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Perforated fins effect on the heat transfer rate from a circular tube by using wind tunnel: An experimental view

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Abstract

Perforated fins effects on the heat transfer rate of a circular tube are examined experimentally. An experimental system is set up through the wind tunnel and equipped with necessary measurement tools. Hot water passes through the finned tube and heat transfers to the fin-side air created using the wind tunnel with different velocities. Two fin sets of identical weight are installed on a circular tube with different outer diameters of 22 and 26 mm. The experiments are conducted at two different mass flow rates of the hot water and six Reynolds number of external air flow. Considering the four finned tubes and one no finned tube, a total of 60 tests are conducted. Results showed that with increasing the internal or external flow rates, the effect of larger cross-sectional area is greater. By opening holes on the fins, in addition to weight loss, the maximum heat transfer rate for perforated fins increases by 8.78% and 9.23% respectively for mass flow rates of 0.05 and 0.1 kg/s at low external Reynolds number. While, at high external Reynolds number, the holes reduces heat transfer by 8.4% and 10.6% for mass flow rates of 0.05 and 0.1 kg/s, respectively.

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Authors and Affiliations

  1. Engineering Faculty, Shahrekord University, Shahrekord, Iran

    Afshin Ahmadi Nadooshan

  2. Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran

    Rasool Kalbasi & Masoud Afrand

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  1. Afshin Ahmadi Nadooshan
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  2. Rasool Kalbasi
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  3. Masoud Afrand
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Correspondence to Afshin Ahmadi Nadooshan.

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Appendix

Appendix

Based on Kline and McClintock method [50], the error in measurement of parameter “y = f(x1, x2, …)” is given as follows:

$$ \mathrm{dy}=\sqrt[2]{{\left[\frac{\mathrm{\partial f}}{\partial {\mathrm{x}}_1}\ \mathrm{d}{\mathrm{x}}_1\right]}^2+{\left[\frac{\mathrm{\partial f}}{\partial {\mathrm{x}}_2}\ \mathrm{d}{\mathrm{x}}_2\right]}^2+\dots } $$

where dx1, dx2, … are errors in the measurement of x1, x2,… the uncertainty of area, water mass flow rate, Reynolds number, heat transfer, dimensionless temperature and total thermal resistance are calculated by the following formulations:

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Ahmadi Nadooshan, A., Kalbasi, R. & Afrand, M. Perforated fins effect on the heat transfer rate from a circular tube by using wind tunnel: An experimental view. Heat Mass Transfer 54, 3047–3057 (2018). https://doi.org/10.1007/s00231-018-2333-3

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