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Enhanced heat transfer in plate fin heat sink with dimples and protrusions

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Abstract

The heat transfer and flow performance of the plate fin heat sink in a horizontal rectangular channel with dimples and protrusions on the fin surfaces has been experimentally investigated in forced convection. The Nusselt number and friction factor are obtained by varying the system parameters as depth and pitch of the dimples for inline and staggered arrangements. The Reynolds number is considered in the range of 6800 to 15,200. The effect of depth and pitch of dimples are examined under constant heat flux while keeping the constant diameter of dimples. Experimental results indicate that the heat transfer and flow performance of fin array are significantly influenced by increasing the depth of dimples. The heat transfer from fin array is enhanced and the flow resistance is increased by decreasing the pitch ratio (s/d) and increasing the depth ratio (D/d). The maximum fin performance of dimpled fin heat sink corresponds to the staggered arrangement of dimpled heat sink with dimple pitch ratio (s/d) of 2.5 and dimple depth ratio (D/d) of 0.5.

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Abbreviations

A:

Area (m2)

Cp :

Specific heat of air (kJ/kgK)

Dh :

Hydraulic diameter (m)

f:

Fanning friction factor of dimpled plate fin heat sink

fs :

Fanning friction factor of smooth base without fins

H:

Height of duct (m)

L:

Length of duct (m)

Lt :

Length of test section (m)

Lp :

Distance between two pressure tapings (m)

Lb :

Length of base plate (m)

Hf :

Height of fin (m)

Pf :

Fin spacing (m)

d:

Diameter of dimple (m)

D:

Depth of dimple (m)

h:

Convective heat transfer coefficient (W/m2K)

k:

Thermal conductivity (W/mK)

q:

Convective heat transfer rate (W)

Q :

Total heat supply (W)

\( \dot{\mathrm{m}} \) :

Mass flow rate (kg/s)

Nu:

Nusselt number of dimpled plate fin heat sink

Nuo :

Nusselt number of plate fin heat sink

Nus :

Nusselt number of smooth base without fins

Re:

Reynolds number

∆P:

Pressure drop (Pa)

V:

Air velocity (m/s)

s:

Dimple pitch (m)

Ts :

Average surface temperature of base plate (K)

Tf :

Mean film temperature (K)

W:

Width of duct (m)

Wb :

Width of fin base (m)

ρ :

Density (kg/m3)

μ :

Dynamic viscosity (kg/m s)

o :

Outlet

i :

inlet

s :

Smooth plate

f :

Fin

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Authors and Affiliations

  1. Department of Mechanical Engineering, DIT University, Dehradun, Uttarakhand, 248009, India

    Ayush Gupta, Manoj Kumar & Anil Kumar Patil

Authors
  1. Ayush Gupta
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  2. Manoj Kumar
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  3. Anil Kumar Patil
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Correspondence to Anil Kumar Patil.

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Gupta, A., Kumar, M. & Patil, A.K. Enhanced heat transfer in plate fin heat sink with dimples and protrusions. Heat Mass Transfer 55, 2247–2260 (2019). https://doi.org/10.1007/s00231-019-02561-w

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