Abstract
In present investigation, a 3D numerical simulation of a baffle-cut heat exchanger of exhaust gas recirculation (EGR) in diesel engine is used to investigate its flow field and heat transfer characteristics at three different part loads. Firstly, an original shell-and-tube heat exchanger with different EGR rates is simulated as reference for latter comparisons. Then, some baffle-cut heat exchanger models with differently adjacent baffles cut in every model but same overall baffle cuts are made. Afterwards, these new ones are simulated with same conditions of original one to facilitate comparisons. The Nu/Pp is the ratio of Nu to pump power. It’s taken as one evaluation criterion to indicate comprehensive performance enhancement of new models which is increased with the increase of EGR rates and higher than original one.
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