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    Effects of mesh grid and turbulence models on heat transfer coefficient in a convergent-divergent nozzle

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    Publication date
    2014
    Author
    Zhalehrajabi, E.
    Rahmanian, Nejat
    Hasan, N.
    Keyword
    Turbulence model
    ; Heat transfer coefficient
    ; Convergent-divergent nozzle
    ; CFD
    ; Ansys-CFX
    Peer-Reviewed
    Yes
    
    Metadata
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    Abstract
    The results of computational fluid dynamics simulation for convective heat transfer of turbulent flow in a cooled convergent-divergent nozzle are reported. The importance of the heat transfer coefficient is to find the most suitable metals for the nozzle wall as well as its application for producing nano-particles. ansys-icem and ansys-cfx 13.0 are used to mesh and simulate fluid flow in the nozzle, respectively. Effects of grid resolution and different turbulence models on the heat transfer coefficient are investigated. Three turbulence models of k-omega, k-epsilon and shear stress transport are applied to calculate the heat transfer coefficient. Stagnation absolute pressure and temperature are 10.3 bara and 840 K, respectively, the same as those in the experimental work. The heat transfer coefficients obtained from simulation are compared with the available experimental data in literature to find out the best suitable mesh grid and the turbulence model. Under the selected operating conditions, k-epsilon and k-omega models have shown the best agreement with the experimental data with the average error of 6.5% and 10%, respectively, while shear stress transport under predicts the values with 16% error.
    URI
    http://hdl.handle.net/10454/10826
    Version
    No full-text in repository
    Citation
    Zhalehrajabi E, Rahmanian N and Hasan N (2014) Effects of mesh grid and turbulence models on heat transfer coefficient in a convergent-divergent nozzle. Asia-Pacific Journal of Chemical Engineering. 9(2): 265-271.
    Link to publisher’s version
    https://doi.org/10.1002/apj.1767
    Type
    Article
    Collections
    Engineering and Informatics Publications

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