Sulzer mixers SMV and SMX

The SMX mixing (Fig. 8.4c) element consists of a structure of opposing slanting beams, whose main axis is at right angles and at an angle to the pipe axis. These geometric conditions can be optimally adapted to any task. 

In Fig. 8.6, the variance coefficient of these mixers is plotted as a function of the I/D ratio for laminar flow and in Fig. 8.7 for turbulent flow. (This measure is invariant with respect to the sample size [101]). The numerical value behind the mixer type in these figures denotes the CfRe constant in expression (8.9). This representation shows, how the mixing length can be shortened by increasing the pressure drop Ap/y for a given degree of mixing. For details over the variance 

The liquid-side mass transfer of dissolved oxygen to small helium gas bubbles, which moved along in turbulent co-current flow with the liquid horizontal to and perpendicular to the flow, was investigated in [299]. 

Above Re s vD/v = 2 x 10 the turbulent inertial forces prevailed over the gravitational forces in the flow, in that approximately the same transport coefficient was found for both bubble movements  

The exponent of the Re number determined confirmed the results of other studies, but did not correspond with the expectation of its being in agreement with P/V in stirred vessels. Then the exponent would have been 0.67. 

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