A Numerical Study Of Heat Transfer And Fluid
Flow Over An In-line Tube Bank
Author(s)
Z. S. Abdel-Rehim
Abstract
Heat transfer and fluid flow over an in-line tube bank using a computational fluid
dynamic (CFD) prediction is presented in this study. The study considers steady
laminar two-dimensional incompressible flow over in-line tube bundles used in
heat exchanger applications. The effect of various independent parameters, such
as Reynolds number (Re), length aspect ratio (L/D = 2.5, 2, 1.5, 1.0, 0.5 and 0.0),
and fluid flow on the pressure drop and heat transfer is studied. A computer code
(CFD-Fluent) is used, generally, to predict the heat transfer and pressure drop
characteristics of flows around or through rigid complex geometry, namely
domains whose boundaries do not coincide with coordinate lines of a Cartesian
or any simple coordinate system.
A comparison is made between the present CFD predictions and reference
measurements (Iwaki, et al. PIV Measurement of Vertical Cross Flow Structure
over Tube Bundles, Experiments in Fluids, 2004) for the velocity vector as fluid
flow over a cylinder in cross flow for the selected values of Reynolds numbers
ReD. Therefore, the comparison is made between the present CFD results and
Martin empirical correlation of an in-line circular tube for the variation of Nu
with ReD. A reasonable agreement is observed. The results of the present study
provide sufficient confidence in using empirical correlations to undertake initial
sizing of tube bank heat exchanger design, with thermo-fluid performance
subsequently predicted by CFD analysis for specific requirement applications.
Keywords: CFD prediction, fluid flow, in-line arrangement, laminar flow, length
aspect ratio, tube bank.
1 Introduction
Heat transfer enhancement is the process of improving the performance of a heat
transfer system by increasing the heat transfer coefficient. Flat tubes have not
Keywords
CFD prediction, fluid flow, in-line arrangement, laminar flow, length
aspect ratio, tube bank
Related Book
Other papers in this volume
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