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Experimental examination of the cooling performance of a cylindrical microchannel heat sink with straight and sinusoidal fins and alumina nanofluid coolant

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Abstract

Miniaturization of the electronic devices and dissipation of the heat generated during the operations within such equipment are of the most important issues in the design of these components. In the current experimental study, it is shown that deploying a cylindrical microchannel heat sink (CMHS) results in a superior efficiency for cooling the equipment when sinusoidally wavy fins are applied with an innovative structure in its geometry rather than the straight ones. The heat sinks considered include 80 straight/wavy microchannels with hydraulic radius of 589 μm and fins of 600 μm in both width and height located on a cylinder. In order to further enhance the heat transfer, alumina nanoparticles were used at three different concentrations, namely 0, 0.1, and 0.3 mass%. In the experiments performed using the base fluid, it is demonstrated that with increase in the Reynolds number in the range of 200–1000, the Nusselt number of the sinusoidal microchannels rises by 6–40% in comparison with that of straight microchannels. In addition, the use of the nanofluid instead of the base fluid further improves the heat transfer coefficient in the both cylindrical microchannels with straight and sinusoidal fins, such that an increase in the concentration of the nanofluid enhances the Nusselt number accordingly. Comparison between the thermal performance of the sinusoidal wavy fins to that of the straight ones in the same conditions (the size and geometry of the heat sink) illustrates that greatly improved thermal performance is achieved utilizing the sinusoidal fins. Also, the application of alumina nanofluids improves the thermo-hydraulic performance index (THPI) of the straight and the wavy CMHSs. The performance index range of 1.05–1.07 and 0.82–1.07 was obtained, respectively, for the 0.3 mass% nanofluid flow in the straight and wavy CMHSs.

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Abbreviations

\(CMHS\) :

Cylindrical microchannel heat sink

\(MHS\) :

Microchannel heat sink

R :

Thermal resistance (KW-1)

k :

Thermal conductivity (W m−1K−1)

A :

Area (m2)

q :

Heat transfer rate (W)

q″ :

Heat flux (W m−2)

N :

Number of microchannels

SH :

Shape factor

T :

Temperature (K)

P :

Pressure (mbar)

P P :

Pumping power (W)

H :

Height (m)

W :

Width (m)

Re :

Reynolds number

h :

Convective heat transfer coefficient (W m−2K−1)

Nu :

Nusselt number

z :

Z, Axial distance from the module inlet (m)

l′ :

L′, Microchannel curve length (m)

a w :

Fin cross-section aspect ratio

Q :

Volume flow rate (m3 s−1)

u :

Velocity (m s−1)

C p :

Specific heat at constant pressure (J kg−1 K−1)

THPI :

Thermo-Hydraulic Performance Index

\(\lambda\) :

Wavelength

γ :

Waviness aspect ratio

δ :

Half of wave amplitude

\(\varphi\) :

Volumetric fraction of the nanoparticles

ρ :

Density (kg m−3)

μ :

Viscosity (kg m−1s−1)

η :

Fin efficiency

ξ :

Coefficient of abrupt contraction/expansion

nf :

Nanofluid

f :

Fluid

p :

Particle

in :

Inlet

out :

Outlet

m :

Mean

th :

Thermocouple

conv :

Convective

fin :

Fin

ch :

Channel

s :

Substrate

mb :

Mean bulk

cond :

Conduction

w :

Wall

av :

Average

cc :

Center-to-center of channel

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Acknowledgements

Authors would like to appreciate the South Pars Gas Complex (SPGC) for their financial support of this research.

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Authors and Affiliations

  1. Chemical Engineering Department, School of Chemical and Petroleum Engineering, Shiraz University, 71345, Shiraz, Iran

    Abdonnabi Goosheneshin, Abdolmohammad Alamdari & Payam Setoodeh

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  1. Abdonnabi Goosheneshin
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  3. Payam Setoodeh
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Correspondence to Abdolmohammad Alamdari or Payam Setoodeh.

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Goosheneshin, A., Alamdari, A. & Setoodeh, P. Experimental examination of the cooling performance of a cylindrical microchannel heat sink with straight and sinusoidal fins and alumina nanofluid coolant. J Therm Anal Calorim 147, 7573–7588 (2022). https://doi.org/10.1007/s10973-021-11039-z

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