.edu.tr
University of Firat
, Elazig 23119, Turkey
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Nevin Celik,
Nevin Celik
Department of Mechanical Engineering,
e-mail: nevincelik23@gmail.com
University of Minnesota
, MN 55455
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Seyba Yildiz,
Seyba Yildiz
Department of Mechanical Engineering,
e-mail: seybayildiz@yahoo.com
University of Firat
, Elazig 23119, Turkey
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Aydın Durmus
Aydın Durmus
Department of Mechanical Engineering,
e-mail: adurmus@omu.edu.tr
University of Ondokuz Mayis
, Samsun 55139, Turkey
Search for other works by this author on:
Haydar Eren
Department of Mechanical Engineering,
University of Firat
, Elazig 23119, Turkeye-mail: haydar@firat.edu.tr
Nevin Celik
Department of Mechanical Engineering,
University of Minnesota
, MN 55455e-mail: nevincelik23@gmail.com
Seyba Yildiz
Department of Mechanical Engineering,
University of Firat
, Elazig 23119, Turkeye-mail: seybayildiz@yahoo.com
Aydın Durmus
Department of Mechanical Engineering,
University of Ondokuz Mayis
, Samsun 55139, Turkeye-mail: adurmus@omu.edu.tr
J. Heat Transfer. Jan 2010, 132(1): 011801 (11 pages)
Published Online: October 30, 2009
Article history
Received:
December 29, 2008
Revised:
June 19, 2009
Published:
October 30, 2009
Citation
Eren, H., Celik, N., Yildiz, S., and Durmus, A. (October 30, 2009). "Heat Transfer and Friction Factor of Coil-Springs Inserted in the Horizontal Concentric Tubes." ASME. J. Heat Transfer. January 2010; 132(1): 011801. https://doi.org/10.1115/1.3194771
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