Numerical Simulation of Low Reynolds Number Flows in In-Line Tube Banks

Present study involves experimental and numerical work to investigate the effect of integral wake splitter towards the overall performance of cross-flow, circular tube, heat exchanger system. The experimental work was conducted to obtain local distribution of pressure coefficient around plain tube bank of staggered arrangement which was subjected to a cross-flow of air with Reynolds number of 15950. The numerical work consisted of 2-dimensional unsteady numerical simulation which was validated against the experimental data. The validated numerical approach was utilized to simulate cross-flow around similar tube bank but with integral wake splitter of length-to-diameter ratio of 0.5, 1, 1.5 and 2, at Reynolds number between 5000 to 50000. It is concluded that integral wake splitter is able to reduce pressure loss, which in turn reduces power requirement of a blower, which is intended in effort to increase the system efficiency. Splitter which acts as fin may improve the overall performance of the system by enhancing total heat removal via extended surface provided that certain value of fin efficiency is achieved.

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Hydrodynamic Characteristics of Flow around Tube Bank with Integral Wake Splitter

Seri

Karim

Salleh

et al. 2014

AMM

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Abstract.This paper reports the effects of a longitudinal plate attached at the backward stagnation point of a bank of tubes on the local static pressure distribution. The longitudinal plate is termed as an integral wake splitter. Investigations on hydrodynamic characteristics of tube banks with integral wake splitter were carried out in cross flow of air in a rectangular duct at a Reynolds number of 15950. The integral wake splitter length-to-tube-diameter ratios studied were 0.5, 1.0, 1.5 and 2.0. The tube bank consisting of 12 rows and 3 tubes per row in equilateral triangular arrangement with a transverse pitch to diameter ratio, a = 2. The results obtained were compared to the experimental data of Seri et al. (2014). It is observed that the addition of the integral wake splitter reduces the overall pressure drop.

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Numerical Simulation of Low Reynolds Number Flows in In-Line Tube Banks

Cited by 3 publications

References 12 publications

Numerical simulation of cross-flow in a bank of tubes with three rows in the subcritical region of Reynolds

Numerical simulation of cross-flow in a bank of tubes with three rows in the subcritical region of Reynolds

Tube Bank with Integral Wake Splitter Performance at Reynolds Number 5000 to 50000

Hydrodynamic Characteristics of Flow around Tube Bank with Integral Wake Splitter

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