COOLING EFFECT ENHANCEMENT OF AUTOMOBILE RADIATOR USING NANOFLUID: A REVIEW

Heat and Power Engineering

Radiators also known as compact heat exchanger are classified as plate fin or tube fin heat exchangers. These heat exchangers can provide higher heat transfer coefficient in laminar flow than that offered by a highly turbulent flow in a plain tube situation. Experiments prove that by reducing the coolant flow rate, the time taken for the coolant to absorb heat from engine block and release it in the radiator will be expanded. Then the differential between temperature in and temperature out from the radiator will be at the highest stage. As the result, the heat dissipation from the radiator will be at the maximum point. Many researchers have extensively investigated heat transfer enhancement by the various enhancement techniques, some of them had carried test using nanofluids in water. Nanofluids possess high specific surface area and therefore more heat transfer surface between particles and fluids, high dispersion stability with predominant Brownian motion of particles, reduced pumping power as compared to pure liquid to achieve equivalent heat transfer augmentation, reduced particle clogging as compared to convention slurries, thus promoting system miniaturization, adjustable properties, including thermal conductivity and surface wet ability, by varying particle concentrations to suit different applications.

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