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Enhancement of the forced convective heat transfer on mini pin fin heat sinks with micro spiral fins

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Abstract

This research is an experimental study on the characteristics of heat transfer and pressure drop in mini heat sinks using air as the working fluid. The experiments were performed under a constant heat flux ranging from 9.132–13.698 kW/m2 and the air Reynolds number range 322–1982. Three different types of mini heat sinks were rectangle pin fins, cylindrical pin fins, and spiral pin fins with 36x28x9 mm and 5 mm fins high. There were 63 fins altogether and all were made of aluminum. The results showed that the characteristics of the temperature of heat sink of spiral pin fins was the least. Meanwhile the average heat transfer coefficient and Nusselt number of spiral pin fins were the most. Regarding the pressure drop, the rectangular pin fins was the least. The results of this study can be used to guide the design and development of electronic devices cooling system with forced convective heat transfer for higher performance in the future.

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Abbreviations

A :

area

Cp :

specific heat, kJ/(kg °C)

Dh :

hydraulic diameter, m

I :

current, amp

h :

heat transfer coefficient, kW/(m2 °C)

k :

thermal conductivity, kW/(m °C)

m :

mass flow rate, kg/s

Nu :

Nusselt number

∆P :

pressure drop, kPa

Pr :

Prandtl number

P :

wet perimeter, m

Q :

heat transfer rate, kW

Re :

Reynolds number

T :

temperature, °C

u :

velocity, m/s

V :

voltage, volt

ρ :

density, kg/m3

a :

air

ave. :

average

in :

inlet

out :

outlet

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Acknowledgements

The authors would like to express their appreciation to the Rajamangala University of Technology Isan Sakonnakhon (RMUTI-SKC) for providing financial support for this study.

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  1. Department of Mechanical Engineering, Rajamangala University of Technology Isan Sakonnakhon, 199 Phangkhon-varitchaphum Rd., Phangkhon, Sakonnakhon, 47160, Thailand

    Osot Khonsue

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Correspondence to Osot Khonsue.

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Khonsue, O. Enhancement of the forced convective heat transfer on mini pin fin heat sinks with micro spiral fins. Heat Mass Transfer 54, 563–570 (2018). https://doi.org/10.1007/s00231-017-2159-4

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  • DOI: https://doi.org/10.1007/s00231-017-2159-4

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