Abstract

Three-dimensional k-e turbulence model,block-structured grid system,and fluid-solid coupling study method combined with shell conduction model were adopted to simulate the nanofluid flow and heat transfer performance under high temperature cooling condition. The nanofluid γ-Al2O3-PG90 was used as cooling medium in a vehicular oil cooler. Performance comparative analysis between baseliquid and nanofluid was carried out and the effect of nanoparticle volume fraction on the performance was investigated. Simultaneously,the universal applicability of the nanofluid property prediction model and the feasibility of regarding nanofluid as single phase fluid to study the performance were analyzed. Performance test-rig was set up to obtain test data. Nanofluid can improve the heat transfer,contrasted with baseliquid,and the flow resistance increases slightly. Heat transfer is improved and the flow resistance increases with the increasing nanoparticle volume fraction. The property prediction model is not universal applicability and it is not feasible to regard nanofluid as single phase fluid to study the performance when the nanoparticle volume fraction is higher than 3%. The possible reason maybe that the single fluid flow cannot reflect the interaction of more nanoparticles.

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