Abstract
An experimental investigation was performed with the view to assess the heat transfer characteristics of a water-based nanofluid in a micro heat exchanger employed to quench a high heat flux heater for industrial and microelectronic cooling applications. The experiments were conducted at heat fluxes 10–70 kW/m2 and for nanofluids at various mass concentrations of 0.1–0.3% and passing flow rates of 0.1–5 l/min. Thermo-physical properties of the nanofluid including thermal conductivity, heat capacity, density and viscosity of nanofluid were experimentally measured at 40 °C close to the temperature of the experiments. Results showed that the heat transfer coefficient and pressure drop were augmented by 40.1% and 67% at wt% = 0.3 compared to the base fluid, respectively. The enhancement in the heat transfer coefficient was associated with the improvement in the thermal conductivity of the base fluid together with the intensification of Brownian motion and thermo-phoresis effect. The increase in the pressure drop was also attributed to the increase in the viscosity of the working fluid which induces layer–layer frictional forces in the bulk of the coolant in micro heat exchanger.
Highlights
Heat exchangers play a key role in cooling systems and power cycles thanks to their anomalous thermal features, contact surface area and the great heat transfer coefficient
The enhancement in the heat transfer coefficient can be attributed to the increase in the thermal conductivity and other physical properties of the nanofluid, which has been discussed in Sect
Experimental investigation was conducted on the potential of zirconia/water nanofluid to be utilised in a microchannel as a coolant and the following conclusions were made: 1. Results showed that with an increase in the applied heat flux to the microchannel, the heat transfer coefficient increased
Summary
Heat exchangers play a key role in cooling systems and power cycles thanks to their anomalous thermal features, contact surface area and the great heat transfer coefficient. The presence of these nanoparticles can intensify some thermo-physical properties of the nanofluids including thermal conductivity, heat capacity, and density.
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