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Heat transfer enhancement in Minichannel heat sinks using fully and partially filled coiled wire inserts

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Abstract

Enhanced heat transfer through minichannel heat sink is beneficial for engineering uses such as air conditioning, cooling system, and heat retrieval processes. In the current study, the heat transfer and friction factor were experimentally measured in a rectangular minichannel heat sink with coiled wire inserts. These coiled wires exhibited two wire diameters (0.4, 0.6 mm) and three pitches (1.2, 2.4 and 3.6 mm). The air was used as the working fluid and the Reynolds number ranged from 3000 to 10,000 in the experiments. The minichannel was either fully or partially filled with coiled wires (upstream or downstream portion). Results indicated that the coiled wire inserts tended to increase heat transfer and friction factor in the channel. The Nusselt number and friction factor increased with wire diameter, but decreased with an increase in the pitch-to-diameter ratio. The partially filled design was proposed to reduce the pressure drop caused by the wire inserts. Compared to the fully filled design, the friction factors were lower and the heat transfer enhancement was still noticeable. The partially filled inserts was particularly useful for reducing pressure losses from the thicker wires. Consequently, the minichannel with partially-filled coiled wires lead to the highest thermal performance.

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Abbreviations

A :

Cross-sectional area of minichannel (m2)

A f :

Fin cross-sectional area (m2)

D h :

Hydraulic diameter of minichannel (m)

d:

Outer diameter of the coiled wire (m)

e:

Wire diameter (m)

f :

Friction factor

f o :

Friction factor for smooth channel

H ch :

Channel height (m)

H w2 :

Distance between thermocouple and channel wall (m)

h :

Heat transfer coefficient (W/m2∙K)

k a :

Air thermal conductivity (W/m∙K)

K c :

Contraction loss coefficient

K e :

Expansion loss coefficient

k s :

Copper thermal conductivity (W/m∙K)

L :

Length of minichannel (m)

m :

Fin coefficient

Nu :

Nusselt number

Nu o :

Nusselt number for smooth channel

P :

Pitch of the coiled wire (m)

p :

Fin perimeter (m)

ΔP e :

Pressure drop due to outlet expansion (Pa)

ΔP f :

Frictional pressure drop (Pa)

ΔP i :

Pressure drop due to inlet contraction (Pa)

ΔP mea :

Measured overall pressure drop (Pa)

q″ :

Input heat flux (W/m2)

q″ loss :

Heat loss (W/m2)

Re :

Reynolds number

T b :

Fluid bulk temperature (°C or K)

T w :

Wall temperature (°C or K)

T w1 :

Temperature inside copper block (°C or K)

V ch :

Flow velocity in minichannel (m/s)

W ch :

Channel width (m)

W w :

Half-width of fin (m)

x :

Streamwise distance (m)

η :

Thermal performance

η f :

Fin efficiency

ρ:

Air density (kg/m3)

ν :

Air kinematic viscosity (m2/s)

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Acknowledgements

This study was funded by the Ministry of Science and Technology, Taiwan, under contract MOST 104-2221-E-009-153.

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Authors and Affiliations

  1. Department of Mechanical Engineering, National Chiao Tung University, Hsinchu, Taiwan, 30010

    Iyyamperumal Seerangan, Ting-Hsuan Huang & Yao-Hsien Liu

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  1. Iyyamperumal Seerangan
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Correspondence to Yao-Hsien Liu.

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Seerangan, I., Huang, TH. & Liu, YH. Heat transfer enhancement in Minichannel heat sinks using fully and partially filled coiled wire inserts. Heat Mass Transfer 57, 1183–1192 (2021). https://doi.org/10.1007/s00231-021-03020-1

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  • DOI: https://doi.org/10.1007/s00231-021-03020-1

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