Thermal characterization in circular tube inserted with diamond-shaped rings

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Published: Jun 27, 2019
Keywords:
Diamond rings Heat exchanger Vortex generators Thermal performance

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P. Promthaisong
Department of Mechanical Engineering, Faculty of Engineering, Mahanakorn University of Technology, Bangkok 10530, Thailand
S. Skullong
Department of Mechanical Engineering, Faculty of Engineering at Sriracha, Kasetsart University Sriracha Campus, 199 M.6, Sukhumvit Rd., Sriracha, Chonburi 20230, Thailand

Abstract

The article presents the influence of diamond-shaped rings (DRs) mounted repeatedly in a uniform heat-fluxed heat exchanger tube on flow resistance and thermal behaviors. In the current study, the DR elements used for producing the longitudinal vortex flows were placed in the tube by employing two small rods to connect the DRs together. Effects of three relative ring-pitches or pitch ratios (RP = P/D = 0.5, 1.0, 2.0) and three ring blockage ratios (RB = b/D = 0.1, 0.15 and 0.2) at the attack angle of 45° on Nusselt number (Nu), friction factor (f) and thermal enhancement factor (TEF) in turbulence regimes, Reynolds number (Re) between 4220–25,800 are examined. The results have shown that the heat transfer and pressure loss increase considerably with raising RB but with the decline of RP. The maximum Nu and f obtained at RB = 0.2 and RP = 0.5 are, respectively, about 3.21–4.18 and 11.73–32.85 times above the smooth tube. The highest TEF around 1.57 is seen at RB = 0.10 and RP = 1.0. Furthermore, empirical correlations for Nu, f and TEF were established and found to fit the experimental data with deviations within ±8%, ±9% and ±5%, respectively.

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How to Cite
Promthaisong, P., & Skullong, S. (2019). Thermal characterization in circular tube inserted with diamond-shaped rings. Journal of Research and Applications in Mechanical Engineering, 7(1), 1–10. Retrieved from https://ph01.tci-thaijo.org/index.php/jrame/article/view/174289
Issue
Vol. 7 No. 1 (2019)
Section
RESEARCH ARTICLES

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