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A comparison of the thermal and hydraulic performances between miniature pin fin heat sink and microchannel heat sink with zigzag flow channel together with using nanofluids

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Abstract

In this study, a comparison of the convective heat transfer, pressure drop, and performance index characteristics of heat sinks with a miniature circular pin-fin inline arrangement (MCFHS) and a zigzag flow channel with single cross-cut structures (CCZ-HS) is presented. SiO2-water nanofluids with different particle concentrations are used as the coolant. The effects of the heat sink type, particle concentration and fluid flow rate on the thermal and hydraulic performances are evaluated. The testing conditions are performed at the wall heat fluxes of 10 to 60 kW/m2 and at a mass flow rate ranging from 0.18 to 0.6 kg/s. The dimension of heat sinks is equally designed at 28 × 33 mm. The heat transfer area of MCFHS and of CCZ-HS is 1430 and 1238 mm2, respectively. Similarly, the hydraulic diameter of the flow channel of MCFHS and of CCZ-HS is 1.2 and 1.0 mm, respectively. The measured data indicate that the cooling performances of CCZ-HS are about 24–55% greater than that of MCFHS. The effects of the channel diameter and single cross-cut of the flow channel are more dominant than the effects of the fin structure and heat transfer area.

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Abbreviations

A:

Area, m2

Cp :

Specific heat, J/kgK

d:

Diameter, m

h:

Heat transfer coefficient, W/m2 °C

k:

Thermal conductivity, W/m °C

L:

Heat sink length, m

m :

Mass flow rate, kg/s

Nu :

Nusselt number

ΔP:

Pressure drop, Pa

Q:

Heat transfer rate, W

R:

Thermal resistance, °C/W

Re:

Reynolds number

T:

Temperature, °C

t:

Fin height, mm

V:

Mean velocity, m/s

Q v :

Volume flow rate, m3/s

W:

Heat sink width, mm

W p p :

Pumping power, W

ϕ :

Volume fraction

ρ :

Density, kg/m3

μ :

Viscosity, kg/ms

η :

Performance index

b:

Bulk

ch:

Channel

in:

Inlet

out:

Outlet

p:

Particles

PF:

Pin fin

nf:

Nanofluid

S:

Surface

th:

Thermal

w:

Water

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Acknowledgments

The first author would like to thank the office of research of the Southeast Asia University (SAU) and the Thailand Research Fund (TRF). The second author acknowledges the support provided by the “Research Chair Grant” National Science and Technology Development Agency (NSTDA), and King Mongkut’s University of Technology Thonburi through the “KMUTT 55th Anniversary Commemorative Fund”.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Faculty of Engineering, Southeast Asia University, Bangkok, Thailand

    Weerapun Duangthongsuk

  2. Fluid Mechanics, Thermal Engineering and Multiphase Flow Research Lab. (FUTURE), Department of Mechanical Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Bangmod, Bangkok, Thailand

    Weerapun Duangthongsuk & Somchai Wongwises

  3. The Academy of Science, The Royal Institute of Thailand, Sanam Suea Pa, Dusit, Bangkok, 10300, Thailand

    Somchai Wongwises

Authors
  1. Weerapun Duangthongsuk
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  2. Somchai Wongwises
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Correspondence to Somchai Wongwises.

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Duangthongsuk, W., Wongwises, S. A comparison of the thermal and hydraulic performances between miniature pin fin heat sink and microchannel heat sink with zigzag flow channel together with using nanofluids. Heat Mass Transfer 54, 3265–3274 (2018). https://doi.org/10.1007/s00231-018-2370-y

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  • DOI: https://doi.org/10.1007/s00231-018-2370-y

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