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Optimal selection of annulus radius ratio to enhance heat transfer with minimum entropy generation in developing laminar forced convection of water-Al2O3 nanofluid flow

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An Erratum to this article was published on 01 October 2017

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Abstract

Heat transfer and entropy generation of developing laminar forced convection flow of water-Al2O3 nanofluid in a concentric annulus with constant heat flux on the walls is investigated numerically. In order to determine entropy generation of fully developed flow, two approaches are employed and it is shown that only one of these methods can provide appropriate results for flow inside annuli. The effects of concentration of nanoparticles, Reynolds number and thermal boundaries on heat transfer enhancement and entropy generation of developing laminar flow inside annuli with different radius ratios and same cross sectional areas are studied. The results show that radius ratio is a very important decision parameter of an annular heat exchanger such that in each Re, there is an optimum radius ratio to maximize Nu and minimize entropy generation. Moreover, the effect of nanoparticles concentration on heat transfer enhancement and minimizing entropy generation is stronger at higher Reynolds.

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Change history

  • 11 November 2017

    Authors’ first and last names were interchanged in the original version of the article and they should be replaced as follows: Majid Siavashi, Mohammad Jamali.

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Authors and Affiliations

  1. Applied Multi-Phase Fluid Dynamics Lab., School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran

    Siavashi Majid & Jamali Mohammad

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  1. Siavashi Majid
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  2. Jamali Mohammad
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Correspondence to Siavashi Majid.

Additional information

An erratum to this article is available at https://doi.org/10.1007/s11771-017-3660-0.

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Majid, S., Mohammad, J. Optimal selection of annulus radius ratio to enhance heat transfer with minimum entropy generation in developing laminar forced convection of water-Al2O3 nanofluid flow. J. Cent. South Univ. 24, 1850–1865 (2017). https://doi.org/10.1007/s11771-017-3593-7

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  • DOI: https://doi.org/10.1007/s11771-017-3593-7

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