Temperatures of an automotive catalyst substrate warmed by convection pre-light-off have been measured. Direct comparison has been made of warm-up by steady and pulsating flow for a one-dimensional flow case. The 32 Hz pulsating mass flow did not feature flow reversal. Pulsations were achieved by interruption of the airflow by a rotating disc. Very small differences between steady and pulsating cases were observed because the effect of mass flow pulsations on heat transfer is minimal. Two different computational fluid dynamics methods were used to predict temperature. A one-dimensional porous medium model, which required input of an assumed heat transfer coefficient, was compared with a single-channel model. Predictions agreed closely and there was also qualitative agreement with measurements. Similar mass flow pulsations in the range 32-100 Hz have been studied for a case with a larger diameter automotive catalyst supplied via a conical diffuser. The radial flow distribution is controlled by pulsation frequency and the effect of frequency on temperature at different depths in the substrate was observed experimentally. Pulsations will affect catalyst warm-up in practical systems because of their effect on flow distribution, rather than on heat transfer.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Warming automotive catalysts with pulsating flows


    Contributors:


    Publication date :

    2001-08-01


    Size :

    20 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Warming automotive catalysts with pulsating flows

    Benjamin,S.F. / Roberts,C.A. / Coventry Univ.,GB | Automotive engineering | 2001


    Warming automotive catalysts with pulsating flows

    Benjamin, S.F. | Online Contents | 2001



    Pulsating Heat Pipe Automotive Application

    Windlin, Fernando Luiz / Alegre, Guilherme Henrique Mayer / Filho, Luiz Paulo Rodrigues et al. | SAE Technical Papers | 2020


    Fully developed pulsating turbulent flows

    MANKBADI, REDA | AIAA | 1988