Numerical Heat Transfer Modelling Of Staggered
Array Impinging Jets
Author(s)
A. Ramezanpour, I. Mirzaee, R. Rahmani & H. Shirvani
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 Sp/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.
Keywords: bundle of impinging jets, jet to jet interaction, RNG k-ε, enhanced
wall treatment.
Keywords
bundle of impinging jets, jet to jet interaction, RNG k-ε, enhanced
wall treatment.
Related Book
Other papers in this volume
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