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CFD study of forced convective heat transfer enhancement in a 90° bend duct of square cross section using nanofluid

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Abstract

In this paper, the forced convective heat transfer enhancement with nanofluids in a 90° pipe bend has been presented. Numerical investigation is carried out for the turbulent flow through the pipe employing finite volume method. The governing differential equations are discretized using hexahedral cells, and the resulting algebraic equations are solved using Commercial solver Fluent 6.3. In order to close the time averaged Navier–Stokes equations, the two-equation k–ɛ turbulence model with a standard wall function have been used. The duct Reynolds number is varied in the range of 2,500–6,000. It is observed that the heat transfer is enhanced significantly by varying the volume fraction of the nanofluid. It is also found that the heat transfer is increased with Reynolds number. A strong secondary flow is observed due to the presence of the wall. Turbulent kinetic energy near outer wall is found to be higher than the inner wall of the bend. A comparative assessment for the heat transfer enhancement with different types of nanofluids is also presented. The computed results of area weighted average Nusselt numbers are validated with some of the existing literature.

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Authors and Affiliations

  1. Department of Mechanical Engineering, College of Engineering and Technology, Bhubaneswar, 751003, Odisha, India

    Ashok K Barik, Prasanta K Satapathy & Sudhansu S Sahoo

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  1. Ashok K Barik
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  2. Prasanta K Satapathy
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  3. Sudhansu S Sahoo
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Correspondence to Ashok K Barik.

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Barik, A.K., Satapathy, P.K. & Sahoo, S.S. CFD study of forced convective heat transfer enhancement in a 90° bend duct of square cross section using nanofluid. Sādhanā 41, 795–804 (2016). https://doi.org/10.1007/s12046-016-0507-6

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  • DOI: https://doi.org/10.1007/s12046-016-0507-6

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