Bumrungthaichaichan, Eakarach

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Bumrungthaichaichan, Eakarach
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eakarach.bu@kmitl.ac.th

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    Influence of jet discharge velocity profile on CFD simulation of pump-around jet mixing tank
    (2018-08-14)
    Jorakit, Thanwa
    ;
    Phaiboonsilpa, Natthanon
    ;
    Namkanisorn, Apinan
    ;
    Ponpo, Phisan
    ;
    Bumrungthaichaichan, Eakarach
    The present paper shows the effect of jet discharge velocity profile (or jet nozzle configuration) on CFD simulation of an open 45° inclined side entry pump-around jet mixing tank. The CFD model was carefully developed by using appropriate grid arrangement, boundary conditions, and numerical methods. The two different jet discharge velocity profiles, including top hat and fully developed profiles, were simulated by using the inlet mass flow rate of about 0.22 kg·s<sup>-1</sup>. The overall mixing times and normalized concentration profiles predicted by two different jet discharge velocity profiles were compared with the previous reliable experimental data. The results revealed that the different jet discharge velocity profiles resulted in different jet flow and mixing patterns inside the vessels.
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    A suitable k-epsilon model for CFD simulation of pump-around jet mixing tank with moderate jet reynolds number
    (2018-08-14)
    Phapatarinan, Satapan
    ;
    Bumrungthaichaichan, Eakarach
    ;
    Wattananusorn, Santi
    This paper presents the appropriate turbulence model for predicting the overall mixing time inside an open 45° inclined side entry pump-around jet mixing tank with moderate jet Reynolds number of about 17,515. The model was carefully developed by using appropriate hexahedral grid arrangement and proper numerical methods. The two different k-epsilon turbulence models, including realizable k-epsilon model and low Reynolds number k-epsilon model, were simulated. The overall mixing times predicted by these turbulence models were compared with the previous data reported by Patwardhan (Chem. Eng. Sci. 57 (2002) 1307-1318). The results revealed that the low Reynolds number k-epsilon model was a suitable model for predicting the overall mixing time of jet mixing tank with moderate jet Reynolds number.
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    Influence of grid distribution on CFD model of compressible flow inside the primary nozzle and mixing chamber used in refrigeration application
    (2018-08-14)
    Ruangtrakoon, Natthawut
    ;
    Bumrungthaichaichan, Eakarach
    In this study, the influence of grid distribution on CFD model of the primary nozzle and mixing chamber used in refrigeration application was primarily investigated. The only one geometry of primary nozzle and mixing chamber was modeled. The two different grid distributions, fine near-wall grid and regular grid with the identical total grid number, were simulated to investigate the flow phenomena inside the considered system. The appropriate boundary conditions and numerical methods were carefully employed. The simulated entrainment ratios obtained by two different grid arrangements were validated by comparing with the reliable experimental data. The results revealed that the Mach number distributions of these models were different. Further, the outlet total pressure predicted by fine near-wall grid was about 1.3% higher than that obtained by regular grid.