Thermal Behaviors in a Square Duct with U-Ribbed Tape Inserts

Abstract:

This paper presents an experimental study on thermal characteristics in a constant heat-fluxed square-duct heat exchanger with U-ribbed tape inserts. The experiments are carried out by varying airflow rate for Reynolds number ranging from 4000 to 38,000. The insertion of the U-ribbed tape is performed with an axial rib-pitch set to four times duct-height (4H) at a single attack angle, α=45° and the ribbed tape is diagonally inserted in the square duct in order to generate longitudinal vortex flows. Effects of five blockage ratios (e/H=0.1, 0.15, 0.2, 0.25 and 0.3) on heat transfer and friction loss are experimentally investigated. The experimental result shows that the insertion of the U-ribbed tape at e/H=0.3 provides the highest heat transfer and friction factor values but the one at e/H=0.25 yields the highest thermal performance enhancement.

• Periodical: Advanced Materials Research (Volumes 931-932)
• Pages: 1208-1212
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.931-932.1208
• Online since: May 2014
• Authors: Chitakorn Khanoknaiyakarn, Sompol Skullong, Pongjet Promvonge*, Nuthvipa Jayranaiwachira
• Keywords: Friction Factor, Heat Transfer, Square Duct, Thermal Behavior, U-Shaped Ribs

References

[1] J.C. Han, Y.M. Zhang and C.P. Lee, Augmented heat transfer in square channels with parallel, crossed and V-shaped angled ribs, ASME. Heat Transfer., 113 (1991) 590–596.

DOI: 10.1115/1.2910606

[2] J.C. Han, Y.M. Zhang and C.P. Lee, Influence of surface heat flux ratio on heat transfer augmentation in square channels with parallel, crossed, and V-shaped angled ribs, ASME. J. Turbomach., 114 (1992) 872–880.

DOI: 10.1115/1.2928042

[3] G. Tanda, Heat transfer in rectangular channels with transverse and V-shaped broken ribs, Int. J. Heat Mass Transfer, 47 (2004) 229–243.

DOI: 10.1016/s0017-9310(03)00414-9

[4] P. Promvonge, Thermal performance in circular tube fitted with coiled square wires, Energy Conver. Manage. , 49 (2008) 980–987.

DOI: 10.1016/j.enconman.2007.10.005

[5] T. Chompookham, C. Thianpong, S. Kwankaomeng and P. Promvonge, Heat transfer augmentation in a wedge-ribbed channel using winglet vortex generators, Int. Commun. Heat Mass Transfer, 37 (2010) 163–169.

DOI: 10.1016/j.icheatmasstransfer.2009.09.012

[6] P. Promvonge, S. Skullong, S. Kwankaomeng and C. Thiangpong, Heat transfer in square duct fitted diagonally with angle-finned tape–Part 1: Experimental study, Int. Commun. Heat Mass Transfer, 39 (2012) 617-624.

DOI: 10.1016/j.icheatmasstransfer.2012.03.007

[7] P. Promvonge, S. Skullong, S. Kwankaomeng and C. Thiangpong, Heat transfer in square duct fitted diagonally with angle-finned tape–Part 2: Numerical study, Int. Commun. Heat Mass Transfer, 39 (2012) 625-633.

DOI: 10.1016/j.icheatmasstransfer.2012.03.010

[8] S. Eiamsa-ard, N. Koolnapadol and P. Promvonge, Heat transfer behavior in a square duct with tandem wire coil element insert, Chin. J. Chem. Eng., 20 (2012) 863-869.

DOI: 10.1016/s1004-9541(12)60411-x

[9] ANSI/ASME, Measurement uncertainty, PTC 19, 1–1985. Part I, (1986).

[10] Incropera, F.P., Dewitt, P.D., Bergman, T.L. and Lavine, A.S., Introduction to heat transfer, 5th edition, John Wiley & Sons Inc., (2006).