Heat Transfer Enhancement in a Double Pipe Heat Exchanger Using Different Fin Geometries in Turbulent Flow

Abstract

Heat transfer enhancement is widely used for improving heat exchanger performance in industrial processes. This is accomplished by increasing the surface area of the heat exchange surface by using fins or inserts of different geometries. The present work is an experimental study of heat transfer when using different fin geometries for the heat exchange surface in a double pipe heat exchanger. The fin geometries included interrupted rectangular fins, circular fins and helical ribs. The heat transfer coefficient and pressure drop were experimentally determined for a range of Reynolds numbers of hot and cold fluids. The results showed that extending the surface using different fin geometries enhanced the heat transfer coefficient, but was dependent on the Reynolds number of both fluids. The maximum heat transfer enhancement was obtained for a rectangular fin and the minimum was for a circular fin. In the case of the finned tubes, the lowest pressure drop was observed for the circular fin and highest for the rectangular fin.

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Abbreviations

p :

Pressure drop (N/m2)

A :

Area (m2)

C p :

Specific heat (J/kg K)

D :

Diameter (m)

f :

Friction factor

L :

Length (m)

m :

Mass flow rate (kg/s)

N :

Number of measurements

Q :

Heat transfer rate (W)

Re:

Reynolds number

s :

Standard deviation

T :

Temperature (K)

u :

Velocity (m/s)

U o :

Overall heat transfer coefficient based on outside area (W/m2 K)

x av :

Average value

x i :

Parameter’s value

c:

Cold

h:

Hot

H:

Hydrodynamic

ρ :

Density (kg/m3)

∆:

Difference

lm:

Log-mean

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Acknowledgements

Sincere thanks to Dr. Richard A. Craig/Australia, for providing editorial services for this paper.

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Correspondence to Basim O. Hasan.

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Mohsen, O.A., Muhammed, M.A.R. & Hasan, B.O. Heat Transfer Enhancement in a Double Pipe Heat Exchanger Using Different Fin Geometries in Turbulent Flow. Iran J Sci Technol Trans Mech Eng (2020). https://doi.org/10.1007/s40997-020-00377-2

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Keywords

  • Heat transfer
  • Fins
  • Turbulent flow
  • Double pipe
  • Pressure drop