Study On The Flow And Heat Transfer Performance Of The Oil Cooler Fin

In the 21 st century,with the high speed of the development of the national automobile industry,automobile product replacement rate is also growing fast,thus requiring shorter design development cycle,traditional design method can no longer satisfy the quickly responding requirement of the market.The finite element numerical simulation based on finite element theory technology used in the automotive industry in place of the traditional test method,more and more mature.With the continuous improvement of the power of the automobile engine,the arrangement of the parts in the engine compartment is compact,and the lubricating oil temperature of the engine increases gradually.Because of the advantages of compact structure,high heat transfer efficiency and less power consumption,the application of the water cooled oil cooler has been widely used in modern automobiles.In this paper,the heat transfer mechanism is analyzed of the offset strip fin oil cooler.The main research work of this paper include the following aspects: based on the Navier-Stokes equation simulated the effect of collecting slot width on flow and heat transfer of fin layer of water-cooled oil cooler with inlet and outside on the same side;then verify whether the changed structure satisfy the blasting and fatigue property to meet actual needs;finally added aluminium oxide nanoparticles in the coolant to improve the heat transfer performance of the fin.The results show that as width of collecting slot increases,the area of flow dead zone in the fin layer falls down,heat transfer between coolant and fin gets stronger and coolant temperature in high temperature zone of fin layer reduces.As for the performance of fin layer,as the width of collecting slot increases,the pressure drop between coolant inlet and its outlet gradually goes down,and the area-weighted convective heat transfer coefficient gets bigger and bigger.Moreover,with the collecting slot width increasing,the ratio of heat transfer factor j and friction factor f increases,which means the overall performance of fin layer gets stronger and stronger.On the other hand,the changed structure satisfy the blasting and fatigue property,and the heat transfer performance of the cooling side has been significantly improved because the addition of nanoparticles.