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Experimental investigation on heat transfer characteristics of an oblique finned microchannel heat sink with different channel cross sections

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Abstract

The heat transfer and flow characteristics of oblique finned microchannel heat sink with a dimension of 48 × 80 mm2 were investigated experimentally with different channel cross-sections. The three-channel cross sections were namely trapezoidal, square and semi-circle is analyzed by using Al2O3/water nanofluid with 0.25% volume fraction and water as a coolant. The experiments were performed with a constant mass flow rate of 0.1 LPM and varying heat flux ranging from 5.5 to 26.5 kW/m2. The temperature and pressure drop across the inlet and outlet of the microchannel heat sink were measured to obtain heat and flow characteristics. The result shows that trapezoidal cross-section performs better and it provides 8.5 and 10.3% increased heat transfer rate than square and semi-circle cross sections respectively. Similarly, it gives 6.6 and 8.2% increase in friction factor than square and semi-circle respectively. Also, the case with trapezoidal cross-section creates lesser thermal resistance and slightly higher pumping power among the three sections.

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Abbreviations

D:

Diameter (m)

f:

Friction Factor

h:

Heat transfer coefficient(W/m2K)

k:

Thermal conductivity (W/mK)

L:

Length(m)

m:

Mass (kg)

Nu:

Nusselt number

P:

Pressure(Pa)

Q:

Heat transfer(kJ)

q′′:

Channel heat flux (W/m2)

R:

Thermal resistance (K/W)

T:

Temperature(K)

wg :

Uncertainty in the temperature gradient (°C/m)

Wti :

Uncertainty in temperature (°C)

yi :

Position of the ith thermocouple (m)

\( \overline{y} \) :

Average thermocouple position in measuring segment (m)

∆:

Difference

φ:

Volume concentration of nanofluid

ρ:

Density(kg/m3)

Ω:

Pumping power (W)

bf:

Base fluid

nf:

Nanofluid

in:

Inlet

out:

Outlet

p:

Particle

h:

Hydraulic

MCHS:

Microchannel heat sink

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Vinoth, R., Senthil Kumar, D. Experimental investigation on heat transfer characteristics of an oblique finned microchannel heat sink with different channel cross sections. Heat Mass Transfer 54, 3809–3817 (2018). https://doi.org/10.1007/s00231-018-2398-z

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