| For the automotive louvered fins heat exchangers, a series of three-dimensionnumerical simulations and wind tunnel experiments has been conducted for differentoperation conditions to obtain the heat transfer, flow resistance and overallperformance as well as the factor that influences performance of automotive heatexchangers. The obtained results have profound guiding significance and referencevalue for the optimization design and improvement of louvered fins heat exchangers.To simulate the operation conditions of the automotives, the numericalsimulation has been conducted for the performance of louvered fins heat exchangers.It shows that the air-side surface heat transfer coefficient and pressure drop improvesa lot with the improvement of air frontal velocity.The wind tunnel experimental platform has been designed, in which the heattransfer and flow resistance performance has been presented by fixing the conditionsof the cooling water side and changing the air frontal velocity and temperature for akind of commercial heat exchanger. On the basis of the wind tunnel experimentalresults, the established numerical model has been validated. From the wind tunnelexperimental results, it has been found that the heat transfer performance is differentfor different air frontal velocity and temperature. However, the flow resistanceperformance just depends on the flow regime and is independent of the air frontaltemperature.In this study, four kinds of basic types louvered fins of automotive heatexchangers have been established with the overall performance evaluation factor beenpresented. It shows that the configuration of louvers has dominant influence on theautomotive heat exchangers. Also, the fin pitch is a main influence for the heattransfer and flow resistance performance with few influences on the overallperformance. However, decreasing the fin length is beneficial for the improvement ofoverall performance for the louvered fins. |
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