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Numerical and experimental investigation of enhancement of heat transfer in dimpled rib heat exchanger tube

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Abstract

In this study, numerical and experimental investigation has been carried out for a range of system and operating parameters in order to analyse the effect of dimpled rib on heat and fluid flow behaviours in heat exchanger tube. Tube has, stream wise spacing (x/d d ) range of 15–35, span wise spacing (y/d d ) range of 15–35, ratio of dimpled depth to print diameter (e/d d ) of 1.0 and Reynolds number (Re n ) ranges from 4000 to 28,000. Simulations were carried out to obtain heat and fluid flow behaviour of smooth and rough tube, using commercial CFD software, ANSYS 16.0 (Fluent). Renormalization k − ε model was employed to assess the influence of dimpled on turbulent flow and velocity field. Simulation results show that, the enhancement of 3.18 times in heat transfer and 2.87 times enhancement in thermal hydraulic performance as a function of stream wise direction (x/d d ) of 15 and span wise direction (y/d d ) of 15 respectively. Comparison between numerical and experimental simulation results showed that good agreement as the data fell within ±10% error band.

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Abbreviations

d d :

Print diameter of dimple rib, m

D :

Hydraulic diameter, m

e :

Dimpled rib height, m

e/d d :

Ratio of dimple depth to print diameter

E :

Energy, J

f :

Friction factor

frs ave :

Average friction factor of rough wall

fss ave  :

Average friction factor of smooth wall

I :

Heat flux, W/m 2

k :

Turbulent kinetic energy, m 2/s 2

M t :

Turbulent Mach number

Nu :

Nusselt number

Nurs ave  :

Average Nusselt number of rough wall

Nuss ave  :

Average Nusselt number of smooth wall

p :

Pressure, Pa

Pr:

Prandtl number

Pr t :

Turbulent Prandtl number

Re n :

Reynolds number

u i :

Velocity in x i -direction, m/s

\( \overrightarrow{v} \) :

Overall velocity vector, m/s

x/d d :

Stream wise spacing

y/d d :

Span wise spacing

y + :

Dimensionless distance from walls

Δpave :

Average pressure drop across

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Authors and Affiliations

  1. School of Mechanical and Civil Engineering, Shoolini University, Solan, India

    Anil Kumar & Amar Raj Singh Suri

  2. Department of Mechanical Engineering, DIT, University, Dehradun, India

    Rajesh Maithani

Authors
  1. Anil Kumar
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  2. Rajesh Maithani
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  3. Amar Raj Singh Suri
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Correspondence to Anil Kumar.

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Kumar, A., Maithani, R. & Suri, A.R.S. Numerical and experimental investigation of enhancement of heat transfer in dimpled rib heat exchanger tube. Heat Mass Transfer 53, 3501–3516 (2017). https://doi.org/10.1007/s00231-017-2080-x

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