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Effect of blockage ratio on pressure drag and heat transfer of a cam-shaped tube

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Abstract

An experimental investigation has been conducted to clarify the effects of blockage ratio on forced convective heat transfer and pressure drag of an isothermal cam-shaped tube in cross-flow of air. The blockage ratio varies between 1.5 ≤ H/Deq ≤ 7 and Reynolds number based on equivalent diameter varies in range of 7.5 × 103 to 17.5 × 103. Results show that by increasing blockage ratio from 1.5 to 7, drag coefficient of the cam-shaped tube decreases about 55 % and increasing Reynolds number from 7.5 × 103 to 17.5 × 103 results in 40–48 % increment in Nusselt number. For better comparison, ratio of pressure drag over heat transfer of cam-shaped tube is compared with circular tube. In all ranges of Reynolds number and blockage ratios, thermal–hydraulic of cam-shaped tube is about 40–171 % greater than circular tube.

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Abbreviations

BR :

Blockage ratio, H/Deq

C D :

Drag coefficient

C P :

Pressure coefficient

d :

Small diameter (m)

D :

Large diameter (m)

D eq :

Equivalent diameter, P/π (m)

H :

Distance between upper and lower plate (m)

L :

Tube length (m)

l :

Distance between centers (m)

P :

Pressure (Pa), circumferential length (m)

Re :

Reynolds number, U∞Deq/υ

Nu :

Nusselt Number

T :

Temperature (K)

U :

Velocity (m/s)

Ρ :

Density (kg m−3)

υ:

Fluid kinematic viscosity (m2 s−1)

θ :

Hole Angle (°)

Cam:

Cam-shaped tube

Eq :

Equivalent

I :

Inlet

O :

Outlet

S :

Surface

W :

Water

Ave.:

Average

∞:

Free stream

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Authors and Affiliations

  1. Department of Mechanical Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran

    Arash Mirabdolah Lavasani

  2. Young Researchers and Elite Club, Central Tehran Branch, Islamic Azad University, Tehran, Iran

    Taher Maarefdoost & Hamidreza Bayat

Authors
  1. Arash Mirabdolah Lavasani
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  2. Taher Maarefdoost
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  3. Hamidreza Bayat
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Corresponding author

Correspondence to Arash Mirabdolah Lavasani.

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Lavasani, A.M., Maarefdoost, T. & Bayat, H. Effect of blockage ratio on pressure drag and heat transfer of a cam-shaped tube. Heat Mass Transfer 52, 1935–1942 (2016). https://doi.org/10.1007/s00231-015-1711-3

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  • DOI: https://doi.org/10.1007/s00231-015-1711-3

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