DESIGNING A MORE EFFECTIVE FINNED AUTOMOTIVE RADIATOR COOLING PROCESS USING CARBON NANOTUBE-WATER NANOFLUID TURBULENT FLOW
Keywords:
Radiator cooling, carbon nanotube, fin, nanofluidAbstract
The Heat removal from coolant flowing through the automobile radiator is important for optimization of fuel consumption. Increase in engine cooling, reduction of area in the automotive frontal zone and reduction of the pumping power need are computed. Results for water have been benchmarked using recent experimental data. For Carbon Nanotube-water nanofluid, an increase in Nusselt number is shown with increasing nanoparticle volumetric concentration (0-1%), inlet radiator temperature and coolant flow rate within Re 5,000 to 25,000. The highest cooling performance is 116% with performance indices always of one or higher. The engine heat drops by 61.2% when a 75% reduction in radiator length is arrived at by ANSYS FLUENT 2D analysis under turbulent flow conditions. By changing the number of fins per row, fin spacing and fin height, the heat transfer performance of the proposed compact designs was improved to the level of current design. An increase in particle volumetric concentration of the nanofluid and flow rate results in radiator pressure loss increase. The required pumping power weakens by a decrease in volumetric flow needed to maintain the heat transfer. This allows a reduction in size and weight of the automotive radiator without altering the heat transfer performance. The contour plots for the velocity, temperature and pressure distributions in the flow domain are represented graphically. The additional heat removing rate obtained for the best cooling performance is presented. The results obtained in this study suggest optimum data specifications for the tubes and fins of the radiator design.
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