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Title: Numerical heat transfer modelling of staggered array impinging jets
Authors: Ramezanpour, Ahad
Mirzaee, Iraj
Rahmani, Ramin
Shirvani, Hassan
Issue Date: 2006
Publisher: © WIT Press
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.
Abstract: 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.
Description: This is a conference paper. Courtesy of WIT Press from WIT Transactions on Engineering Sciences, 53, pp. 361 - 369.
Version: Published
DOI: 10.2495/HT060351
URI: https://dspace.lboro.ac.uk/2134/20515
Publisher Link: http://dx.doi.org/10.2495/HT060351
ISBN: 1845641760
ISSN: 1743-3533
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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