Namkanisorn, Apinan

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Namkanisorn, Apinan
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Email
apinan.na@kmitl.ac.th

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    Item type:Publication,
    Outer-tubes Falling Film Evaporator with Well-Mixed Surface Renewal
    (2017-01-01)
    Lerkkasemsan, Nuttapol
    ;
    Lerssubsuree, Kuntaphon
    ;
    Chotiviriyavanich, Boonchai
    ;
    Benjangkaprasert, Ruenruedee
    ;
    Kitchaiya, Prakob
    A falling film evaporator with a liquid flowing laminarly outside vertical cylindrical tubes was studied by a mathematical modeling in order to describe the performance of the system and the results are later used for a design of a falling film evaporator. In this study a mathematical model was developed from mass and energy as well as momentum transfer processes in an evaporation of a sugar solution. The equations were solved by using a numerical technique known as implicit method. This model yields the prediction of velocity, temperature and concentration profiles of solution as well as rate of mass evaporation and energy required in this process. Evaporation limitation was disclosed to be based on water mass transfer across the liquid thin film. Renewable surface was proposed to enhance the evaporation by adding a collector for liquid mixing before further evaporation. Adding only one collector at the half height of the evaporation tube could increase water evaporation rate by 1.3 and 2.1 % in case of the liquid perfect mixing, respectively.
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    CFD modelling of pump-around jet mixing tanks: a discrepancy in concentration profiles
    (2018-10-03)
    Bumrungthaichaichan, Eakarach
    ;
    Namkanisorn, Apinan
    ;
    Wattananusorn, Santi
    Jet mixing tanks are important in chemical processes. Over the past two decades or so, computational fluid dynamics (CFD) has been employed to study jet mixers. The shortfalls of the previous CFD models were the discrepancy in concentration profiles between simulation and experiment and the absence of exact inlet turbulence conditions. So, in our present work, the CFD model was developed to investigate the proper conditions for jet mixing tank simulation and improve the accuracy of concentration profile prediction by using an appropriate grid arrangement, a realizable k-epsilon model, and a second-order upwind discretization scheme. The results revealed that the CFD model with proper inlet conditions predicted the overall mixing time well and somewhat improved the predicted concentration profiles. Further, the reasons for discrepancies in concentration profiles were inappropriate inlet turbulence conditions and overprediction in total momentum available for mixing due to the flat top liquid surface assumption. In addition, this discrepancy may be caused by the dynamic response of concentration measuring device.
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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.