Koefisien perpindahan massa antara tumpukan butiran dan cairan yang mengalir di antaranya=1984Mass Transfer Coefficient between Fixed Bed of Solid and LiquidFlowing Trough the Voids of the Bed

Mass transfer coefficients between fixed bed of solid and liquid flowing through the voids of the bed are important topics in Chemical Engineering, since they are needed in calculations of many prorP-sses. Cylindrical benzoic acid solids and water which flows in turbulent condition were used in this study. The diameter of the bed was relatively small, so that the ratio of A/D p has a considerable effect. The liquid flowed through the bed of benzoic acid which was placed in\u27 a glass tube, and the effluent was recirculated. The concentration of the benzoic acid in the solution entering the bed was measured with a conductometer, which was connected to a recorder. The experiments were conducted at various values of the variable. From the experimental data and the mathematical model setup, the values of the mass transfer coefficientc could be calculated. The relation between the mass transfer coefficient and its controlling factors was expressed in the form of a dimensionaless groups\u27 relation. Furthermore, an analogy between the mass transfer equation obtained and the momentum transfer equation from the literature was developed, and it turned out that the J factor obtained was equal to one fourteenth of the friction factor. Key words: mass transfer coefficient -- fixed bed of solid -- simulation -- mass and momentum transfer analogy -- numerical solution of a partial differential equation