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Numerical heat transfer modelling of staggered array impinging jets

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conference contribution
posted on 09.03.2016 by Ahad Ramezanpour, Iraj Mirzaee, Ramin Rahmani, Hassan Shirvani
A numerical study of flow field and heat transfer rate in external flow of a novel heat exchanger (Anglia Ruskin University, 2001) was conducted. The design comprises of confined impinging jets from a staggered bundle of tubes in which the fluid flows in an opposite staggered arrangement array after impingement. The RNG k-ε model and enhanced wall treatment near wall turbulence modelling was applied to model a three-dimensional computational domain. The accuracy of the model was validated in two- and three-dimensional cases for single impinging jets with available experimental results. The arrangement of the staggered array was fixed Sn/D=2.1 and S p/D=1.6 where Sn and Sp are the distances between tubes transverse and parallel to fluid flow respectively and D was the hydraulic diameter of tubes. The dimensionless tubes to impinging surface distance (H/D) were in the range of 0.2, 0.5, 1.0, and 2.0 and the Reynolds number based on the tubes' hydraulic diameter and average fluid velocity at the exit of tubes in the range of 1000, 5000, and 20000 were studied. The global heat transfer rate on both impinging and confinement plates increased with decreasing of H/D and increasing of Reynolds number; however, the slope of increasing Reynolds number was sharper in low H/Ds. The friction factor increased with a decreasing H/D and an increasing of the Reynolds number. The local Nusselt number was studied on both impinging and confinement plates. The temperature contours and velocity vectors are also presented.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

WIT Transactions on Engineering Sciences

Volume

53

Pages

361 - 369

Citation

RAMEZANPOUR, A. ... et al., 2006. Numerical heat transfer modelling of staggered array impinging jets. IN: WIT Transactions on Engineering Sciences, Volume 53, Southampton: Wit Press, pp. 361 - 369.

Publisher

© WIT Press

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2006

Notes

This is a conference paper. Courtesy of WIT Press from WIT Transactions on Engineering Sciences, 53, pp. 361 - 369.

ISBN

1845641760;9781845641764

ISSN

1743-3533

Language

en

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