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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DOI: https://doi.org/10.1007/s00231-018-2398-z