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A Catalyst convertor has maximal efficiency when it reaches working  temperature. In a cold start phase efficiency of the catalyst is low and  exhaust emissions have high level of air pollutants. The exhaust system  optimization, in order to decrease time of achievement of the catalyst  working temperature, caused reduction of the total vehicle emission.  Implementation of mathematical models in development of exhaust systems  decrease total costs and reduce time. Mathematical model has to be  experimentally verified and calibrated, in order to be useful in the  optimization process. Measurement installations have been developed and used  for verification of the mathematical model of unsteady heat transfer in  exhaust systems. Comparisons between experimental results and the  mathematical model are presented in this paper. Based on obtained results, it  can be concluded that there is a good agreement between the model and the  experimental results

Experimental verification of mathematical model of the heat transfer in exhaust system