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Experimental study of the turbulent convective heat transfer of titanium oxide nanofluid flowing inside helically corrugated tubes

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Abstract

The convective heat transfer for the turbulent flow of water/TiO2 nanofluid inside helically horizontal corrugated tubes is investigated in this paper using experimental techniques. The tube boundary condition is a uniform wall temperature. The test apparatus was designed and assembled with a test section containing 93 cm copper tubes with internal and external diameters of 7.71 mm and 9.52 mm, respectively. First, the heat transfer characteristics of the distilled water turbulent flow in a plain copper tube were measured preliminarily. Second, various test runs were performed for nanofluids with two nanoparticle concentrations (0.1% and 0.5%), two corrugation depth to diameter ratios (0.0648 and 0.103), two corrugation pitch to diameter ratios (0.917 and 1.297), and two corrugation width to diameter ratios (0.363 and 0.492) that were all within the range of turbulent Reynolds numbers (3000 < Re < 15000). The experimental results reveal that the Nusselt number augments the dual increments in corrugation depth and width and with the decrements in corrugation pitch, particularly for high Reynolds numbers. The nanoparticles have a stronger effect on the heat transfer in helically corrugated tubes with higher corrugation depths and widths as well as lower corrugation pitches. A correlation for the Nusselt number in terms of the helically corrugated tubes is introduced based on the linear regression analysis of the experimental data.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran

    Mohammad Reza Salimpour, Kia Golmohammadi & Ahmad Sedaghat

  2. Department of Mechanical Engineering, The University of Texas at San Antonio, San Antonio, TX, 78249, USA

    Antonio Campo

Authors
  1. Mohammad Reza Salimpour
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  2. Kia Golmohammadi
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  3. Ahmad Sedaghat
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  4. Antonio Campo
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Corresponding author

Correspondence to Mohammad Reza Salimpour.

Additional information

Recommended by Associate Editor Dae Hee Lee

Mohammad Reza Salimpour is an Associate Professor at the Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, Iran. He received his B.Sc., M.Sc., and Ph.D. in Mechanical Engineering from the University of Tehran in 2001, 2003, and 2007, respectively. His major research areas include constructal design, electronics cooling, twophase flow heat transfer, and thermodynamic design.

Kia Golmohammadi received his B.Sc. and M.Sc. in Mechanical Engineering from Guilan University, Rasht, Iran and Isfahan University of Technology, Isfahan, Iran in 2011 and 2013, respectively. His major research areas include heat transfer, nanofluidics, and numerical and experimental methods.

Ahmad Sedaghat obtained his Ph.D. from the Department of Aerospace Engineering of the University of Manchester, United Kingdom in 1998. In 2004, he was appointed as an Assistant Professor at Isfahan University of Technology in Iran. Dr. Sedaghat is a reviewer and an editorial board member of several international journals in the field of renewable energy, aerodynamics of wind turbines, and heat transfer.

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Salimpour, M.R., Golmohammadi, K., Sedaghat, A. et al. Experimental study of the turbulent convective heat transfer of titanium oxide nanofluid flowing inside helically corrugated tubes. J Mech Sci Technol 29, 4011–4016 (2015). https://doi.org/10.1007/s12206-015-0847-x

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  • DOI: https://doi.org/10.1007/s12206-015-0847-x

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