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Numerical and experimental study of cellular structures as a heat dissipation media

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Abstract

High heat flux generation in electronic devices demands new modes, methods and structures to dissipate heat effectively. We investigate the thermal performance of cellular structures using computational fluid dynamics (CFD) and obtained an optimal cellular structure for effective heat dissipation. Then, we validate our numerical results with experimental results obtained using optimized cellular structure. We found the minimum base temperature for the optimized cellular structure to be 43.6 °C and 47.4 °C numerically and experimentally respectively at inlet velocity of 10 m/s. We carried out experiments and simulations at the heat flux of 35,503 W/m2. We found a close agreement between numerical and experimental results with an error of 8.71% for the base temperature. Previously the best base temperatures were reported to be 55 °C and 40.5 °C using air and water respectively [1, 2].

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Abbreviations

Ab :

Frontal blocked area (m2)

At :

Frontal total area (m2)

As :

Surface Area (m2)

b:

Length of square side (mm)

c:

Centre to centre distance (mm)

Cp :

Specific heat (kJ/kgK)

d:

Bore diameter (mm)

dh :

Hole diameter (mm)

H:

Height (mm)

Kcell :

Pressure loss coefficient

L:

Length (mm)

ṁ:

Mass flow rate (kg/s).

ΔP:

Pressure Difference (Pa).

p:

Pressure (Pa)

Q̇:

Heat transfer rate (W)

RBR :

Blockage ratio

ROPEN :

Open area ratio

T:

Temperature (°C)

Tb :

Base temperature (°C)

Ti :

Inlet Temperature of air (°C)

To :

Outlet Temperature of air (°C)

t:

Wall thickness (mm)

u:

Velocity in x (m/s)

vi :

Inlet velocity (m/s)

vo :

Outlet velocity (m/s)

V:

Volume of the structure (m3)

Vb :

Total volume of whole solid block (m3)

W:

Width (mm)

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Authors and Affiliations

  1. Department of Mechanical Engineering, Institute of Space Technology, Islamabad, Pakistan

    Hussain Ahmed Tariq, Asif Israr & Muhammad Anwar

  2. School of Computing, Electronics and Maths, Coventry University, Coventry, UK

    Yasir Imtiaz Khan

  3. Faculty of Science, University of Nottingham, Nottingham, UK

    Muhammad Anwar

Authors
  1. Hussain Ahmed Tariq
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  2. Asif Israr
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  4. Muhammad Anwar
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Correspondence to Hussain Ahmed Tariq.

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Tariq, H.A., Israr, A., Khan, Y.I. et al. Numerical and experimental study of cellular structures as a heat dissipation media. Heat Mass Transfer 55, 501–511 (2019). https://doi.org/10.1007/s00231-018-2439-7

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