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Characterization of the Fluid-dynamic Mixing of a Bottom Gas- injected Channel Reactor Using Low-temperature Modelling.
M s Thesis Univ Mo--Rolla Missouri,:118 pages
This report describes a study on variables influencing the mixing in a single-phase (30.5 X 60 x 606 cm) and a two-phse (20 x 40 x 200 cm) channel reactor model. Tracer and/or neutral density particle techniques were used to determine an eddy diffusivity, de, for the system(s). Three bubbler arrangements were investigated in the one- phase work. A separate apparatus was developed to withstand the corrosiveness of the tetrachloroethylene used in the two-phase work. Both the electrical conductivity tracer technique and the neutral density particle technique were shown to be feasible experimental techniques for determining an eddy diffusivity in the systems studied. Decreasing liquid depth or gas flow rate decreased the mixing in the systems. The bubble wall bubbler arrangement yielded higher de values and the central linear bubbler arrangement yielded lower values, relative to the single central bubbler arrangement. This was attributed to the directionality of the non-turbulent portion of the mixing energy. In the two-phase work, an upper phase was shown to decrease the mixing in the lower phase. Also, mixing in the upper phase was also lower than that expected, probably due to a more random mixing in this phase which resulted from surface energy effects on the gas phase at the liquid-liquid interface.
IH; Final Contract Report;
M.s. Thesis, Univ. Mo--Rolla, Mo