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Effect of attack and cone angels on air flow characteristics for staggered wing shaped tubes bundle

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Abstract

An experimental and numerical study has been conducted to clarify fluid flow characteristics and pressure drop distributions of a cross-flow heat exchanger employing staggered wing-shaped tubes at different angels of attack. The water-side Rew and the air-side Rea were at 5 × 102 and at from 1.8 × 103 to 9.7 × 103, respectively. Three cases of the tubes arrangements with various angles of attack, row angles of attack and 90° cone angles were employed at the considered Rea range. Correlation of pressure drop coefficient Pdc in terms of Rea, design parameters for the studied cases were presented. The flow pattern around the staggered wing-shaped tubes bundle were predicted using the commercial CFD FLUENT 6.3.26 software package. Results indicated that the values of Pdc increased with the angle of attack from 0° to 45°, while the opposite was true for angles of attack from 135° to 180°. The values of Pdc for the arrangements of (θ1,2,3 = 45°), (θ1 = 45°, θ2 = 0°, θ3 = 45°), and (θ1,2,3 = 0°) were lower than those for the arrangement of (ϕ1 = ϕ2 = ϕ3 = 90°) by about 33, 53, and 91 %, respectively. Comparisons between the experimental and numerical results of the present study and those obtained by similar previous studies showed good agreements.

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Abbreviations

Deq :

Equivalent circular diameter, m

Pdc :

Pressure drop coefficient, (2 ∆Pa)/(ρaf V 2a )

Pr:

Prandtl number, (μ cp)/k

R2 :

Coefficient of determination ranged from 0 to 1

Re:

Reynolds number, (ρ V Deq)/μ

T:

Temperature, K

V:

Velocity, m/s

m:

Mass flow rate, kg/s

t:

Tube thickness, m

x:

Axial coordinate

y:

The normal distance to the tube surface

y+ :

Dimensionless normal distance to the tube surface

μ:

Absolute viscosity, Pa s

ρ:

Density, kg/m3

θ:

Angle of attack, °

θi :

Row angle of attack, °

ϕi :

The cone angle, °

∆hdyn :

Dynamic head difference, m H2O

∆Pa :

Pressure drop across the bundle, Pa

a:

Air

c:

Circular

e:

Exit

f:

Film

i:

Inlet, or row number

o:

Outer or outlet

w:

Water

RNG:

Reynolds normalized group

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Authors and Affiliations

  1. Mechanical Power Engineering Department, Faculty of Engineering, Zagazig University, Zagazig, Egypt

    Sayed E. Sayed Ahmed, Emad Z. Ibrahiem, Osama M. Mesalhy & Mohamed A. Abdelatief

Authors
  1. Sayed E. Sayed Ahmed
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  2. Emad Z. Ibrahiem
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  3. Osama M. Mesalhy
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  4. Mohamed A. Abdelatief
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Corresponding author

Correspondence to Mohamed A. Abdelatief.

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Sayed Ahmed, S.E., Ibrahiem, E.Z., Mesalhy, O.M. et al. Effect of attack and cone angels on air flow characteristics for staggered wing shaped tubes bundle. Heat Mass Transfer 51, 1001–1016 (2015). https://doi.org/10.1007/s00231-014-1473-3

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  • DOI: https://doi.org/10.1007/s00231-014-1473-3

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